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pottlinger pushed a commit to branch master
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The following commit(s) were added to refs/heads/master by this push:
     new 46694d7  TAMAYA-216: Simplify assertj tests
     new bbaed0c  Merge pull request #28 from acoburn/TAMAYA-216
46694d7 is described below

commit 46694d7ad9abb7fa67708c0fe9bd37e6d8a65775
Author: Aaron Coburn <[email protected]>
AuthorDate: Thu Jan 24 11:26:29 2019 -0500

    TAMAYA-216: Simplify assertj tests
    
    This makes more idiomatic use of assertJ in the test code.
---
 .../collections/CollectionAdvancedTests.java       |  22 +--
 .../tamaya/collections/CollectionsBaseTests.java   | 160 ++++++++-------------
 .../collections/CollectionsTypedReadOnlyTests.java |  80 ++++-------
 .../tamaya/collections/CollectionsTypedTests.java  | 132 +++++------------
 .../org/apache/tamaya/consul/ConsulWriteTest.java  |   3 +-
 .../tamaya/events/ConfigurationChangeTest.java     |   9 +-
 .../tamaya/events/FrozenPropertySourceTest.java    |   6 +-
 .../tamaya/filter/ProgrammableFilterTest.java      |  18 +--
 .../functions/ConfigurationFunctionsTest.java      |   3 +-
 .../functions/PropertySourceFunctionsTest.java     |   3 +-
 .../hazelcast/AbstractHzPropertySourceTest.java    |   6 +-
 .../hazelcast/HazelcastPropertySourceTest.java     |  18 +--
 .../apache/tamaya/jndi/JNDIPropertySourceTest.java |  15 +-
 .../microprofile/MicroprofileConfigTest.java       |   3 +-
 .../tamaya/resolver/ConfigResolutionTest.java      |   9 +-
 .../AbstractPathPropertySourceProviderTest.java    |   2 +-
 16 files changed, 153 insertions(+), 336 deletions(-)

diff --git 
a/modules/collections/src/test/java/org/apache/tamaya/collections/CollectionAdvancedTests.java
 
b/modules/collections/src/test/java/org/apache/tamaya/collections/CollectionAdvancedTests.java
index ca7c18d..01016d5 100644
--- 
a/modules/collections/src/test/java/org/apache/tamaya/collections/CollectionAdvancedTests.java
+++ 
b/modules/collections/src/test/java/org/apache/tamaya/collections/CollectionAdvancedTests.java
@@ -45,12 +45,7 @@ public class CollectionAdvancedTests {
     public void testCustomSeparator(){
         Configuration config = Configuration.current();
         List<String> items = config.get("sep-list", new 
TypeLiteral<List<String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(3);
-        assertThat("a,b,c").isEqualTo(items.get(0));
-        assertThat("d,e,f").isEqualTo(items.get(1));
-        assertThat("g,h,i").isEqualTo(items.get(2));
+        
assertThat(items).isNotNull().isNotEmpty().hasSize(3).containsExactly("a,b,c", 
"d,e,f", "g,h,i");
     }
 
     /**
@@ -64,9 +59,7 @@ public class CollectionAdvancedTests {
     public void testTypedContent(){
         Configuration config = Configuration.current();
         List<Currency> items = config.get("currency-list", new 
TypeLiteral<List<Currency>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(3);
+        assertThat(items).isNotNull().isNotEmpty().hasSize(3);
         assertThat("CHF").isEqualTo(items.get(0).getCurrencyCode());
         assertThat("USD").isEqualTo(items.get(1).getCurrencyCode());
         assertThat("USS").isEqualTo(items.get(2).getCurrencyCode());
@@ -84,12 +77,7 @@ public class CollectionAdvancedTests {
     public void testCustomParser(){
         Configuration config = Configuration.current();
         List<String> items = config.get("parser-list", new 
TypeLiteral<List<String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(3);
-        assertThat("(A)").isEqualTo(items.get(0));
-        assertThat("(B)").isEqualTo(items.get(1));
-        assertThat("(C)").isEqualTo(items.get(2));
+        
assertThat(items).isNotNull().isNotEmpty().hasSize(3).containsExactly("(A)", 
"(B)", "(C)");
     }
 
     /**
@@ -104,9 +92,7 @@ public class CollectionAdvancedTests {
     public void testCustomMapParser(){
         Configuration config = Configuration.current();
         Map<String,String> items = config.get("redefined-map", Map.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(3);
+        assertThat(items).isNotNull().isNotEmpty().hasSize(3);
         assertThat("none").isEqualTo(items.get("0"));
         assertThat("single").isEqualTo(items.get("1"));
         assertThat("any").isEqualTo(items.get("2"));
diff --git 
a/modules/collections/src/test/java/org/apache/tamaya/collections/CollectionsBaseTests.java
 
b/modules/collections/src/test/java/org/apache/tamaya/collections/CollectionsBaseTests.java
index e88fca7..780b391 100644
--- 
a/modules/collections/src/test/java/org/apache/tamaya/collections/CollectionsBaseTests.java
+++ 
b/modules/collections/src/test/java/org/apache/tamaya/collections/CollectionsBaseTests.java
@@ -38,187 +38,139 @@ public class CollectionsBaseTests {
     public void testList_String(){
         Configuration config = Configuration.current();
         List<String> items = config.get("base.items", new 
TypeLiteral<List<String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
+        assertThat(items).isNotNull().isNotEmpty().hasSize(10);
         items = (List<String>) config.get("base.items", List.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
+        assertThat(items).isNotNull().isNotEmpty().hasSize(10);
     }
 
     @Test
     public void testArrayList_String(){
         Configuration config = Configuration.current();
         ArrayList<String> items = config.get("base.items", new 
TypeLiteral<ArrayList<String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
+        assertThat(items).isNotNull().isNotEmpty().hasSize(10);
         items = (ArrayList<String>) config.get("base.items", ArrayList.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
+        assertThat(items).isNotNull().isNotEmpty().hasSize(10);
     }
 
     @Test
     public void testLinkedList_String(){
         Configuration config = Configuration.current();
         LinkedList<String> items = config.get("base.items", new 
TypeLiteral<LinkedList<String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
+        assertThat(items).isNotNull().isNotEmpty().hasSize(10);
         items = (LinkedList<String>) config.get("base.items", 
LinkedList.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
+        assertThat(items).isNotNull().isNotEmpty().hasSize(10);
     }
 
     @Test
     public void testSet_String(){
         Configuration config = Configuration.current();
         Set<String> items = config.get("base.items", new 
TypeLiteral<Set<String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
+        assertThat(items).isNotNull().isNotEmpty().hasSize(10);
         items = (Set<String>) config.get("base.items", Set.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
+        assertThat(items).isNotNull().isNotEmpty().hasSize(10);
     }
 
     @Test
     public void testSortedSet_String(){
         Configuration config = Configuration.current();
         Set<String> items = config.get("base.items", new 
TypeLiteral<SortedSet<String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
+        assertThat(items).isNotNull().isNotEmpty().hasSize(10);
         items = (SortedSet<String>) config.get("base.items", SortedSet.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
+        assertThat(items).isNotNull().isNotEmpty().hasSize(10);
     }
 
     @Test
     public void testHashSet_String(){
         Configuration config = Configuration.current();
         Set<String> items = config.get("base.items", new 
TypeLiteral<HashSet<String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
+        assertThat(items).isNotNull().isNotEmpty().hasSize(10);
         items = (HashSet<String>) config.get("base.items", HashSet.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
+        assertThat(items).isNotNull().isNotEmpty().hasSize(10);
     }
 
     @Test
     public void testTreeSet_String(){
         Configuration config = Configuration.current();
         TreeSet<String> items = config.get("base.items", new 
TypeLiteral<TreeSet<String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
+        assertThat(items).isNotNull().isNotEmpty().hasSize(10);
         items = (TreeSet<String>) config.get("base.items", TreeSet.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
+        assertThat(items).isNotNull().isNotEmpty().hasSize(10);
     }
 
     @Test
     public void testMap_String(){
         Configuration config = Configuration.current();
         Map<String,String> items = config.get("base.map", new 
TypeLiteral<Map<String,String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(4);
-        assertThat("a").isEqualTo(items.get("1"));
-        assertThat("b").isEqualTo(items.get("2"));
-        assertThat("c").isEqualTo(items.get("3"));
-        assertThat(" ").isEqualTo(items.get("4"));
+        assertThat(items).isNotNull().isNotEmpty().hasSize(4)
+            .containsEntry("1", "a")
+            .containsEntry("2", "b")
+            .containsEntry("3", "c")
+            .containsEntry("4", " ");
         items = (Map<String,String>) config.get("base.map", Map.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(4);
-        assertThat("a").isEqualTo(items.get("1"));
-        assertThat("b").isEqualTo(items.get("2"));
-        assertThat("c").isEqualTo(items.get("3"));
-        assertThat(" ").isEqualTo(items.get("4"));
+        assertThat(items).isNotNull().isNotEmpty().hasSize(4)
+            .containsEntry("1", "a")
+            .containsEntry("2", "b")
+            .containsEntry("3", "c")
+            .containsEntry("4", " ");
     }
 
     @Test
     public void testHashMap_String(){
         Configuration config = Configuration.current();
         Map<String,String> items = config.get("base.map", new 
TypeLiteral<HashMap<String,String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(4);
-        assertThat("a").isEqualTo(items.get("1"));
-        assertThat("b").isEqualTo(items.get("2"));
-        assertThat("c").isEqualTo(items.get("3"));
-        assertThat(" ").isEqualTo(items.get("4"));
+        assertThat(items).isNotNull().isNotEmpty().hasSize(4)
+            .containsEntry("1", "a")
+            .containsEntry("2", "b")
+            .containsEntry("3", "c")
+            .containsEntry("4", " ");
         items = (HashMap<String,String>) config.get("base.map", HashMap.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(4);
-        assertThat("a").isEqualTo(items.get("1"));
-        assertThat("b").isEqualTo(items.get("2"));
-        assertThat("c").isEqualTo(items.get("3"));
-        assertThat(" ").isEqualTo(items.get("4"));
+        assertThat(items).isNotNull().isNotEmpty().hasSize(4)
+            .containsEntry("1", "a")
+            .containsEntry("2", "b")
+            .containsEntry("3", "c")
+            .containsEntry("4", " ");
     }
 
     @Test
     public void testSortedMap_String(){
         Configuration config = Configuration.current();
         Map<String,String> items = config.get("base.map", new 
TypeLiteral<SortedMap<String,String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(4);
-        assertThat("a").isEqualTo(items.get("1"));
-        assertThat("b").isEqualTo(items.get("2"));
-        assertThat("c").isEqualTo(items.get("3"));
-        assertThat(" ").isEqualTo(items.get("4"));
+        assertThat(items).isNotNull().isNotEmpty().hasSize(4)
+            .containsEntry("1", "a")
+            .containsEntry("2", "b")
+            .containsEntry("3", "c")
+            .containsEntry("4", " ");
         items = (Map<String,String>) config.get("base.map", SortedMap.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(4);
-        assertThat("a").isEqualTo(items.get("1"));
-        assertThat("b").isEqualTo(items.get("2"));
-        assertThat("c").isEqualTo(items.get("3"));
-        assertThat(" ").isEqualTo(items.get("4"));
+        assertThat(items).isNotNull().isNotEmpty().hasSize(4)
+            .containsEntry("1", "a")
+            .containsEntry("2", "b")
+            .containsEntry("3", "c")
+            .containsEntry("4", " ");
     }
 
     @Test
     public void testTreeMap_String(){
         Configuration config = Configuration.current();
         TreeMap<String,String> items = config.get("base.map", new 
TypeLiteral<TreeMap<String,String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(4);
-        assertThat("a").isEqualTo(items.get("1"));
-        assertThat("b").isEqualTo(items.get("2"));
-        assertThat("c").isEqualTo(items.get("3"));
-        assertThat(" ").isEqualTo(items.get("4"));
+        assertThat(items).isNotNull().isNotEmpty().hasSize(4)
+            .containsEntry("1", "a")
+            .containsEntry("2", "b")
+            .containsEntry("3", "c")
+            .containsEntry("4", " ");
         items =  config.get("base.map", TreeMap.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(4);
-        assertThat("a").isEqualTo(items.get("1"));
-        assertThat("b").isEqualTo(items.get("2"));
-        assertThat("c").isEqualTo(items.get("3"));
-        assertThat(" ").isEqualTo(items.get("4"));
+        assertThat(items).isNotNull().isNotEmpty().hasSize(4)
+            .containsEntry("1", "a")
+            .containsEntry("2", "b")
+            .containsEntry("3", "c")
+            .containsEntry("4", " ");
     }
 
     @Test
     public void testCollection_String(){
         Configuration config = Configuration.current();
         Collection<String> items = config.get("base.items", new 
TypeLiteral<Collection<String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
+        assertThat(items).isNotNull().isNotEmpty().hasSize(10);
         items = (Collection<String>) config.get("base.items", 
Collection.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
+        assertThat(items).isNotNull().isNotEmpty().hasSize(10);
     }
 }
diff --git 
a/modules/collections/src/test/java/org/apache/tamaya/collections/CollectionsTypedReadOnlyTests.java
 
b/modules/collections/src/test/java/org/apache/tamaya/collections/CollectionsTypedReadOnlyTests.java
index c339d9f..c330658 100644
--- 
a/modules/collections/src/test/java/org/apache/tamaya/collections/CollectionsTypedReadOnlyTests.java
+++ 
b/modules/collections/src/test/java/org/apache/tamaya/collections/CollectionsTypedReadOnlyTests.java
@@ -40,9 +40,7 @@ public class CollectionsTypedReadOnlyTests {
     public void testArrayListList_1(){
         Configuration config = Configuration.current();
         List<String> items = config.get("typed.arraylist", new 
TypeLiteral<List<String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
+        assertThat(items).isNotNull().isNotEmpty().hasSize(10);
         items.add("test");
     }
 
@@ -50,9 +48,7 @@ public class CollectionsTypedReadOnlyTests {
     public void testArrayListList_2(){
         Configuration config = Configuration.current();
         List<String> items = (List<String>) config.get("typed.arraylist", 
List.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
+        assertThat(items).isNotNull().isNotEmpty().hasSize(10);
         items.add("test");
     }
 
@@ -60,9 +56,7 @@ public class CollectionsTypedReadOnlyTests {
     public void testLinkedListList_1(){
         Configuration config = Configuration.current();
         List<String> items = config.get("typed.linkedlist", new 
TypeLiteral<List<String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
+        assertThat(items).isNotNull().isNotEmpty().hasSize(10);
         items.add("test");
     }
 
@@ -70,9 +64,7 @@ public class CollectionsTypedReadOnlyTests {
     public void testLinkedListList_2(){
         Configuration config = Configuration.current();
         List<String> items = (List<String>) config.get("typed.linkedlist", 
List.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
+        assertThat(items).isNotNull().isNotEmpty().hasSize(10);
         items.add("test");
     }
 
@@ -81,18 +73,14 @@ public class CollectionsTypedReadOnlyTests {
     public void testHashSet_1(){
         Configuration config = Configuration.current();
         Set<String> items = config.get("typed.hashset", new 
TypeLiteral<Set<String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
+        assertThat(items).isNotNull().isNotEmpty().hasSize(10);
         items.add("test");
     }
     @Test
     public void testHashSet_2(){
         Configuration config = Configuration.current();
         Set<String> items = (Set<String>) config.get("typed.hashset", 
Set.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
+        assertThat(items).isNotNull().isNotEmpty().hasSize(10);
         items.add("test");
     }
 
@@ -100,18 +88,14 @@ public class CollectionsTypedReadOnlyTests {
     public void testTreeSet_1(){
         Configuration config = Configuration.current();
         Set<String> items = config.get("typed.treeset", new 
TypeLiteral<Set<String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
+        assertThat(items).isNotNull().isNotEmpty().hasSize(10);
         items.add("test");
     }
     @Test
     public void testTreeSet_2(){
         Configuration config = Configuration.current();
         Set<String> items = items = (Set<String>) config.get("typed.treeset", 
Set.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
+        assertThat(items).isNotNull().isNotEmpty().hasSize(10);
         items.add("test");
     }
 
@@ -119,26 +103,22 @@ public class CollectionsTypedReadOnlyTests {
     public void testHashMap_1(){
         Configuration config = Configuration.current();
         Map<String,String> items = config.get("typed.hashmap", new 
TypeLiteral<Map<String,String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(4);
-        assertThat("a").isEqualTo(items.get("1"));
-        assertThat("b").isEqualTo(items.get("2"));
-        assertThat("c").isEqualTo(items.get("3"));
-        assertThat(" ").isEqualTo(items.get("4"));
+        assertThat(items).isNotNull().isNotEmpty().hasSize(4)
+            .containsEntry("1", "a")
+            .containsEntry("2", "b")
+            .containsEntry("3", "c")
+            .containsEntry("4", " ");
         items.put("g","hjhhj");
     }
     @Test(expected=UnsupportedOperationException.class)
     public void testHashMap_2(){
         Configuration config = Configuration.current();
         Map<String,String> items = (Map<String,String>) 
config.get("typed.hashmap", Map.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(4);
-        assertThat("a").isEqualTo(items.get("1"));
-        assertThat("b").isEqualTo(items.get("2"));
-        assertThat("c").isEqualTo(items.get("3"));
-        assertThat(" ").isEqualTo(items.get("4"));
+        assertThat(items).isNotNull().isNotEmpty().hasSize(4)
+            .containsEntry("1", "a")
+            .containsEntry("2", "b")
+            .containsEntry("3", "c")
+            .containsEntry("4", " ");
         items.put("g","hjhhj");
     }
 
@@ -147,26 +127,22 @@ public class CollectionsTypedReadOnlyTests {
     public void testTreeMap_1(){
         Configuration config = Configuration.current();
         Map<String,String> items = config.get("typed.treemap", new 
TypeLiteral<Map<String,String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(4);
-        assertThat("a").isEqualTo(items.get("1"));
-        assertThat("b").isEqualTo(items.get("2"));
-        assertThat("c").isEqualTo(items.get("3"));
-        assertThat(" ").isEqualTo(items.get("4"));
+        assertThat(items).isNotNull().isNotEmpty().hasSize(4)
+            .containsEntry("1", "a")
+            .containsEntry("2", "b")
+            .containsEntry("3", "c")
+            .containsEntry("4", " ");
         items.put("g","hjhhj");
     }
     @Test
     public void testTreeMap_2(){
         Configuration config = Configuration.current();
         Map<String,String> items = (Map<String,String>) 
config.get("typed.treemap", Map.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(4);
-        assertThat("a").isEqualTo(items.get("1"));
-        assertThat("b").isEqualTo(items.get("2"));
-        assertThat("c").isEqualTo(items.get("3"));
-        assertThat(" ").isEqualTo(items.get("4"));
+        assertThat(items).isNotNull().isNotEmpty().hasSize(4)
+            .containsEntry("1", "a")
+            .containsEntry("2", "b")
+            .containsEntry("3", "c")
+            .containsEntry("4", " ");
         items.put("g","hjhhj");
     }
 
diff --git 
a/modules/collections/src/test/java/org/apache/tamaya/collections/CollectionsTypedTests.java
 
b/modules/collections/src/test/java/org/apache/tamaya/collections/CollectionsTypedTests.java
index d6c21f1..4ec507b 100644
--- 
a/modules/collections/src/test/java/org/apache/tamaya/collections/CollectionsTypedTests.java
+++ 
b/modules/collections/src/test/java/org/apache/tamaya/collections/CollectionsTypedTests.java
@@ -38,30 +38,18 @@ public class CollectionsTypedTests {
     public void testArrayListList_String(){
         Configuration config = Configuration.current();
         List<String> items = config.get("typed2.arraylist", new 
TypeLiteral<List<String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
-        assertThat(items).isInstanceOf(ArrayList.class);
+        
assertThat(items).isNotNull().isNotEmpty().hasSize(10).isInstanceOf(ArrayList.class);
         items = (List<String>) config.get("typed2.arraylist", List.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
-        assertThat(items).isInstanceOf(ArrayList.class);
+        
assertThat(items).isNotNull().isNotEmpty().hasSize(10).isInstanceOf(ArrayList.class);
     }
 
     @Test
     public void testLinkedListList_String(){
         Configuration config = Configuration.current();
         List<String> items = config.get("typed2.linkedlist", new 
TypeLiteral<List<String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
-        assertThat(items).isInstanceOf(LinkedList.class);
+        
assertThat(items).isNotNull().isNotEmpty().hasSize(10).isInstanceOf(LinkedList.class);
         items = (List<String>) config.get("typed2.linkedlist", List.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
-        assertThat(items).isInstanceOf(LinkedList.class);
+        
assertThat(items).isNotNull().isNotEmpty().hasSize(10).isInstanceOf(LinkedList.class);
     }
 
 
@@ -69,136 +57,88 @@ public class CollectionsTypedTests {
     public void testHashSet_String(){
         Configuration config = Configuration.current();
         Set<String> items = config.get("typed2.hashset", new 
TypeLiteral<Set<String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
-        assertThat(items).isInstanceOf(HashSet.class);
+        
assertThat(items).isNotNull().isNotEmpty().hasSize(10).isInstanceOf(HashSet.class);
         items = (Set<String>) config.get("typed2.hashset", Set.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
-        assertThat(items).isInstanceOf(HashSet.class);
+        
assertThat(items).isNotNull().isNotEmpty().hasSize(10).isInstanceOf(HashSet.class);
     }
 
     @Test
     public void testTreeSet_String(){
         Configuration config = Configuration.current();
         Set<String> items = config.get("typed2.treeset", new 
TypeLiteral<Set<String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
-        assertThat(items).isInstanceOf(TreeSet.class);
+        
assertThat(items).isNotNull().isNotEmpty().hasSize(10).isInstanceOf(TreeSet.class);
         items = (Set<String>) config.get("typed2.treeset", Set.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
-        assertThat(items).isInstanceOf(TreeSet.class);
+        
assertThat(items).isNotNull().isNotEmpty().hasSize(10).isInstanceOf(TreeSet.class);
     }
 
     @Test
     public void testHashMap_String(){
         Configuration config = Configuration.current();
         Map<String,String> items = config.get("typed2.hashmap", new 
TypeLiteral<Map<String,String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(4);
-        assertThat("a").isEqualTo(items.get("1"));
-        assertThat("b").isEqualTo(items.get("2"));
-        assertThat("c").isEqualTo(items.get("3"));
-        assertThat(" ").isEqualTo(items.get("4"));
-        assertThat(items).isInstanceOf(HashMap.class);
+        
assertThat(items).isNotNull().isNotEmpty().hasSize(4).isInstanceOf(HashMap.class)
+            .containsEntry("1", "a")
+            .containsEntry("2", "b")
+            .containsEntry("3", "c")
+            .containsEntry("4", " ");
         items = (Map<String,String>) config.get("typed2.hashmap", Map.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(4);
-        assertThat("a").isEqualTo(items.get("1"));
-        assertThat("b").isEqualTo(items.get("2"));
-        assertThat("c").isEqualTo(items.get("3"));
-        assertThat(" ").isEqualTo(items.get("4"));
-        assertThat(items).isInstanceOf(HashMap.class);
+        
assertThat(items).isNotNull().isNotEmpty().hasSize(4).isInstanceOf(HashMap.class)
+            .containsEntry("1", "a")
+            .containsEntry("2", "b")
+            .containsEntry("3", "c")
+            .containsEntry("4", " ");
     }
 
     @Test
     public void testTreeMap_String(){
         Configuration config = Configuration.current();
         Map<String,String> items = config.get("typed2.treemap", new 
TypeLiteral<Map<String,String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(4);
-        assertThat("a").isEqualTo(items.get("1"));
-        assertThat("b").isEqualTo(items.get("2"));
-        assertThat("c").isEqualTo(items.get("3"));
-        assertThat(" ").isEqualTo(items.get("4"));
-        assertThat(items).isInstanceOf(TreeMap.class);
+        
assertThat(items).isNotNull().isNotEmpty().hasSize(4).isInstanceOf(TreeMap.class)
+            .containsEntry("1", "a")
+            .containsEntry("2", "b")
+            .containsEntry("3", "c")
+            .containsEntry("4", " ");
         items = (Map<String,String>) config.get("typed2.treemap", Map.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(4);
-        assertThat("a").isEqualTo(items.get("1"));
-        assertThat("b").isEqualTo(items.get("2"));
-        assertThat("c").isEqualTo(items.get("3"));
-        assertThat(" ").isEqualTo(items.get("4"));
-        assertThat(items).isInstanceOf(TreeMap.class);
+        
assertThat(items).isNotNull().isNotEmpty().hasSize(4).isInstanceOf(TreeMap.class)
+            .containsEntry("1", "a")
+            .containsEntry("2", "b")
+            .containsEntry("3", "c")
+            .containsEntry("4", " ");
     }
 
     @Test
     public void testCollection_HashSet(){
         Configuration config = Configuration.current();
         Collection<String> items = config.get("typed2.hashset", new 
TypeLiteral<Collection<String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
-        assertThat(items).isInstanceOf(HashSet.class);
+        
assertThat(items).isNotNull().isNotEmpty().hasSize(10).isInstanceOf(HashSet.class);
         items = (Collection<String>) config.get("typed2.hashset", 
Collection.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
-        assertThat(items).isInstanceOf(HashSet.class);
+        
assertThat(items).isNotNull().isNotEmpty().hasSize(10).isInstanceOf(HashSet.class);
     }
 
     @Test
     public void testCollection_TreeSet(){
         Configuration config = Configuration.current();
         Collection<String> items = config.get("typed2.treeset", new 
TypeLiteral<Collection<String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
-        assertThat(items).isInstanceOf(TreeSet.class);
+        
assertThat(items).isNotNull().isNotEmpty().hasSize(10).isInstanceOf(TreeSet.class);
         items = (Collection<String>) config.get("typed2.treeset", 
Collection.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
-        assertThat(items).isInstanceOf(TreeSet.class);
+        
assertThat(items).isNotNull().isNotEmpty().hasSize(10).isInstanceOf(TreeSet.class);
     }
 
     @Test
     public void testCollection_ArrayList(){
         Configuration config = Configuration.current();
         Collection<String> items = config.get("typed2.arraylist", new 
TypeLiteral<Collection<String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
-        assertThat(items).isInstanceOf(ArrayList.class);
+        
assertThat(items).isNotNull().isNotEmpty().hasSize(10).isInstanceOf(ArrayList.class);
         items = (Collection<String>) config.get("typed2.arraylist", 
Collection.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
-        assertThat(items).isInstanceOf(ArrayList.class);
+        
assertThat(items).isNotNull().isNotEmpty().hasSize(10).isInstanceOf(ArrayList.class);
     }
 
     @Test
     public void testCollection_LinkedList(){
         Configuration config = Configuration.current();
         Collection<String> items = config.get("typed2.linkedlist", new 
TypeLiteral<Collection<String>>(){});
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
-        assertThat(items).isInstanceOf(LinkedList.class);
+        
assertThat(items).isNotNull().isNotEmpty().hasSize(10).isInstanceOf(LinkedList.class);
         items = (Collection<String>) config.get("typed2.linkedlist", 
Collection.class);
-        assertThat(items).isNotNull();
-        assertThat(items.isEmpty()).isFalse();
-        assertThat(items).hasSize(10);
-        assertThat(items).isInstanceOf(LinkedList.class);
+        
assertThat(items).isNotNull().isNotEmpty().hasSize(10).isInstanceOf(LinkedList.class);
     }
 
 }
diff --git 
a/modules/consul/src/test/java/org/apache/tamaya/consul/ConsulWriteTest.java 
b/modules/consul/src/test/java/org/apache/tamaya/consul/ConsulWriteTest.java
index 93eccf5..f7700b0 100644
--- a/modules/consul/src/test/java/org/apache/tamaya/consul/ConsulWriteTest.java
+++ b/modules/consul/src/test/java/org/apache/tamaya/consul/ConsulWriteTest.java
@@ -77,7 +77,6 @@ public class ConsulWriteTest {
     @Test
     public void testGetProperties() throws Exception {
         if(!execute)return;
-        Map<String,PropertyValue> result = propertySource.getProperties();
-        assertThat(result.isEmpty()).isTrue();
+        assertThat(propertySource.getProperties()).isEmpty();
     }
 }
diff --git 
a/modules/events/src/test/java/org/apache/tamaya/events/ConfigurationChangeTest.java
 
b/modules/events/src/test/java/org/apache/tamaya/events/ConfigurationChangeTest.java
index 53b2a92..c452bd4 100644
--- 
a/modules/events/src/test/java/org/apache/tamaya/events/ConfigurationChangeTest.java
+++ 
b/modules/events/src/test/java/org/apache/tamaya/events/ConfigurationChangeTest.java
@@ -152,12 +152,7 @@ public class ConfigurationChangeTest {
     public void testToString() throws Exception {
         Configuration config = Configuration.current();
         ConfigurationChange change = 
ConfigurationChangeBuilder.of(config).removeKey("java.version").build();
-        String toString =
-                change.toString();
-        assertThat(toString.contains("timestamp")).isTrue();
-        assertThat(toString.contains("change-id")).isTrue();
-        assertThat(toString.contains("snapshot-id")).isTrue();
-        assertThat(toString.contains("key1")).isFalse();
-        assertThat(toString.contains("key2")).isFalse();
+        
assertThat(change.toString()).contains("timestamp").contains("change-id").contains("snapshot-id")
+            .doesNotContain("key1").doesNotContain("key2");
     }
 }
diff --git 
a/modules/events/src/test/java/org/apache/tamaya/events/FrozenPropertySourceTest.java
 
b/modules/events/src/test/java/org/apache/tamaya/events/FrozenPropertySourceTest.java
index e16360b..bbfb7c6 100644
--- 
a/modules/events/src/test/java/org/apache/tamaya/events/FrozenPropertySourceTest.java
+++ 
b/modules/events/src/test/java/org/apache/tamaya/events/FrozenPropertySourceTest.java
@@ -77,7 +77,7 @@ public class FrozenPropertySourceTest {
         PropertySource ps1 = FrozenPropertySource.of(myPS);
         PropertySource ps2 = FrozenPropertySource.of(myPS);
         assertThat(ps1.getName()).isEqualTo(ps2.getName());
-        
assertThat(ps1.getProperties().size()).isEqualTo(ps2.getProperties().size());
+        assertThat(ps1.getProperties()).hasSize(ps2.getProperties().size());
     }
 
     @Test
@@ -101,8 +101,6 @@ public class FrozenPropertySourceTest {
     public void testToString() throws Exception {
         PropertySource ps = FrozenPropertySource.of(myPS);
         String toString = ps.toString();
-        assertThat(toString).isNotNull();
-        assertThat(toString.contains("FrozenPropertySource")).isTrue();
-        assertThat(toString.contains(myPS.getName())).isTrue();
+        
assertThat(toString).isNotNull().contains("FrozenPropertySource").contains(myPS.getName());
     }
 }
diff --git 
a/modules/filter/src/test/java/org/apache/tamaya/filter/ProgrammableFilterTest.java
 
b/modules/filter/src/test/java/org/apache/tamaya/filter/ProgrammableFilterTest.java
index 81ea141..6411738 100644
--- 
a/modules/filter/src/test/java/org/apache/tamaya/filter/ProgrammableFilterTest.java
+++ 
b/modules/filter/src/test/java/org/apache/tamaya/filter/ProgrammableFilterTest.java
@@ -134,28 +134,22 @@ public class ProgrammableFilterTest {
     @Test
     public void testGetFilters() throws Exception {
         ThreadFilterContext filter = new ThreadFilterContext();
-        assertThat(filter.getFilters()).isNotNull();
-        assertThat(filter.getFilters().isEmpty()).isTrue();
+        assertThat(filter.getFilters()).isNotNull().isEmpty();
         RegexPropertyFilter regexFilter = new RegexPropertyFilter();
         regexFilter.setIncludes("test\\..*");
         filter.addFilter(regexFilter);
-        assertThat(filter.getFilters()).isNotNull();
-        assertThat(filter.getFilters().isEmpty()).isFalse();
-        assertThat(filter.getFilters()).hasSize(1);
-        assertThat(regexFilter).isEqualTo(filter.getFilters().get(0));
+        
assertThat(filter.getFilters()).isNotNull().isNotEmpty().hasSize(1).contains(regexFilter);
     }
 
     @Test
     public void testToString() throws Exception {
         ThreadFilterContext filter = new ThreadFilterContext();
-        assertThat(filter.toString().contains("test\\..*")).isFalse();
-        assertThat(filter.toString().contains("ProgrammableFilter")).isTrue();
-        
assertThat(filter.toString().contains("RegexPropertyFilter")).isFalse();
+        assertThat(filter.toString()).contains("ProgrammableFilter")
+            .doesNotContain("RegexPropertyFilter").doesNotContain("test\\..*");
         RegexPropertyFilter regexFilter = new RegexPropertyFilter();
         regexFilter.setIncludes("test\\..*");
         filter.addFilter(regexFilter);
-        assertThat(filter.toString().contains("test\\..*")).isTrue();
-        assertThat(filter.toString().contains("ProgrammableFilter")).isTrue();
-        assertThat(filter.toString().contains("RegexPropertyFilter")).isTrue();
+        assertThat(filter.toString()).contains("ProgrammableFilter")
+            .contains("RegexPropertyFilter").contains("test\\..*");
     }
 }
diff --git 
a/modules/functions/src/test/java/org/apache/tamaya/functions/ConfigurationFunctionsTest.java
 
b/modules/functions/src/test/java/org/apache/tamaya/functions/ConfigurationFunctionsTest.java
index 4fe0591..f37213b 100644
--- 
a/modules/functions/src/test/java/org/apache/tamaya/functions/ConfigurationFunctionsTest.java
+++ 
b/modules/functions/src/test/java/org/apache/tamaya/functions/ConfigurationFunctionsTest.java
@@ -147,8 +147,7 @@ public class ConfigurationFunctionsTest {
     public void testEmptyConfiguration() throws Exception {
         Configuration ps = ConfigurationFunctions.emptyConfiguration();
         assertThat(ps).isNotNull();
-        assertThat(ps.getProperties()).isNotNull();
-        assertThat(ps.getProperties().isEmpty()).isTrue();
+        assertThat(ps.getProperties()).isNotNull().isEmpty();
     }
 
 
diff --git 
a/modules/functions/src/test/java/org/apache/tamaya/functions/PropertySourceFunctionsTest.java
 
b/modules/functions/src/test/java/org/apache/tamaya/functions/PropertySourceFunctionsTest.java
index e9bc970..17a0e21 100644
--- 
a/modules/functions/src/test/java/org/apache/tamaya/functions/PropertySourceFunctionsTest.java
+++ 
b/modules/functions/src/test/java/org/apache/tamaya/functions/PropertySourceFunctionsTest.java
@@ -355,8 +355,7 @@ public class PropertySourceFunctionsTest {
     public void testEmptyPropertySource() throws Exception {
         PropertySource ps = PropertySource.EMPTY;
         assertThat(ps).isNotNull();
-        assertThat(ps.getProperties()).isNotNull();
-        assertThat(ps.getProperties().isEmpty()).isTrue();
+        assertThat(ps.getProperties()).isNotNull().isEmpty();
         assertThat(ps.getName()).isEqualTo("<empty>");
     }
 }
diff --git 
a/modules/hazelcast/src/test/java/org/apache/tamaya/hazelcast/AbstractHzPropertySourceTest.java
 
b/modules/hazelcast/src/test/java/org/apache/tamaya/hazelcast/AbstractHzPropertySourceTest.java
index 30a9bc4..a6c4e84 100644
--- 
a/modules/hazelcast/src/test/java/org/apache/tamaya/hazelcast/AbstractHzPropertySourceTest.java
+++ 
b/modules/hazelcast/src/test/java/org/apache/tamaya/hazelcast/AbstractHzPropertySourceTest.java
@@ -62,8 +62,7 @@ public class AbstractHzPropertySourceTest {
     public void t01_testGetProperties(){
         hps.setMapReference("config");
         Map<String, PropertyValue> values = hps.getProperties();
-        assertThat(values).isNotNull();
-        assertThat(3).isEqualTo(values.size());
+        assertThat(values).isNotNull().hasSize(3);
         assertThat(values.get("k1")).isNotNull();
         assertThat(values.get("k2")).isNotNull();
         assertThat("v1").isEqualTo(values.get("k1").getValue());
@@ -72,8 +71,7 @@ public class AbstractHzPropertySourceTest {
 
         hps.setMapReference("config2");
         Map<String, PropertyValue> values2 = hps.getProperties();
-        assertThat(values2).isNotNull();
-        assertThat(2).isEqualTo(values2.size());
+        assertThat(values2).isNotNull().hasSize(2);
         assertThat(values2.get("key1")).isNotNull();
         assertThat(values2.get("key2")).isNotNull();
         assertThat("val1").isEqualTo(values2.get("key1").getValue());
diff --git 
a/modules/hazelcast/src/test/java/org/apache/tamaya/hazelcast/HazelcastPropertySourceTest.java
 
b/modules/hazelcast/src/test/java/org/apache/tamaya/hazelcast/HazelcastPropertySourceTest.java
index cdf2140..17a025f 100644
--- 
a/modules/hazelcast/src/test/java/org/apache/tamaya/hazelcast/HazelcastPropertySourceTest.java
+++ 
b/modules/hazelcast/src/test/java/org/apache/tamaya/hazelcast/HazelcastPropertySourceTest.java
@@ -61,8 +61,7 @@ public class HazelcastPropertySourceTest {
     public void t01_testGetProperties(){
         hps.setMapReference("config3");
         Map<String, PropertyValue> values = hps.getProperties();
-        assertThat(values).isNotNull();
-        assertThat(3).isEqualTo(values.size());
+        assertThat(values).isNotNull().hasSize(3);
         assertThat(values.get("k1")).isNotNull();
         assertThat(values.get("k2")).isNotNull();
         assertThat("v1").isEqualTo(values.get("k1").getValue());
@@ -71,8 +70,7 @@ public class HazelcastPropertySourceTest {
 
         hps.setMapReference("config4");
         Map<String, PropertyValue> values2 = hps.getProperties();
-        assertThat(values2).isNotNull();
-        assertThat(2).isEqualTo(values2.size());
+        assertThat(values2).isNotNull().hasSize(2);
         assertThat(values2.get("key1")).isNotNull();
         assertThat(values2.get("key2")).isNotNull();
         assertThat("val1").isEqualTo(values2.get("key1").getValue());
@@ -82,8 +80,7 @@ public class HazelcastPropertySourceTest {
         hps.setMapReference("bar");
         hps.setDefaultOrdinal(1500);
         Map<String, PropertyValue> values3 = hps.getProperties();
-        assertThat(values3).isNotNull();
-        assertThat(0).isEqualTo(values3.size());
+        assertThat(values3).isNotNull().hasSize(0);
         assertThat(hps.getOrdinal()).isEqualTo(1500);
     }
 
@@ -159,8 +156,7 @@ public class HazelcastPropertySourceTest {
         hps.setMapReference("config3");
         hps.setDefaultOrdinal(200);
         Map<String, PropertyValue> values = hps.getProperties();
-        assertThat(values).isNotNull();
-        assertThat(3).isEqualTo(values.size());
+        assertThat(values).isNotNull().hasSize(3);
         assertThat(values.get("k1")).isNotNull();
         assertThat(values.get("k2")).isNotNull();
         assertThat("v1").isEqualTo(values.get("k1").getValue());
@@ -176,8 +172,7 @@ public class HazelcastPropertySourceTest {
         assertThat(50L).isEqualTo(hps.getCachePeriod());
         assertThat(hps.getValidUntil() >= System.currentTimeMillis()).isTrue();
         values = hps.getProperties();
-        assertThat(values).isNotNull();
-        assertThat(3).isEqualTo(values.size());
+        assertThat(values).isNotNull().hasSize(3);
         assertThat(values.get("k1")).isNotNull();
         assertThat(values.get("k2")).isNotNull();
         assertThat("v1").isEqualTo(values.get("k1").getValue());
@@ -189,8 +184,7 @@ public class HazelcastPropertySourceTest {
 
         // Read updated values
         values = hps.getProperties();
-        assertThat(values).isNotNull();
-        assertThat(3).isEqualTo(values.size());
+        assertThat(values).isNotNull().hasSize(3);
         assertThat(values.get("k1")).isNotNull();
         assertThat(values.get("k2")).isNotNull();
         assertThat(values.get("k3")).isNotNull();
diff --git 
a/modules/jndi/src/test/java/org/apache/tamaya/jndi/JNDIPropertySourceTest.java 
b/modules/jndi/src/test/java/org/apache/tamaya/jndi/JNDIPropertySourceTest.java
index 9497565..2d7d246 100644
--- 
a/modules/jndi/src/test/java/org/apache/tamaya/jndi/JNDIPropertySourceTest.java
+++ 
b/modules/jndi/src/test/java/org/apache/tamaya/jndi/JNDIPropertySourceTest.java
@@ -53,20 +53,11 @@ public class JNDIPropertySourceTest{
     public void testScanContext() throws NamingException, 
MalformedURLException {
         JNDIPropertySource ps = new JNDIPropertySource("jndi-test", 
getTestDirContext(createFSContext()));
         assertThat(ps.isScannable()).isFalse();
-        Map<String,PropertyValue> props = ps.getProperties();
-        assertThat(props).isNotNull();
-        assertThat(props.isEmpty()).isTrue();
+        assertThat(ps.getProperties()).isNotNull().isEmpty();
         ps.setScannable(true);
         assertThat(ps.isScannable()).isTrue();
-        props = ps.getProperties();
-        assertThat(props).isNotNull();
-        assertThat(props.isEmpty()).isFalse();
-        assertThat(props).hasSize(5);
-        assertThat(props.get("c.c1.test5")).isNotNull();
-        assertThat(props.get("c.test3")).isNotNull();
-        assertThat(props.get("c.test4")).isNotNull();
-        assertThat(props.get("b.test2")).isNotNull();
-        assertThat(props.get("a.test1")).isNotNull();
+        assertThat(ps.getProperties()).isNotNull().isNotEmpty().hasSize(5)
+            .containsKeys("a.test1", "b.test2", "c.test3", "c.test4", 
"c.c1.test5");
     }
 
 }
diff --git 
a/modules/microprofile/src/test/java/org/apache/tamaya/microprofile/MicroprofileConfigTest.java
 
b/modules/microprofile/src/test/java/org/apache/tamaya/microprofile/MicroprofileConfigTest.java
index 92002fb..7c98b08 100644
--- 
a/modules/microprofile/src/test/java/org/apache/tamaya/microprofile/MicroprofileConfigTest.java
+++ 
b/modules/microprofile/src/test/java/org/apache/tamaya/microprofile/MicroprofileConfigTest.java
@@ -56,8 +56,7 @@ public class MicroprofileConfigTest {
             Optional<String> val = config.getOptionalValue(key, String.class);
             assertThat(val).isNotNull();
             val = config.getOptionalValue(key + System.currentTimeMillis(), 
String.class);
-            assertThat(val).isNotNull();
-            assertThat(val.isPresent()).isFalse();
+            assertThat(val).isNotNull().isNotPresent();
         }
     }
 
diff --git 
a/modules/resolver/src/test/java/org/apache/tamaya/resolver/ConfigResolutionTest.java
 
b/modules/resolver/src/test/java/org/apache/tamaya/resolver/ConfigResolutionTest.java
index 33a9823..1e6270e 100644
--- 
a/modules/resolver/src/test/java/org/apache/tamaya/resolver/ConfigResolutionTest.java
+++ 
b/modules/resolver/src/test/java/org/apache/tamaya/resolver/ConfigResolutionTest.java
@@ -95,22 +95,19 @@ public class ConfigResolutionTest {
     @Test
     public void testClasspath_Refs() {
         String value = Configuration.current().get("cp-ref");
-        assertThat(value).isNotNull();
-        assertThat(value.contains("This content comes from 
Testresource.txt!")).isTrue();
+        assertThat(value).isNotNull().contains("This content comes from 
Testresource.txt!");
     }
 
     @Test
     public void testResource_Refs() {
         String value = Configuration.current().get("res-ref");
-        assertThat(value).isNotNull();
-        assertThat(value.contains("This content comes from 
Testresource.txt!")).isTrue();
+        assertThat(value).isNotNull().contains("This content comes from 
Testresource.txt!");
     }
 
     @Test
     public void testFile_Refs() {
         String value = Configuration.current().get("file-ref");
-        assertThat(value).isNotNull();
-        assertThat(value.contains("This content comes from 
Testresource2.txt!")).isTrue();
+        assertThat(value).isNotNull().contains("This content comes from 
Testresource2.txt!");
     }
 
     @Test
diff --git 
a/modules/resources/src/test/java/org/apache/tamaya/resource/AbstractPathPropertySourceProviderTest.java
 
b/modules/resources/src/test/java/org/apache/tamaya/resource/AbstractPathPropertySourceProviderTest.java
index 74806bb..1d13ed2 100644
--- 
a/modules/resources/src/test/java/org/apache/tamaya/resource/AbstractPathPropertySourceProviderTest.java
+++ 
b/modules/resources/src/test/java/org/apache/tamaya/resource/AbstractPathPropertySourceProviderTest.java
@@ -55,7 +55,7 @@ public class AbstractPathPropertySourceProviderTest {
                 
ClassLoader.getSystemClassLoader().getResource("test.properties")
         );
         assertThat(ps).isNotNull();
-        assertThat(ps.getProperties().isEmpty()).isTrue();
+        assertThat(ps.getProperties()).isEmpty();
     }
 
     private static final class EmptyPropertySource implements PropertySource {

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