aledsage commented on a change in pull request #1010: BROOKLYN-605 rebind fails 
for historic state
URL: https://github.com/apache/brooklyn-server/pull/1010#discussion_r228574716
 
 

 ##########
 File path: 
core/src/test/java/org/apache/brooklyn/core/catalog/internal/CatalogUpgradeScannerTest.java
 ##########
 @@ -0,0 +1,322 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.brooklyn.core.catalog.internal;
+
+import com.google.common.base.Predicate;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ImmutableMultimap;
+import com.google.common.collect.Multimap;
+import org.apache.brooklyn.api.typereg.ManagedBundle;
+import org.apache.brooklyn.api.typereg.OsgiBundleWithUrl;
+import org.apache.brooklyn.api.typereg.RegisteredType;
+import org.apache.brooklyn.core.mgmt.ha.OsgiManager;
+import org.apache.brooklyn.core.mgmt.internal.LocalManagementContext;
+import org.apache.brooklyn.core.mgmt.internal.ManagementContextInternal;
+import org.apache.brooklyn.core.typereg.BasicManagedBundle;
+import org.apache.brooklyn.core.typereg.BundleUpgradeParser.CatalogUpgrades;
+import org.apache.brooklyn.core.typereg.BundleUpgradeParser.VersionRangedName;
+import org.apache.brooklyn.util.guava.Maybe;
+import org.apache.brooklyn.util.osgi.VersionedName;
+import org.assertj.core.api.WithAssertions;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.osgi.framework.Bundle;
+import org.osgi.framework.BundleContext;
+import org.testng.annotations.BeforeClass;
+import org.testng.annotations.Test;
+
+import java.util.Collections;
+import java.util.Map;
+import java.util.function.BiFunction;
+import java.util.function.Function;
+
+import static 
org.apache.brooklyn.core.catalog.internal.CatalogUpgradeScannerTest.Givens.*;
+import static 
org.apache.brooklyn.core.catalog.internal.CatalogUpgradeScannerTest.Utils.*;
+import static org.apache.brooklyn.core.typereg.BundleTestUtil.newMockBundle;
+import static org.assertj.core.api.SoftAssertions.assertSoftly;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.mock;
+
+public class CatalogUpgradeScannerTest implements WithAssertions {
+
+    // collaborators
+    private final ManagementContextInternal managementContext = new 
LocalManagementContext();
+    @Mock
+    private BiFunction<Bundle, RegisteredTypesSupplier, CatalogUpgrades> 
bundleUpgradeParser;
+    @Mock
+    private Function<OsgiBundleWithUrl, Predicate<? super RegisteredType>> 
managedBundlePredicateSupplier;
+    @Mock
+    private Function<String, Predicate<? super RegisteredType>> 
unmanagedBundlePredicateSupplier;
+
+    // subject under test
+    private CatalogUpgradeScanner scanner;
+
+    // parameters
+    private final OsgiManager osgiManager = mock(OsgiManager.class);
+    private final CatalogInitialization.RebindLogger rebindLogger = 
mock(CatalogInitialization.RebindLogger.class);
+    private final BundleContext bundleContext = mock(BundleContext.class);
+
+    @BeforeClass
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        scanner = new CatalogUpgradeScanner(managementContext, 
bundleUpgradeParser, managedBundlePredicateSupplier,
+                        unmanagedBundlePredicateSupplier);
+    }
+
+    private CatalogUpgrades invoke() {
+        return scanner.scan(osgiManager, bundleContext, rebindLogger);
+    }
+
+    @Test
+    public void whenNoUnmanagedOrManagedBundlesThenNoUpgrades() {
+        //given
+        givenNoManagedBundles(osgiManager);
+        givenNoUnmanagedBundles(bundleContext);
+        //when
+        final CatalogUpgrades result = invoke();
+        //then
+        assertThatThereAreNoUpgrades(result);
+    }
+
+    @Test
+    public void whenUnmanagedAndManagedBundlesWithNoUpgradesThenNoUpgrades() {
+        //given
+        givenManagedBundlesWithNoUpgrades(osgiManager, bundleUpgradeParser);
+        givenUnmanagedBundlesWithNoUpgrades(bundleContext, 
bundleUpgradeParser);
+        //when
+        final CatalogUpgrades result = invoke();
+        //then
+        assertThatThereAreNoUpgrades(result);
+    }
+
+    @Test
+    public void whenOnlyManagedBundleHasUpgradesThenUpgradesForManagedBundle() 
{
+        //given
+        final String upgradeFrom = bundleName("managed", "1.0.0");
+        final String upgradeTo = bundleName("managed", "2.0.0");
+        final CatalogUpgrades catalogUpgrades = CatalogUpgrades.builder()
+                .upgradeBundles(upgradeMapping(upgradeFrom, upgradeTo))
+                .build();
+        givenManagedBundlesWithUpgrades(catalogUpgrades, osgiManager, 
bundleUpgradeParser);
+        givenUnmanagedBundlesWithNoUpgrades(bundleContext, 
bundleUpgradeParser);
+        //when
+        final CatalogUpgrades result = invoke();
+        //then
+        assertThatBundleHasUpgrades(result, upgradeFrom, upgradeTo);
+    }
+
+    @Test
+    public void 
whenOnlyManagedBundleHasUpgradesThenNoUpgradesForUnmanagedBundles() {
+        //given
+        final String upgradeFrom = bundleName("managed", "1.0.0");
+        final String upgradeTo = bundleName("managed", "2.0.0");
+        final CatalogUpgrades catalogUpgrades = CatalogUpgrades.builder()
+                .upgradeBundles(upgradeMapping(upgradeFrom, upgradeTo))
+                .build();
+        givenManagedBundlesWithUpgrades(catalogUpgrades, osgiManager, 
bundleUpgradeParser);
+        final String unmanagedBundle = bundleName("unmanaged", "1.1.0");
+        givenUnmanagedBundleWithNoUpgrades(unmanagedBundle, bundleContext, 
bundleUpgradeParser);
+        //when
+        final CatalogUpgrades result = invoke();
+        //then
+        assertThatBundleHasNoUpgrades(result, unmanagedBundle);
+    }
+
+    @Test
+    public void 
whenOnlyUnmanagedBundleHasUpgradesThenUpgradesForUnmanagedBundle() {
+        //given
+        final String upgradeFrom = bundleName("unmanaged", "1.0.0");
+        final String upgradeTo = bundleName("unmanaged", "2.0.0");
+        final CatalogUpgrades catalogUpgrades = CatalogUpgrades.builder()
+                .upgradeBundles(upgradeMapping(upgradeFrom, upgradeTo))
+                .build();
+        givenManagedBundlesWithNoUpgrades(osgiManager, bundleUpgradeParser);
+        givenUnmanagedBundleWithUpgrades(catalogUpgrades, bundleContext, 
bundleUpgradeParser);
+        //when
+        final CatalogUpgrades result = invoke();
+        //then
+        assertThatBundleHasUpgrades(result, upgradeFrom, upgradeTo);
+    }
+
+    @Test
+    public void 
whenOnlyUnmanagedBundleHasUpgradesThenNoUpgradesForManagedBundles() {
+        //given
+        final String upgradeFrom = bundleName("unmanaged", "1.0.0");
+        final String upgradeTo = bundleName("unmanaged", "2.0.0");
+        final CatalogUpgrades catalogUpgrades = CatalogUpgrades.builder()
+                .upgradeBundles(upgradeMapping(upgradeFrom, upgradeTo))
+                .build();
+        final String managedBundle = bundleName("managed", "1.1.0");
+        givenManagedBundleWithNoUpgrades(managedBundle, osgiManager, 
bundleUpgradeParser);
+        givenUnmanagedBundleWithUpgrades(catalogUpgrades, bundleContext, 
bundleUpgradeParser);
+        //when
+        final CatalogUpgrades result = invoke();
+        //then
+        assertThatBundleHasNoUpgrades(result, managedBundle);
+    }
+
+    static class Givens {
+
+        static void givenNoManagedBundles(final OsgiManager osgiManager) {
+            final Map<String, ManagedBundle> noBundles = 
Collections.emptyMap();
+            given(osgiManager.getManagedBundles()).willReturn(noBundles);
+        }
+
+        static void givenNoUnmanagedBundles(BundleContext bundleContext) {
+            final Bundle[] noBundles = new Bundle[0];
+            given(bundleContext.getBundles()).willReturn(noBundles);
+        }
+
+        static void givenManagedBundlesWithNoUpgrades(
+                final OsgiManager osgiManager,
+                final BiFunction<Bundle, RegisteredTypesSupplier, 
CatalogUpgrades> bundleUpgradeParser
+        ) {
+            final Map<String, ManagedBundle> managedBundlesWithNoUpgrades =
+                    ImmutableMap.of(
+                            "managed1", findableManagedBundle(osgiManager, 
CatalogUpgrades.EMPTY, bundleUpgradeParser),
+                            "managed2", findableManagedBundle(osgiManager, 
CatalogUpgrades.EMPTY, bundleUpgradeParser)
+                    );
+            
doReturn(managedBundlesWithNoUpgrades).when(osgiManager).getManagedBundles();
+        }
+
+        static void givenManagedBundlesWithUpgrades(
+                final CatalogUpgrades upgrades,
+                final OsgiManager osgiManager,
+                final BiFunction<Bundle, RegisteredTypesSupplier, 
CatalogUpgrades> bundleUpgradeParser
+        ) {
+            final Map<String, ManagedBundle> managedBundlesWithNoUpgrades =
 
 Review comment:
   Copy-paste of variable isn't quite right.
   
   I have personal preference for shorter variable names, rather than repeating 
a chunk of the method name. For example, `bundles` would be a fine variable 
name in all of these methods. that has the added benefit of making the 
differences between them easier to spot, rather than there being long names / 
differences in variables names.

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