nastra commented on code in PR #14808:
URL: https://github.com/apache/iceberg/pull/14808#discussion_r2614432605


##########
core/src/test/java/org/apache/iceberg/rest/TestResourcePaths.java:
##########
@@ -110,6 +110,47 @@ public void testNamespaceWithDot(String 
namespaceSeparator) {
         .isEqualTo("v1/namespaces/" + namespace);
   }
 
+  @Test
+  public void testDecodeNamespaceContainingLegacySeparators() {
+    Namespace namespace = Namespace.of("first", "second", "third");
+    String legacySeparator = RESTUtil.NAMESPACE_SEPARATOR_URLENCODED_UTF_8;
+    String newSeparator = 
RESTCatalogAdapter.NAMESPACE_SEPARATOR_URLENCODED_UTF_8;
+
+    // legacy separator is always used by default, so no need to configure it
+    ResourcePaths pathsWithLegacySeparator = 
ResourcePaths.forCatalogProperties(ImmutableMap.of());
+
+    // Encode namespace using legacy separator. No need to provide the 
separator to encodeNamespace
+    String legacyEncodedNamespace = RESTUtil.encodeNamespace(namespace);
+    assertThat(pathsWithLegacySeparator.namespace(namespace))
+        .contains(legacyEncodedNamespace)
+        .contains(legacySeparator);
+
+    // Decode the namespace containing legacy separator without providing the 
separator
+    
assertThat(RESTUtil.decodeNamespace(legacyEncodedNamespace)).isEqualTo(namespace);
+
+    // Decode the namespace containing legacy separator with providing the new 
separator
+    assertThat(RESTUtil.decodeNamespace(legacyEncodedNamespace, 
newSeparator)).isEqualTo(namespace);
+  }
+
+  @Test
+  public void testDecodeNamespaceContainingNewSeparators() {

Review Comment:
   ```suggestion
     public void nestedNamespaceWithNewSeparator() {
   ```



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