nastra commented on code in PR #14808:
URL: https://github.com/apache/iceberg/pull/14808#discussion_r2613953346


##########
core/src/test/java/org/apache/iceberg/rest/TestRESTCatalog.java:
##########
@@ -3311,6 +3312,113 @@ public void 
testClientDoesNotSendIdempotencyWhenServerNotAdvertising() {
     local.dropTable(ident);
   }
 
+  @Test
+  public void testClientWithDefaultNamespaceSeparator() {
+    RESTCatalogAdapter adapter = Mockito.spy(new 
RESTCatalogAdapter(backendCatalog));
+
+    // Simulate that the server doesn't send the namespace separator in the 
overrides
+    Mockito.doAnswer(
+            invocation -> {
+              ConfigResponse configResponse = (ConfigResponse) 
invocation.callRealMethod();
+
+              Map<String, String> overridesWithoutNamespaceSeparator = 
configResponse.overrides();
+              
overridesWithoutNamespaceSeparator.remove(RESTCatalogProperties.NAMESPACE_SEPARATOR);
+
+              return ConfigResponse.builder()
+                  .withDefaults(configResponse.defaults())
+                  .withOverrides(overridesWithoutNamespaceSeparator)
+                  .withEndpoints(configResponse.endpoints())
+                  
.withIdempotencyKeyLifetime(configResponse.idempotencyKeyLifetime())
+                  .build();
+            })
+        .when(adapter)
+        .execute(
+            reqMatcher(HTTPMethod.GET, ResourcePaths.config()),
+            eq(ConfigResponse.class),
+            any(),
+            any());
+
+    RESTCatalog catalog = catalog(adapter);
+
+    // Do verification with paths using the default namespace separator.
+    ResourcePaths paths = 
ResourcePaths.forCatalogProperties(ImmutableMap.of());
+
+    runConfigurableNamespaceSeparatorTest(
+        catalog, adapter, paths, 
RESTUtil.NAMESPACE_SEPARATOR_URLENCODED_UTF_8);
+  }
+
+  @Test
+  public void testClientNamespaceSeparatorOverridden() {
+    RESTCatalogAdapter adapter = Mockito.spy(new 
RESTCatalogAdapter(backendCatalog));
+
+    // When initializing the catalog, the adapter always sends an override for 
the namespace
+    // separator.
+    Mockito.doAnswer(
+            invocation -> {
+              ConfigResponse configResponse = (ConfigResponse) 
invocation.callRealMethod();
+
+              assertThat(configResponse.overrides())
+                  .contains(

Review Comment:
   you can just use `containsEntry(...)` directly here



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