fail("UnsupportedOperationException expected");
    } catch (UnsupportedOperationException expected) {
    }
    try {
      unmod.putAll(singletonMap(4, "four"));
      fail("UnsupportedOperationException expected");
    } catch (UnsupportedOperationException expected) {
    }
    try {
      unmod.remove(4);
      fail("UnsupportedOperationException expected");

			if err != nil {
				t.Fatalf("Got unexpected error: %v", err)
			}
			if got := cfg.HasActiveRules(tc.prefix, false); got != tc.expectedNonRec {
				t.Fatalf("Expected result with recursive set to false: `%v`, got: `%v`", tc.expectedNonRec, got)
			}
			if got := cfg.HasActiveRules(tc.prefix, true); got != tc.expectedRec {
				t.Fatalf("Expected result with recursive set to true: `%v`, got: `%v`", tc.expectedRec, got)

            // Wait for completion
            for (Thread t : threads) {
                t.join();
            }

            // Verify thread safety - no unexpected exceptions
            assertEquals(0, exceptionCount.get(), "Should not have unexpected exceptions");

            // At least some threads should complete successfully

		t.Fatalf("failed to query product, got error %v", err)
	}

	if result.Name != "Product 1 (Updated)" {
		t.Errorf("expected name to be 'Product 1 (Updated)', got %s", result.Name)
	}

	if result.Data != nil {
		t.Errorf("expected Data to be nil, got %v", result.Data)
	}

	// Test with non-nil value
	dataValue := map[string]interface{}{"key": "value"}

    IllegalArgumentException expected =
        assertThrows(
            IllegalArgumentException.class,
            () -> {
              BloomFilter<String> unused =
                  BloomFilter.create(HashTestUtils.BAD_FUNNEL, Integer.MAX_VALUE, Double.MIN_VALUE);
            });
    assertThat(expected)
        .hasMessageThat()

    ValueAndCloser<?> valueAndCloser = finishToValueAndCloser(closingFuture);
    try {
      valueAndCloser.get();
      fail();
    } catch (ExecutionException expected) {
      assertThat(expected).hasCauseThat().isSameInstanceAs(exception);
    }
    valueAndCloser.closeAsync();
  }

  @Override
  void assertBecomesCanceled(ClosingFuture<?> closingFuture) throws ExecutionException {

    }

    public void test_escapeXml_allSpecialChars() {
        // Test all special characters
        String input = "Test & < > \"quote\" 'apos'";
        String expected = "Test &amp; &lt; &gt; &quot;quote&quot; &apos;apos&apos;";
        assertEquals(expected, XmlUtil.escapeXml(input));
    }

    public void test_escapeXml_noSpecialChars() {
        // Test string without special characters

          }
        };
    Thread runner = new Thread(task);
    runner.start();
    isInterruptibleRegistered.await();
    RuntimeException expected = assertThrows(RuntimeException.class, () -> task.interruptTask());
    assertThat(expected)
        .hasMessageThat()
        .isEqualTo("I bet you didn't think Thread.interrupt could throw");
    /*

		config.SetRegion(globalServerConfig, testCase.serverConfigRegion)
		_, actualCode := parseLocationConstraint(testCase.request)
		if testCase.expectedCode != actualCode {
			t.Errorf("Test %d: Expected the APIErrCode to be %d, but instead found %d", i+1, testCase.expectedCode, actualCode)
		}
	}
}

// Tests validate metadata extraction from http headers.
func TestExtractMetadataHeaders(t *testing.T) {

    } catch (UnsupportedOperationException expected) {
    }
    list.remove(0);
    assertEquals(asList("2", "3", "4"), list);
    list.remove("3");
    assertEquals(asList("2", "4"), list);
    try {
      list.set(0, "5");
      fail("transformed list is setable");
    } catch (UnsupportedOperationException expected) {
    }
    list.clear();
    assertEquals(emptyList(), list);
  }