}
    }

    // Test property filter returning null simulation
    public void test_get_filterReturnsNull() {
        // The filter.null property is configured to simulate null filter behavior
        try {
            fessConfig.get("filter.null");
            fail("Should throw exception when property is not found");
        } catch (ConfigPropertyNotFoundException e) {

        @Override
        public Object evaluate(String template, Map<String, Object> paramMap) {
            if ("error".equals(template)) {
                // Simulate error by returning null
                return null;
            }
            return template;
        }
    }

    // Test helper class
    private static class TestUser {

        // Second immediate call should use cache
        names = testFactory.getDataStoreNames();
        assertEquals(2, names.length);
        assertEquals(1, loadCount[0]); // Should not increment

        // Simulate time passing (more than 60 seconds)
        testFactory.lastLoadedTime = System.currentTimeMillis() - 61000L;

        // Should reload after cache expiry
        names = testFactory.getDataStoreNames();

        // Test exception in a more complex scenario
        InvalidAccessTokenException exception = null;
        String expectedType = "Bearer";
        String expectedMessage = "Token has expired";

        // Simulate a token validation scenario
        boolean tokenValid = false;
        if (!tokenValid) {
            exception = new InvalidAccessTokenException(expectedType, expectedMessage);
        }

            this.output = output;
        }

        @Override
        public void start() {
            // Override start to do nothing in test - simulate immediate completion
        }

        @Override
        public void run() {
            // Override run to do nothing in test
        }

        @Override
        public String getOutput() {

```kotlin
val response = MockResponse.Builder()
  .addHeader("Content-Type", "application/json; charset=utf-8")
  .addHeader("Cache-Control", "no-cache")
  .body("{}")
  .build()
```

MockResponse can be used to simulate a slow network. This is useful for
testing timeouts and interactive testing.

### Java
```java
MockResponse response = new MockResponse.Builder()
    .throttleBody(1024, 1, TimeUnit.SECONDS)
    .build();

        assertTrue(outputStream instanceof ByteArrayOutputStream);
    }

    public void test_getXContentBuilderOutputStream_ioException() {
        XContentBuilderCallback callback = (builder, params) -> {
            // Simulate IOException by creating invalid state
            throw new IOException("Test exception");
        };

        OutputStream outputStream = SearchEngineUtil.getXContentBuilderOutputStream(callback, XContentType.JSON);

        final String tempPath = "/tmp/test.tmp";
        final String outputPath = "/tmp/output.jpg";

        // Simulate the variable replacement logic from the source code
        final List<String> processedCommands = new ArrayList<>();
        for (final String command : commands) {

        CharMappingItem item = new CharMappingItem(1L, new String[] { "temp" }, "output") {
            @Override
            public String getInputsValue() {
                // Simulate null inputs scenario
                if (getInputs() == null) {
                    return super.getInputsValue();
                }
                return super.getInputsValue();
            }
        };

        assertTrue(populatedString.contains("queryTime=500"));
        assertTrue(populatedString.contains("requestedTime=1000000"));
    }

    public void test_complexScenario() {
        // Simulate a typical search result scenario
        // Page 2 of search results with 10 items per page
        searchRenderData.setPageSize(10);
        searchRenderData.setCurrentPageNumber(2);