});
        req.param("key1", "value1").param("key2", "value2");

        // ## Act ##
        try (CurlResponse response = req.execute()) {
            // ## Assert ##
            String urlStr = capturedUrl.get().toString();
            assertTrue("URL should contain ?key1=value1: " + urlStr, urlStr.contains("?key1=value1"));
            assertTrue("URL should contain &key2=value2: " + urlStr, urlStr.contains("&key2=value2"));

        source.put("TestKey", "value1");
        source.put("AnotherTestKey", "value2");

        Map<String, Object> nested = new HashMap<>();
        nested.put("NestedKey", "nestedValue");
        source.put("NestedMap", nested);

        Map<String, Object> result = searchLogHelper.toLowerHyphen(source);

        assertEquals("value1", result.get("test_key"));

    checkNotNull(value2);
    checkArgument(!Objects.equals(value1, value2), "Duplicate value provided.");
    distinctValues.replaceValues(type, ImmutableList.of(value1, value2));
    setDefault(type, value1);
    return this;
  }

  /**
   * Tests that {@code cls} properly checks null on all constructor and method parameters that
   * aren't annotated nullable (according to the rules of {@link NullPointerTester}). In details:
   *

    public void test_getFieldValues() throws Exception {
        Map<String, Object> document = new HashMap<>();
        document.put("string_field", "value1");
        document.put("string_array_field", new String[] { "value2", "value3" });
        document.put("list_field", java.util.Arrays.asList("value4", "value5"));
        document.put("int_field", 123);

        String[] stringValues = defaultContentsParser.getFieldValues(document, "string_field");

        // Create test data
        DataConfig config = new DataConfig();
        config.setName("test-config");

        DataStoreParams params = new DataStoreParams();
        params.put("key1", "value1");
        params.put("key2", "value2");

        IndexUpdateCallback callback = new TestIndexUpdateCallback();

        // Execute store method
        dataStore.store(config, callback, params);

        // Verify store was called

        return values;
    }

    /**
     * Returns a string representation of this RequestParameter.
     * The format includes the parameter name and its values in array format.
     *
     * @return a string representation of this object in the format "[name, [value1, value2, ...]]"
     */
    @Override
    public String toString() {
        return "[" + name + ", " + Arrays.toString(values) + "]";
    }

        });
  }

  public void testFinishToFuture_preventsFurtherDerivation() {
    ClosingFuture<String> closingFuture = ClosingFuture.from(immediateFuture("value1"));
    FluentFuture<String> unused = closingFuture.finishToFuture();
    assertDerivingThrowsIllegalStateException(closingFuture);
  }

  @Override

        StringBuilder buf = new StringBuilder();
        double[] values = {};
        Supplier<Object> supplier = () -> values;

        monitorTarget.append(buf, "emptyArrayKey", supplier);
        assertEquals("\"emptyArrayKey\":[]", buf.toString());
    }

    // Test append method with String value
    @Test
    public void test_append_stringValue() {
        StringBuilder buf = new StringBuilder();

        .add("\tkey\t:\tvalue\t") // '\t' also counts as whitespace
        .add("ping:  pong  ") // Value whitespace is trimmed.
        .add("kit:kat") // Space after colon is not required.
        .build()
    assertThat(headers.values("foo")).containsExactly("bar", "baz", "bak")
    assertThat(headers.values("key")).containsExactly("value")
    assertThat(headers.values("ping")).containsExactly("pong")

        request.setParameterValues("test", new String[] { "value1", "value2", "value1" });
        String[] result = SearchRequestParams.getParamValueArray(request, "test");
        assertEquals(2, result.length);
        assertEquals("value1", result[0]);
        assertEquals("value2", result[1]);
    }

    @Test
    public void test_getParamValueArray_withNullParam() {