public int hashCode() {
    K k = getKey();
    V v = getValue();
    return ((k == null) ? 0 : k.hashCode()) ^ ((v == null) ? 0 : v.hashCode());
  }

  /** Returns a string representation of the form {@code {key}={value}}. */
  @Override
  public String toString() {
    return getKey() + "=" + getValue();
  }

public class JsonUtil {

    /**
     * Defualt constructor.
     */
    protected JsonUtil() {
    }

    /**
     * Escapes a value as Json string.
     *
     * @param value input
     * @return escaped string.
     */
    public static String escape(final String value) {
        if (value == null) {
            return null;
        }

        char c;
        final int len = value.length();

    public Map<String, String> getQueryMap() {
        return queryMap;
    }

    /**
     * Adds a query to the query map with the specified display key.
     *
     * @param key the display key for the query
     * @param query the query string to add
     */
    public void addQuery(final String key, final String query) {
        queryMap.put(key, query);
    }

    /**

    Future<?> second = serializer.submitAsync(secondCallable, directExecutor());
    assertThat(secondCallable.called).isFalse();
    assertThat(second.toString()).contains(secondCallable.toString());
    firstFuture.set(null);
    assertThat(second.toString()).contains(secondCallable.future.toString());
  }

  private static class BlockingCallable implements Callable<@Nullable Void> {

            }
        }
        return buffer.toString();
    }

    public MojoDescriptor getMojoDescriptor() {
        return mojo;
    }

    public List<Parameter> getParameters() {
        return parameters;
    }

    private static void decomposeParameterIntoUserInstructions(
            MojoDescriptor mojo, Parameter param, StringBuilder messageBuffer) {
        String expression = param.getExpression();

          <code>
            <![CDATA[
        public static final String USER_LEVEL = "user-level";
        public static final String GLOBAL_LEVEL = "global-level";

        private String sourceLevel = USER_LEVEL;
        private boolean sourceLevelSet = false;

        public void setSourceLevel(String sourceLevel) {
            if (sourceLevelSet) {

        } catch (IOException e) {
            throw new IllegalStateException("Failed to serialize toolchains to memory", e);
        }

        String serializedToolchains = stringWriter.toString();

        RegexBasedInterpolator interpolator = new RegexBasedInterpolator();

        try {
            interpolator.addValueSource(new EnvarBasedValueSource());
        } catch (IOException e) {

        assertEquals(0, msg.readBytesWireFormat(null, index));
    }

    @Test
    @DisplayName("toString formats correctly")
    void toStringFormatsCorrectly() {
        SmbComLogoffAndX msg = new SmbComLogoffAndX(null);
        String s = msg.toString();
        assertNotNull(s, "toString should not be null");
        assertTrue(s.startsWith("SmbComLogoffAndX["), "expected prefix " + "SmbComLogoffAndX[" + " but got " + s);

    assertThat(graph.edgeValueOrDefault(4, 4, DEFAULT)).isEqualTo("valueD");

    String toString = graph.toString();
    assertThat(toString).contains("valueA");
    assertThat(toString).contains("valueB");
    assertThat(toString).contains("valueC");
    assertThat(toString).contains("valueD");
  }

  @Test
  public void undirectedGraph() {

    }

    /**
     * Returns the string representation of the method signature.
     *
     * @param methodName
     *            The method name. Cannot be {@literal null} or empty
     * @param argTypes
     *            The argument types
     * @return The string representation of the method signature
     */
    public static String getSignature(final String methodName, final Class<?>... argTypes) {