static final Predicate<Entry<String, Integer>> CORRECT_LENGTH =
      input -> input.getKey().length() == input.getValue();

  abstract Map<String, Integer> createUnfiltered();

  public void testFilteredKeysIllegalPut() {
    Map<String, Integer> unfiltered = createUnfiltered();
    Map<String, Integer> filtered = Maps.filterKeys(unfiltered, NOT_LENGTH_3);
    filtered.put("a", 1);
    filtered.put("b", 2);

    }

    /**
     * Registers a value in the render data with the specified key.
     * If the value is an Entity object, it will be converted to a Map using BeanUtil.
     * If the value is a Collection containing Entity objects, each Entity will be converted to a Map.
     * For other types of values, they are registered directly.
     *
     * @param data the RenderData object to register the value in

    /**
     * Constructs KerberosRelevantAuthData from token bytes.
     *
     * @param token the authorization data token
     * @param keys map of Kerberos keys indexed by key type
     * @throws PACDecodingException if decoding fails
     */
    public KerberosRelevantAuthData(byte[] token, Map<Integer, KerberosKey> keys) throws PACDecodingException {
        ASN1Sequence authSequence;
        try {

    private List<ArtifactTransformation> artifactTransformations;

    @Inject
    public DefaultArtifactTransformationManager(Map<String, ArtifactTransformation> artifactTransformations) {
        this.artifactTransformations = Stream.of("release", "latest", "snapshot")
                .map(artifactTransformations::get)
                .filter(Objects::nonNull)
                .collect(Collectors.toList());
    }

    @Override

        assertEquals("bar", fieldConfigs.getConfig("foo").map(FieldConfigs.Config::getValues).orElse(new String[0])[0]);
    }

    public void test_cache_true() {
        final Map<String, String> params = Maps.of("foo", "true");
        FieldConfigs fieldConfigs = new FieldConfigs(params);
        assertTrue(fieldConfigs.getConfig("test").isEmpty());

    #; overrideMap = map:{
    #    ; fess.freeGen.mail.targetDir = ./playsql/data/mail
    #}

    # you can adjust LastaDoc contents
    ; lastaDocContentsMap = map:{
        ; headerMap = map:{
            #; isSuppressSchemaHtmlLink = true
        }
        ; actionMap = map:{
            ; isSuppressDescriptionInList = true
            ; isSuppressAuthorInList = true
        }

    assertEquals("[" + JOINER.join(map.keySet()) + "]", map.keySet().toString());
    assertEquals("[" + JOINER.join(map.values()) + "]", map.values().toString());

    assertEquals(new HashSet<>(map.entrySet()), map.entrySet());
    assertEquals(new HashSet<>(map.keySet()), map.keySet());
  }

      }
    }
  }

  /**
   * Returns an immutable map containing the same entries as {@code map}. If {@code map} somehow
   * contains entries with duplicate keys (for example, if it is a {@code SortedMap} whose
   * comparator is not <i>consistent with equals</i>), the results of this method are undefined.
   *
   * <p><b>Note:</b> Despite what the method name suggests, if {@code map} is an {@code

    assertNull(map.get(Long.class));
    assertNull(map.getInstance(Long.class));
  }

  public void testPrimitiveAndWrapper() {
    assertNull(map.getInstance(int.class));
    assertNull(map.getInstance(Integer.class));

    assertNull(map.putInstance(int.class, 0));
    assertNull(map.putInstance(Integer.class, 1));
    assertEquals(2, map.size());

    assertEquals(0, (int) map.getInstance(int.class));

        assertThat(map.isEmpty(), is(false));
        assertThat(map.get(Foo.class.getTypeParameters()[0]), is(sameClass(Object.class)));
    }

    /**
     * @throws Exception
     */
    public void testGenericMethod() throws Exception {
        final Map<TypeVariable<?>, Type> map = GenericsUtil.getTypeVariableMap(Fuga.class);
        assertThat(map, is(notNullValue()));
        assertThat(map.isEmpty(), is(true));