int hash = 17;
        hash = hash * 31 + patterns.hashCode();

        return hash;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }

        // make sure IncludesArtifactFilter is not equal ExcludesArtifactFilter!
        if (obj == null || getClass() != obj.getClass()) {
            return false;
        }

    @SuppressWarnings("EqualsHashCode")
    @Override
    public boolean equals(@Nullable Object other) {
      return (other instanceof ClassWhichIsAlwaysEqualButHasDifferentHashcodes);
    }
  }

  private static class ObjectWhichIsEqualButChangesClass implements Serializable {
    private static final long serialVersionUID = 1L;

    @Override
    public boolean equals(@Nullable Object other) {

        if (!pluginArtifact.getGroupId().equals(pluginDescriptor.getGroupId())) {
            errors.add("Plugin's descriptor contains the wrong group ID: " + pluginDescriptor.getGroupId());
        }

        if (!pluginArtifact.getArtifactId().equals(pluginDescriptor.getArtifactId())) {

            @Override
            public boolean equals(Object o) {
                return o instanceof DefaultSettingsBuilderRequest that
                        && Objects.equals(installationSettingsSource, that.installationSettingsSource)
                        && Objects.equals(projectSettingsSource, that.projectSettingsSource)
                        && Objects.equals(userSettingsSource, that.userSettingsSource)

    }

    @Override
    public int hashCode() {
        return name.hashCode();
    }

    @Override
    public boolean equals(Object other) {
        return (other instanceof Parameter parameter) && getName().equals(parameter.getName());
    }

    public String getAlias() {
        return alias;
    }

    public void setAlias(String alias) {
        this.alias = alias;

        if (startWith != null) {
            Xpp3Dom startWithNode = (Xpp3Dom) startWith.getNode();
            for (; filteredIndex < children.size(); filteredIndex++) {
                if (startWithNode.equals(children.get(filteredIndex))) {
                    filteredIndex++;
                    break;
                }
            }
        }
        this.test = test;
        if (reverse) {

            validateStringNotEmpty(
                    "parent.version", problems, Severity.FATAL, Version.BASE, parent.getVersion(), parent);

            if (equals(parent.getGroupId(), m.getGroupId()) && equals(parent.getArtifactId(), m.getArtifactId())) {
                addViolation(
                        problems,
                        Severity.FATAL,
                        Version.BASE,

    }

    @Test
    void testEqualsNullSafe() {
        assertFalse(new Relocation().equals(null));

        new Relocation().equals(new Relocation());
    }

    @Test
    void testEqualsIdentity() {
        Relocation thing = new Relocation();
        assertTrue(thing.equals(thing), "Expected " + thing + " to equal " + thing);
    }

    @Test
    void testToStringNullSafe() {

    }

    @Test
    void testEqualsNullSafe() {
        assertFalse(new Contributor().equals(null));

        new Contributor().equals(new Contributor());
    }

    @Test
    void testEqualsIdentity() {
        Contributor thing = new Contributor();
        assertTrue(thing.equals(thing), "Expected " + thing + " to equal " + thing);
    }

    @Test
    void testToStringNullSafe() {

    }

    @Test
    void testEqualsNullSafe() {
        assertFalse(new Extension().equals(null));

        new Extension().equals(new Extension());
    }

    @Test
    void testEqualsIdentity() {
        Extension thing = new Extension();
        assertTrue(thing.equals(thing), "Expected " + thing + " to equal " + thing);
    }

    @Test
    void testToStringNullSafe() {