assertBad(spec);
    }
  }

  public void testEquality() {
    new EqualsTester()
        .addEqualityGroup(spec("1.2.3.4"), spec("1.2.3.4"))
        .addEqualityGroup(spec("2001:db8::1"), spec("2001:db8::1"), spec("[2001:db8::1]"))
        .addEqualityGroup(spec("2001:db8::2"))
        .addEqualityGroup(spec("google.com"), spec("google.com"))
        .addEqualityGroup(spec("www.google.com"))
        .testEquals();
  }

And the spec says that the fields have to be named like that. So `user-name` or `email` wouldn't work.

But don't worry, you can show it as you wish to your final users in the frontend.

And your database models can use any other names you want.

     *
     * @param spec
     *            A string to be parsed as a <code>URL</code>. Must not be {@literal null} or empty.
     * @return A <code>URL</code> object.
     */
    public static URL create(final String spec) {
        assertArgumentNotEmpty("spec", spec);

        try {
            return new URL(spec);
        } catch (final IOException e) {

    protected void parseURL(final URL u, String spec, final int start, int limit) {
        final String host = u.getHost();
        String path, ref;
        int port;

        if (spec.equals("smb1://")) {
            spec = "smb1:////";
            limit += 2;
        } else if (!spec.startsWith("smb1://") && host != null && host.length() == 0) {
            spec = "//" + spec;
            limit += 2;
        }

    @Override
    protected void parseURL(final URL u, String spec, final int start, int limit) {
        final String host = u.getHost();
        String path, ref;
        int port;

        if (spec.equals("smb://")) {
            spec = "smb:////";
            limit += 2;
        } else if (!spec.startsWith("smb://") && host != null && host.length() == 0) {
            spec = "//" + spec;
            limit += 2;
        }

        boolean lowerBoundInclusive = spec.startsWith("[");
        boolean upperBoundInclusive = spec.endsWith("]");

        String process = spec.substring(1, spec.length() - 1).trim();

        Restriction restriction;

        int index = process.indexOf(',');

        if (index < 0) {
            if (!lowerBoundInclusive || !upperBoundInclusive) {

        public void addArtifact(ArtifactSpec spec) {
            artifacts.put(getKey(spec.artifact), spec);

            String key = spec.artifact.getDependencyConflictId();
            List<ArtifactVersion> artifactVersions = versions.computeIfAbsent(key, k -> new ArrayList<>());
            if (spec.artifact.getVersion() != null) {
                artifactVersions.add(new DefaultArtifactVersion(spec.artifact.getVersion()));
            }

        // Based on the test output, the actual path is "/bar" when parsing relative spec "foo/bar"
        // This happens because the URL class parses "foo" as the host and "/bar" as the path
        assertEquals("/bar", actualPath, "Path should be /bar after URL parsing");
        assertEquals("foo", rel.getHost(), "Host should be 'foo' from the relative spec");
        assertNull(rel.getRef());
    }

        final URL url = new URL(null, "zip:/Program Files/foo.zip!/", new URLStreamHandler() {
            @Override
            protected void parseURL(final URL u, final String spec, final int start, final int limit) {
                setURL(u, "zip", null, 0, null, null, spec.substring(4), null, null);
            }

            @Override
            protected URLConnection openConnection(final URL u) throws IOException {

    TestSubtype spec = method.getAnnotation(TestSubtype.class);
    assertWithMessage("%s is subtype of %s", paramType, returnType)
        .that(TypeToken.of(paramType).isSubtypeOf(returnType))
        .isTrue();
    assertWithMessage("%s is supertype of %s", returnType, paramType)
        .that(TypeToken.of(returnType).isSupertypeOf(paramType))
        .isTrue();
    if (!spec.suppressGetSubtype()) {