validator.validate(settings, problems);
        assertEquals(1, problems.messages.size());
        assertContains(
                problems.messages.get(0), "'servers.server.id' must be unique but found duplicate server with id test");
    }

    @Test
    void testValidateUniqueProfileId() throws Exception {
        Settings settings = new Settings();
        Profile profile1 = new Profile();

func TestGetMissingSiteNames(t *testing.T) {
	testCases := []struct {
		currSites []madmin.PeerInfo
		oldDepIDs set.StringSet
		newDepIDs set.StringSet
		expNames  []string
	}{
		// Test1: missing some sites in replicated setup
		{
			[]madmin.PeerInfo{
				{Endpoint: "minio1:9000", Name: "minio1", DeploymentID: "dep1"},
				{Endpoint: "minio2:9000", Name: "minio2", DeploymentID: "dep2"},

        SimpleProblemCollector result = validateRaw("duplicate-plugin.xml");

        assertViolations(result, 0, 4, 0);

        assertTrue(result.getErrors().get(0).contains("duplicate declaration of plugin test:duplicate"));
        assertTrue(result.getErrors().get(1).contains("duplicate declaration of plugin test:managed-duplicate"));
        assertTrue(result.getErrors().get(2).contains("duplicate declaration of plugin profile:duplicate"));

	return fmt.Sprintf("invalid filter value '%v'", err.FilterValue)
}

// ErrDuplicateEventName - duplicate event name error.
type ErrDuplicateEventName struct {
	EventName Name
}

func (err ErrDuplicateEventName) Error() string {
	return fmt.Sprintf("duplicate event name '%v' found", err.EventName)
}

// ErrUnsupportedConfiguration - unsupported configuration error.

type And struct {
	XMLName xml.Name `xml:"And" json:"And"`
	Prefix  string   `xml:"Prefix,omitempty" json:"Prefix,omitempty"`
	Tags    []Tag    `xml:"Tag,omitempty" json:"Tag,omitempty"`
}

var errDuplicateTagKey = Errorf("Duplicate Tag Keys are not allowed")

// isEmpty returns true if Tags field is null
func (a And) isEmpty() bool {
	return len(a.Tags) == 0 && a.Prefix == ""
}

// Validate - validates the And field

   *
   * @throws IllegalArgumentException if duplicate keys are provided
   */
  public static <K, V> ImmutableMap<K, V> of(K k1, V v1, K k2, V v2) {
    return RegularImmutableMap.fromEntries(entryOf(k1, v1), entryOf(k2, v2));
  }

  /**
   * Returns an immutable map containing the given entries, in order.
   *
   * @throws IllegalArgumentException if duplicate keys are provided
   */

            .suppressing(SetCreationTester.class.getMethods())
            // BiMap.entrySet() duplicate-handling behavior is too confusing for SetCreationTester
            .withSetUp(parentBuilder.getSetUp())
            .withTearDown(parentBuilder.getTearDown())
            .createTestSuite());
    /*
     * TODO(cpovirk): the Map tests duplicate most of this effort by using a

///

## Duplicate headers

It is possible to receive duplicate headers. That means, the same header with multiple values.

You can define those cases using a list in the type declaration.

You will receive all the values from the duplicate header as a Python `list`.

     * and will cause {@link #build} to fail.
     */
    @CanIgnoreReturnValue
    public <T extends B> Builder<B> put(Class<T> key, T value) {
      mapBuilder.put(key, value);
      return this;
    }

    /**
     * Associates all of {@code map's} keys and values in the built map. Duplicate keys are not

     * will throw an exception if there are duplicate key pairs. The {@code build()} method will
     * soon be deprecated.
     *
     * @throws IllegalArgumentException if duplicate key pairs were added
     */
    public ImmutableTable<R, C, V> build() {
      return buildOrThrow();
    }

    /**
     * Returns a newly-created immutable table, or throws an exception if duplicate key pairs were
     * added.
     *