Index: tests/phpunit/tests/post/types.php
===================================================================
--- tests/phpunit/tests/post/types.php	(revision 36767)
+++ tests/phpunit/tests/post/types.php	(working copy)
@@ -4,6 +4,26 @@
  * @group post
  */
 class Tests_Post_Types extends WP_UnitTestCase {
+
+	/**
+	 * Post type.
+	 *
+	 * @since 4.5.0
+	 * @var string
+	 */
+	public $post_type;
+
+	/**
+	 * Set up.
+	 *
+	 * @since 4.5.0
+	 */
+	function setUp() {
+		parent::setUp();
+
+		$this->post_type = rand_str( 20 );
+	}
+
 	function test_register_post_type() {
 		$this->assertNull( get_post_type_object( 'foo' ) );
 		register_post_type( 'foo' );
@@ -39,6 +59,103 @@
 		$this->assertInstanceOf( 'WP_Error', register_post_type( '' ) );
 	}
 
+	/**
+	 * @ticket 35985
+	 * @covers register_post_type()
+	 */
+	function test_register_post_type_exclude_from_search_should_default_to_opposite_value_of_public() {
+		/*
+		 * 'public'              Default is false
+		 * 'exclude_from_search' Default is null (opposite 'public')
+		 */
+		$args = $this->register_post_type( array( 'public' => $public = false ) );
+
+		$this->assertNotEquals( $public, $args->exclude_from_search );
+	}
+
+	/**
+	 * @ticket 35985
+	 * @covers register_post_type()
+	 */
+	function test_register_post_type_publicly_queryable_should_default_to_value_of_public() {
+		/*
+		 * 'public'             Default is false
+		 * 'publicly_queryable' Default is null ('public')
+		 */
+		$args = $this->register_post_type( array( 'public' => $public = false ) );
+
+		$this->assertSame( $public, $args->publicly_queryable );
+	}
+
+	/**
+	 * @ticket 35985
+	 * @covers register_post_type()
+	 */
+	function test_register_post_type_show_ui_should_default_to_value_of_public() {
+		/*
+		 * 'public'  Default is false
+		 * 'show_ui' Default is null ('public')
+		 */
+		$args = $this->register_post_type( array( 'public' => $public = false ) );
+
+		$this->assertSame( $public, $args->show_ui );
+	}
+
+	/**
+	 * @ticket 35985
+	 * @covers register_post_type()
+	 */
+	function test_register_post_type_show_in_menu_should_default_to_value_of_show_ui() {
+		/*
+		 * 'public'      Default is false
+		 * 'show_ui'     Default is null ('public')
+		 * 'show_in_menu Default is null ('show_ui' > 'public')
+		 */
+		$args = $this->register_post_type( array( 'public' => $public = false ) );
+
+		// Should fall back to 'show_ui'.
+		$this->assertSame( $args->show_ui, $args->show_in_menu );
+
+		// Should fall back to 'show_ui', then 'public'.
+		$this->assertSame( $public, $args->show_in_menu );
+	}
+
+	/**
+	 * @ticket 35985
+	 * @covers register_post_type()
+	 */
+	function test_register_post_type_show_in_nav_menus_should_default_to_value_of_public() {
+		/*
+		 * 'public'            Default is false
+		 * 'show_in_nav_menus' Default is null ('public')
+		 */
+		$args = $this->register_post_type( array( 'public' => $public = false ) );
+
+		$this->assertSame( $public, $args->show_in_nav_menus );
+	}
+
+	/**
+	 * @ticket 35985
+	 * @covers register_post_type()
+	 */
+	function test_register_post_type_show_in_admin_bar_should_default_to_value_of_show_in_menu() {
+		/*
+		 * 'public'            Default is false
+		 * 'show_in_menu'      Default is null ('show_ui' > 'public')
+		 * 'show_in_admin_bar' Default is null ('show_in_menu' > 'show_ui' > 'public')
+		 */
+		$args = $this->register_post_type( array( 'public' => $public = false ) );
+
+		// Should fall back to 'show_in_menu'.
+		$this->assertSame( $args->show_in_menu, $args->show_in_admin_bar );
+
+		// Should fall back to 'show_ui'.
+		$this->assertSame( $args->show_ui, $args->show_in_admin_bar );
+
+		// Should fall back to 'public'.
+		$this->assertSame( $public, $args->show_in_admin_bar );
+	}
+
 	function test_register_taxonomy_for_object_type() {
 		global $wp_taxonomies;
 
@@ -428,4 +545,19 @@
 	public function test_get_post_types_by_support_non_existant_feature() {
 		$this->assertEqualSets( array(), get_post_types_by_support( 'somefeature' ) );
 	}
+
+	/**
+	 * Serves as a helper to register a post type for tests.
+	 *
+	 * Uses `$this->post_type` initialized in setUp().
+	 *
+	 * @since 4.5.0
+	 *
+	 * @param array $args register_post_type() arguments.
+	 * @return stdClass Post type object for `$this->post_type`.
+	 */
+	public function register_post_type( $args = array() ) {
+		register_post_type( $this->post_type, $args );
+		return get_post_type_object( $this->post_type );
+	}
 }