diff --git a/tests/phpunit/tests/post/nav-menu.php b/tests/phpunit/tests/post/nav-menu.php
index 3f82ed999c..3153853159 100644
--- a/tests/phpunit/tests/post/nav-menu.php
+++ b/tests/phpunit/tests/post/nav-menu.php
@@ -551,22 +551,22 @@ class Tests_Post_Nav_Menu extends WP_UnitTestCase {
 	 * Run tests required to confrim Walker_Nav_Menu receives an $args object.
 	 */
 	function _confirm_nav_menu_item_args_object( $args ) {
-		$this->assertTrue( is_object( $args ) );
+		$this->assertIsObject( $args );
 		return $args;
 	}
 
 	function _confirm_second_param_args_object( $ignored_1, $args ) {
-		$this->assertTrue( is_object( $args ) );
+		$this->assertIsObject( $args );
 		return $ignored_1;
 	}
 
 	function _confirm_third_param_args_object( $ignored_1, $ignored_2, $args ) {
-		$this->assertTrue( is_object( $args ) );
+		$this->assertIsObject( $args );
 		return $ignored_1;
 	}
 
 	function _confirm_forth_param_args_object( $ignored_1, $ignored_2, $ignored_3, $args ) {
-		$this->assertTrue( is_object( $args ) );
+		$this->assertIsObject( $args );
 		return $ignored_1;
 	}
 
diff --git a/tests/phpunit/tests/taxonomy.php b/tests/phpunit/tests/taxonomy.php
index d008840238..803419bf32 100644
--- a/tests/phpunit/tests/taxonomy.php
+++ b/tests/phpunit/tests/taxonomy.php
@@ -27,7 +27,7 @@ class Tests_Taxonomy extends WP_UnitTestCase {
 		foreach ( get_object_taxonomies( 'post' ) as $taxonomy ) {
 			$tax = get_taxonomy( $taxonomy );
 			// Should return an object with the correct taxonomy object type.
-			$this->assertTrue( is_object( $tax ) );
+			$this->assertIsObject( $tax );
 			$this->assertIsArray( $tax->object_type );
 			$this->assertSame( array( 'post' ), $tax->object_type );
 		}
@@ -109,7 +109,7 @@ class Tests_Taxonomy extends WP_UnitTestCase {
 		foreach ( get_object_taxonomies( 'link' ) as $taxonomy ) {
 			$tax = get_taxonomy( $taxonomy );
 			// Should return an object with the correct taxonomy object type.
-			$this->assertTrue( is_object( $tax ) );
+			$this->assertIsObject( $tax );
 			$this->assertIsArray( $tax->object_type );
 			$this->assertSame( array( 'link' ), $tax->object_type );
 		}