diff --git a/tests/phpunit/tests/customize/widgets.php b/tests/phpunit/tests/customize/widgets.php
index b5abb2dab73ad..68d8945874bc1 100644
--- a/tests/phpunit/tests/customize/widgets.php
+++ b/tests/phpunit/tests/customize/widgets.php
@@ -436,7 +436,7 @@ function test_wp_widget_form_customize_control_json() {
 		$this->assertArrayHasKey( 'sidebar_id', $params );
 		$this->assertArrayHasKey( 'width', $params );
 		$this->assertArrayHasKey( 'height', $params );
-		$this->assertInternalType( 'bool', $params['is_wide'] );
+		$this->assertIsBool( $params['is_wide'] );
 	}
 
 	/**
diff --git a/tests/phpunit/tests/rest-api/rest-post-meta-fields.php b/tests/phpunit/tests/rest-api/rest-post-meta-fields.php
index cd73a83e22517..ae2a13ace6db3 100644
--- a/tests/phpunit/tests/rest-api/rest-post-meta-fields.php
+++ b/tests/phpunit/tests/rest-api/rest-post-meta-fields.php
@@ -403,7 +403,7 @@ public function test_get_value_types() {
 		$this->assertSame( 42.0, $meta['test_number'] );
 
 		$this->assertArrayHasKey( 'test_bool', $meta );
-		$this->assertInternalType( 'boolean', $meta['test_bool'] );
+		$this->assertIsBool( $meta['test_bool'] );
 		$this->assertSame( true, $meta['test_bool'] );
 	}
 
diff --git a/tests/phpunit/tests/rest-api/rest-term-meta-fields.php b/tests/phpunit/tests/rest-api/rest-term-meta-fields.php
index 9e882e9bd1d30..c99a9092eef1f 100644
--- a/tests/phpunit/tests/rest-api/rest-term-meta-fields.php
+++ b/tests/phpunit/tests/rest-api/rest-term-meta-fields.php
@@ -350,7 +350,7 @@ public function test_get_value_types() {
 		$this->assertSame( 42.0, $meta['test_number'] );
 
 		$this->assertArrayHasKey( 'test_bool', $meta );
-		$this->assertInternalType( 'boolean', $meta['test_bool'] );
+		$this->assertIsBool( $meta['test_bool'] );
 		$this->assertSame( true, $meta['test_bool'] );
 	}
 
diff --git a/tests/phpunit/tests/xmlrpc/mw/getPost.php b/tests/phpunit/tests/xmlrpc/mw/getPost.php
index 2c9c66039b719..2877b1da7eb29 100644
--- a/tests/phpunit/tests/xmlrpc/mw/getPost.php
+++ b/tests/phpunit/tests/xmlrpc/mw/getPost.php
@@ -72,7 +72,7 @@ function test_valid_post() {
 		$this->assertInternalType( 'string', $result['post_status'] );
 		$this->assertIsArray( $result['custom_fields'] );
 		$this->assertInternalType( 'string', $result['wp_post_format'] );
-		$this->assertInternalType( 'bool', $result['sticky'] );
+		$this->assertIsBool( $result['sticky'] );
 
 		$post_data = get_post( self::$post_id );
 
diff --git a/tests/phpunit/tests/xmlrpc/wp/deleteTerm.php b/tests/phpunit/tests/xmlrpc/wp/deleteTerm.php
index 40601246c22b2..3c0a14f431726 100644
--- a/tests/phpunit/tests/xmlrpc/wp/deleteTerm.php
+++ b/tests/phpunit/tests/xmlrpc/wp/deleteTerm.php
@@ -70,6 +70,6 @@ function test_term_deleted() {
 
 		$result = $this->myxmlrpcserver->wp_deleteTerm( array( 1, 'editor', 'editor', 'category', self::$term_id ) );
 		$this->assertNotIXRError( $result );
-		$this->assertInternalType( 'boolean', $result );
+		$this->assertIsBool( $result );
 	}
 }
diff --git a/tests/phpunit/tests/xmlrpc/wp/editTerm.php b/tests/phpunit/tests/xmlrpc/wp/editTerm.php
index bea3dde304c18..94b72ab7a3ad8 100644
--- a/tests/phpunit/tests/xmlrpc/wp/editTerm.php
+++ b/tests/phpunit/tests/xmlrpc/wp/editTerm.php
@@ -155,7 +155,7 @@ function test_parent_null() {
 		);
 
 		$this->assertNotIXRError( $result );
-		$this->assertInternalType( 'boolean', $result );
+		$this->assertIsBool( $result );
 
 		$term = get_term( self::$child_term, 'category' );
 		$this->assertEquals( '0', $term->parent );
@@ -236,7 +236,7 @@ function test_edit_all_fields() {
 		$result = $this->myxmlrpcserver->wp_editTerm( array( 1, 'editor', 'editor', self::$child_term, $fields ) );
 
 		$this->assertNotIXRError( $result );
-		$this->assertInternalType( 'boolean', $result );
+		$this->assertIsBool( $result );
 	}
 
 	/**
diff --git a/tests/phpunit/tests/xmlrpc/wp/getPost.php b/tests/phpunit/tests/xmlrpc/wp/getPost.php
index 06fa1e47418f7..c3c0f5d63f048 100644
--- a/tests/phpunit/tests/xmlrpc/wp/getPost.php
+++ b/tests/phpunit/tests/xmlrpc/wp/getPost.php
@@ -58,7 +58,7 @@ function test_valid_post() {
 		$this->assertInternalType( 'string', $result['link'] );
 		$this->assertInternalType( 'string', $result['comment_status'] );
 		$this->assertInternalType( 'string', $result['ping_status'] );
-		$this->assertInternalType( 'bool', $result['sticky'] );
+		$this->assertIsBool( $result['sticky'] );
 		$this->assertInternalType( 'string', $result['post_format'] );
 		$this->assertIsArray( $result['post_thumbnail'] );
 		$this->assertIsArray( $result['custom_fields'] );
diff --git a/tests/phpunit/tests/xmlrpc/wp/getPostType.php b/tests/phpunit/tests/xmlrpc/wp/getPostType.php
index 5c126e67a34e5..5ba177db88a1e 100644
--- a/tests/phpunit/tests/xmlrpc/wp/getPostType.php
+++ b/tests/phpunit/tests/xmlrpc/wp/getPostType.php
@@ -67,12 +67,12 @@ function test_valid_type() {
 		// Check data types.
 		$this->assertInternalType( 'string', $result['name'] );
 		$this->assertInternalType( 'string', $result['label'] );
-		$this->assertInternalType( 'bool', $result['hierarchical'] );
-		$this->assertInternalType( 'bool', $result['public'] );
-		$this->assertInternalType( 'bool', $result['_builtin'] );
-		$this->assertInternalType( 'bool', $result['map_meta_cap'] );
-		$this->assertInternalType( 'bool', $result['has_archive'] );
-		$this->assertInternalType( 'bool', $result['show_ui'] );
+		$this->assertIsBool( $result['hierarchical'] );
+		$this->assertIsBool( $result['public'] );
+		$this->assertIsBool( $result['_builtin'] );
+		$this->assertIsBool( $result['map_meta_cap'] );
+		$this->assertIsBool( $result['has_archive'] );
+		$this->assertIsBool( $result['show_ui'] );
 		$this->assertInternalType( 'int', $result['menu_position'] );
 		$this->assertInternalType( 'string', $result['menu_icon'] );
 		$this->assertIsArray( $result['labels'] );
@@ -120,7 +120,7 @@ function test_valid_type() {
 		// Check support data types.
 		foreach ( $result['supports'] as $key => $value ) {
 			$this->assertInternalType( 'string', $key );
-			$this->assertInternalType( 'bool', $value );
+			$this->assertIsBool( $value );
 		}
 
 		// Check expected values.