diff --git a/phpunit/tests/fonts/font-library/fontFamilyBackwardsCompatibility.php b/phpunit/tests/fonts/font-library/fontFamilyBackwardsCompatibility.php
index 4305237d53292f..dc720b6b7db701 100644
--- a/phpunit/tests/fonts/font-library/fontFamilyBackwardsCompatibility.php
+++ b/phpunit/tests/fonts/font-library/fontFamilyBackwardsCompatibility.php
@@ -11,7 +11,7 @@
  * @group font-library
  */
 class Tests_Font_Family_Backwards_Compatibility extends WP_UnitTestCase {
-	private $post_ids_to_delete = array();
+	private $post_ids_to_delete;
 
 	public function set_up() {
 		parent::set_up();
diff --git a/phpunit/tests/fonts/font-library/wpFontCollection/loadFromJson.php b/phpunit/tests/fonts/font-library/wpFontCollection/loadFromJson.php
index 6c7b3bd23a6f3e..cf9ba7faa93f19 100644
--- a/phpunit/tests/fonts/font-library/wpFontCollection/loadFromJson.php
+++ b/phpunit/tests/fonts/font-library/wpFontCollection/loadFromJson.php
@@ -105,7 +105,7 @@ public function mock_request( $preempt, $args, $url ) {
 		}
 
 		return array(
-			'body'     => json_encode( self::$mock_collection_data ),
+			'body'     => wp_json_encode( self::$mock_collection_data ),
 			'response' => array(
 				'code' => 200,
 			),
@@ -122,7 +122,7 @@ public function mock_request_missing_slug( $preempt, $args, $url ) {
 		unset( $mock_collection_data['slug'] );
 
 		return array(
-			'body'     => json_encode( $mock_collection_data ),
+			'body'     => wp_json_encode( $mock_collection_data ),
 			'response' => array(
 				'code' => 200,
 			),
diff --git a/phpunit/tests/fonts/font-library/wpFontLibrary/getFontCollections.php b/phpunit/tests/fonts/font-library/wpFontLibrary/getFontCollections.php
index 1b17e7070454eb..394c977799a068 100644
--- a/phpunit/tests/fonts/font-library/wpFontLibrary/getFontCollections.php
+++ b/phpunit/tests/fonts/font-library/wpFontLibrary/getFontCollections.php
@@ -26,7 +26,7 @@ public function test_should_get_mock_font_collection() {
 		WP_Font_Library::register_font_collection( 'my-font-collection', $my_font_collection_config );
 
 		$font_collections = WP_Font_Library::get_font_collections();
-		$this->assertNotEmpty( $font_collections, 'Sould return an array of font collections.' );
+		$this->assertNotEmpty( $font_collections, 'Should return an array of font collections.' );
 		$this->assertCount( 1, $font_collections, 'Should return an array with one font collection.' );
 		$this->assertArrayHasKey( 'my-font-collection', $font_collections, 'The array should have the key of the registered font collection id.' );
 		$this->assertInstanceOf( 'WP_Font_Collection', $font_collections['my-font-collection'], 'The value of the array $font_collections[id] should be an instance of WP_Font_Collection class.' );
diff --git a/phpunit/tests/fonts/font-library/wpFontLibrary/unregisterFontCollection.php b/phpunit/tests/fonts/font-library/wpFontLibrary/unregisterFontCollection.php
index 423a2cdf9550c6..9546d0082eff92 100644
--- a/phpunit/tests/fonts/font-library/wpFontLibrary/unregisterFontCollection.php
+++ b/phpunit/tests/fonts/font-library/wpFontLibrary/unregisterFontCollection.php
@@ -33,7 +33,7 @@ public function test_should_unregister_font_collection() {
 	}
 
 	public function unregister_non_existing_collection() {
-		// Unregisters non existing font collection.
+		// Unregisters non-existing font collection.
 		WP_Font_Library::unregister_font_collection( 'non-existing-collection' );
 		$collections = WP_Font_Library::get_font_collections();
 		$this->assertEmpty( $collections, 'Should not be registered collections.' );
diff --git a/phpunit/tests/fonts/font-library/wpRestFontCollectionsController.php b/phpunit/tests/fonts/font-library/wpRestFontCollectionsController.php
index e6143da6da6464..823066c9478af1 100644
--- a/phpunit/tests/fonts/font-library/wpRestFontCollectionsController.php
+++ b/phpunit/tests/fonts/font-library/wpRestFontCollectionsController.php
@@ -49,8 +49,8 @@ public function test_register_routes() {
 		$this->assertCount( 1, $routes['/wp/v2/font-collections'], 'Rest server has not the collections path initialized.' );
 		$this->assertCount( 1, $routes['/wp/v2/font-collections/(?P<slug>[\/\w-]+)'], 'Rest server has not the collection path initialized.' );
 
-		$this->assertArrayHasKey( 'GET', $routes['/wp/v2/font-collections'][0]['methods'], 'Rest server has not the GET method for collections intialized.' );
-		$this->assertArrayHasKey( 'GET', $routes['/wp/v2/font-collections/(?P<slug>[\/\w-]+)'][0]['methods'], 'Rest server has not the GET method for collection intialized.' );
+		$this->assertArrayHasKey( 'GET', $routes['/wp/v2/font-collections'][0]['methods'], 'Rest server has not the GET method for collections initialized.' );
+		$this->assertArrayHasKey( 'GET', $routes['/wp/v2/font-collections/(?P<slug>[\/\w-]+)'][0]['methods'], 'Rest server has not the GET method for collection initialized.' );
 	}
 
 	/**
diff --git a/phpunit/tests/fonts/font-library/wpRestFontFacesController.php b/phpunit/tests/fonts/font-library/wpRestFontFacesController.php
index de6ecc3d735146..3067e485822c87 100644
--- a/phpunit/tests/fonts/font-library/wpRestFontFacesController.php
+++ b/phpunit/tests/fonts/font-library/wpRestFontFacesController.php
@@ -386,12 +386,12 @@ public function test_create_item() {
 		$settings = $data['font_face_settings'];
 		unset( $settings['src'] );
 		$this->assertSame(
-			$settings,
 			array(
 				'fontFamily' => '"Open Sans"',
 				'fontWeight' => '200',
 				'fontStyle'  => 'normal',
 			),
+			$settings,
 			'The font_face_settings data should match the expected data.'
 		);
 
@@ -730,14 +730,14 @@ public function test_create_item_invalid_file_src() {
 	}
 
 	/**
-	 * @dataProvider data_create_item_santize_font_family
+	 * @dataProvider data_create_item_sanitize_font_family
 	 *
 	 * @covers WP_REST_Font_Face_Controller::sanitize_font_face_settings
 	 *
 	 * @param string $font_family_setting Setting to test.
 	 * @param string $expected            Expected result.
 	 */
-	public function test_create_item_santize_font_family( $font_family_setting, $expected ) {
+	public function test_create_item_sanitize_font_family( $font_family_setting, $expected ) {
 		$settings = array_merge( self::$default_settings, array( 'fontFamily' => $font_family_setting ) );
 
 		wp_set_current_user( self::$admin_id );
@@ -755,7 +755,7 @@ public function test_create_item_santize_font_family( $font_family_setting, $exp
 	 *
 	 * @return array
 	 */
-	public function data_create_item_santize_font_family() {
+	public function data_create_item_sanitize_font_family() {
 		return array(
 			'multiword font with integer' => array(
 				'font_family_setting' => 'Libre Barcode 128 Text',
@@ -930,11 +930,11 @@ protected function check_font_face_data( $data, $post_id, $links ) {
 		$this->assertSame( $expected, $links['parent'][0]['href'], 'The links for a parent URL from the response data should match the parent\'s REST endpoint.' );
 	}
 
-	protected function check_file_meta( $font_face_id, $srcs ) {
+	protected function check_file_meta( $font_face_id, $src_attributes ) {
 		$file_meta = get_post_meta( $font_face_id, '_wp_font_face_file' );
 
-		foreach ( $srcs as $src ) {
-			$file_name = basename( $src );
+		foreach ( $src_attributes as $src_attribute ) {
+			$file_name = basename( $src_attribute );
 			$this->assertContains( $file_name, $file_meta, 'The uploaded font file path should be saved in the post meta.' );
 		}
 	}