diff --git a/src/wp-includes/fonts/class-wp-font-library.php b/src/wp-includes/fonts/class-wp-font-library.php
index 3e48a1d797b6b..c863ca1c7ca5c 100644
--- a/src/wp-includes/fonts/class-wp-font-library.php
+++ b/src/wp-includes/fonts/class-wp-font-library.php
@@ -23,19 +23,17 @@ class WP_Font_Library {
 	 *
 	 * @since 6.5.0
 	 *
-	 * @param array $php_version_id The version of PHP to provide mime types for. The default is the current PHP version.
-	 *
 	 * @return Array A collection of mime types keyed by file extension.
 	 */
-	public static function get_expected_font_mime_types_per_php_version( $php_version_id = PHP_VERSION_ID ) {
+	private static function get_expected_font_mime_types_for_php_version() {
 
-		$php_7_ttf_mime_type = $php_version_id >= 70300 ? 'application/font-sfnt' : 'application/x-font-ttf';
+		$php_7_ttf_mime_type = PHP_VERSION_ID >= 70300 ? 'application/font-sfnt' : 'application/x-font-ttf';
 
 		return array(
 			'otf'   => 'application/vnd.ms-opentype',
-			'ttf'   => $php_version_id >= 70400 ? 'font/sfnt' : $php_7_ttf_mime_type,
-			'woff'  => $php_version_id >= 80100 ? 'font/woff' : 'application/font-woff',
-			'woff2' => $php_version_id >= 80100 ? 'font/woff2' : 'application/font-woff2',
+			'ttf'   => PHP_VERSION_ID >= 70400 ? 'font/sfnt' : $php_7_ttf_mime_type,
+			'woff'  => PHP_VERSION_ID >= 80100 ? 'font/woff' : 'application/font-woff',
+			'woff2' => PHP_VERSION_ID >= 80100 ? 'font/woff2' : 'application/font-woff2',
 		);
 	}
 
@@ -150,6 +148,6 @@ public static function get_font_collection( $slug ) {
 	 * @return array Modified upload directory.
 	 */
 	public static function set_allowed_mime_types( $mime_types ) {
-		return array_merge( $mime_types, self::get_expected_font_mime_types_per_php_version() );
+		return array_merge( $mime_types, self::get_expected_font_mime_types_for_php_version() );
 	}
 }
diff --git a/tests/phpunit/tests/fonts/font-library/wpFontLibrary/getMimeTypes.php b/tests/phpunit/tests/fonts/font-library/wpFontLibrary/getMimeTypes.php
deleted file mode 100644
index 4fb97e754611f..0000000000000
--- a/tests/phpunit/tests/fonts/font-library/wpFontLibrary/getMimeTypes.php
+++ /dev/null
@@ -1,89 +0,0 @@
-<?php
-/**
- * Test WP_Font_Library::get_expected_font_mime_types_per_php_version().
- *
- * @package WordPress
- * @subpackage Font Library
- *
- * @group fonts
- * @group font-library
- *
- * @covers WP_Font_Library::get_expected_font_mime_types_per_php_version
- */
-class Tests_Fonts_WpFontLibrary_GetMimeTypes extends WP_Font_Library_UnitTestCase {
-
-	/**
-	 * @dataProvider data_should_supply_correct_mime_type_for_php_version
-	 *
-	 * @param int   $php_version_id PHP_VERSION_ID value.
-	 * @param array $expected       Expected mime types.
-	 */
-	public function test_should_supply_correct_mime_type_for_php_version( $php_version_id, $expected ) {
-		$mimes = WP_Font_Library::get_expected_font_mime_types_per_php_version( $php_version_id );
-		$this->assertSame( $expected, $mimes );
-	}
-
-	/**
-	 * Data provider.
-	 *
-	 * @return array
-	 */
-	public function data_should_supply_correct_mime_type_for_php_version() {
-		return array(
-			'version 7.2' => array(
-				'php_version_id' => 70200,
-				'expected'       => array(
-					'otf'   => 'application/vnd.ms-opentype',
-					'ttf'   => 'application/x-font-ttf',
-					'woff'  => 'application/font-woff',
-					'woff2' => 'application/font-woff2',
-				),
-			),
-			'version 7.3' => array(
-				'php_version_id' => 70300,
-				'expected'       => array(
-					'otf'   => 'application/vnd.ms-opentype',
-					'ttf'   => 'application/font-sfnt',
-					'woff'  => 'application/font-woff',
-					'woff2' => 'application/font-woff2',
-				),
-			),
-			'version 7.4' => array(
-				'php_version_id' => 70400,
-				'expected'       => array(
-					'otf'   => 'application/vnd.ms-opentype',
-					'ttf'   => 'font/sfnt',
-					'woff'  => 'application/font-woff',
-					'woff2' => 'application/font-woff2',
-				),
-			),
-			'version 8.0' => array(
-				'php_version_id' => 80000,
-				'expected'       => array(
-					'otf'   => 'application/vnd.ms-opentype',
-					'ttf'   => 'font/sfnt',
-					'woff'  => 'application/font-woff',
-					'woff2' => 'application/font-woff2',
-				),
-			),
-			'version 8.1' => array(
-				'php_version_id' => 80100,
-				'expected'       => array(
-					'otf'   => 'application/vnd.ms-opentype',
-					'ttf'   => 'font/sfnt',
-					'woff'  => 'font/woff',
-					'woff2' => 'font/woff2',
-				),
-			),
-			'version 8.2' => array(
-				'php_version_id' => 80200,
-				'expected'       => array(
-					'otf'   => 'application/vnd.ms-opentype',
-					'ttf'   => 'font/sfnt',
-					'woff'  => 'font/woff',
-					'woff2' => 'font/woff2',
-				),
-			),
-		);
-	}
-}
diff --git a/tests/phpunit/tests/fonts/font-library/wpFontLibrary/setAllowedMimeTypes.php b/tests/phpunit/tests/fonts/font-library/wpFontLibrary/setAllowedMimeTypes.php
new file mode 100644
index 0000000000000..a4542b06a2453
--- /dev/null
+++ b/tests/phpunit/tests/fonts/font-library/wpFontLibrary/setAllowedMimeTypes.php
@@ -0,0 +1,52 @@
+<?php
+/**
+ * Test WP_Font_Library::set_allowed_mime_types().
+ *
+ * @package WordPress
+ * @subpackage Font Library
+ *
+ * @group fonts
+ * @group font-library
+ * @group toto
+ *
+ * @covers WP_Font_Library::set_allowed_mime_types
+ */
+class Tests_Fonts_WpFontLibrary_SetAllowedMimeTypes extends WP_Font_Library_UnitTestCase {
+
+	public function test_should_supply_correct_mime_type_for_php_version() {
+		$allowed_mime_types_per_php_version = array(
+			0 => array(
+				'otf'   => 'application/vnd.ms-opentype',
+				'ttf'   => 'application/x-font-ttf',
+				'woff'  => 'application/font-woff',
+				'woff2' => 'application/font-woff2',
+			),
+			70300 => array(
+				'otf'   => 'application/vnd.ms-opentype',
+				'ttf'   => 'application/font-sfnt',
+				'woff'  => 'application/font-woff',
+				'woff2' => 'application/font-woff2',
+			),
+			70400 => array(
+				'otf'   => 'application/vnd.ms-opentype',
+				'ttf'   => 'font/sfnt',
+				'woff'  => 'application/font-woff',
+				'woff2' => 'application/font-woff2',
+			),
+			80100 => array(
+				'otf'   => 'application/vnd.ms-opentype',
+				'ttf'   => 'font/sfnt',
+				'woff'  => 'font/woff',
+				'woff2' => 'font/woff2',
+			),
+		);
+		foreach ( $allowed_mime_types_per_php_version as $php_version => $current_mime_types ) {
+			if ( $php_version < PHP_VERSION_ID ) {
+				$expected = $current_mime_types;
+			}
+		}
+
+		$mimes = WP_Font_Library::set_allowed_mime_types( array() );
+		$this->assertSame( $expected, $mimes );
+	}
+}