Add method test suite

Author: sirreal

tests/phpunit/tests/fonts/font-library/wpFontUtils/normalizeCssFontFaceFontFamily.php

@@ -0,0 +1,39 @@
+<?php
+/**
+ * Test WP_Font_Utils::normalize_css_font_face_font_family().
+ *
+ * @package WordPress
+ * @subpackage Font Library
+ *
+ * @group fonts
+ * @group font-library
+ *
+ * @covers WP_Font_Utils::normalize_css_font_face_font_family
+ */
+class Tests_Fonts_WpFontUtils_normalizeCssFontFaceFontFamily extends WP_UnitTestCase {
+	/**
+	 * @ticket TBD
+	 *
+	 * @dataProvider data_provider
+	 */
+	public function test_normalize_css_font_face_font_family( string $input, ?string $expected ): void {
+		$result = WP_Font_Utils::normalize_css_font_face_font_family( $input );
+		$this->assertSame( $expected, $result );
+
+		// Idempotency check.
+		if ( null !== $result ) {
+			$this->assertSame( $result, WP_Font_Utils::normalize_css_font_face_font_family( $result ) );
+		}
+	}
+
+	/**
+	 * Data provider.
+	 */
+	public static function data_provider(): Generator {
+		yield 'Already normalized' => array( '"Font"', '"Font"' );
+		yield 'Unquoted' => array( 'Font', '"Font"' );
+		yield 'Multiple idents' => array( 'Font Name', '"Font Name"' );
+		yield 'Unitless number?' => array( 'Libre Barcode 128 Text', null );
+		yield 'Unitful number?' => array( '10px Size', null );
+	}
+}