Repair the seems_utf8() tests that use Big5 encoding.

* Provide sample data that is actually encoded in Big5.
* Do some actual assertions against that data.

Props akumria.
Fixes #30455.

git-svn-id: https://develop.svn.wordpress.org/trunk@30525 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/data/formatting/big5.txt

@@ -1,51 +1,5 @@
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tests/phpunit/tests/formatting/SeemsUtf8.php

@@ -10,7 +10,7 @@ class Tests_Formatting_SeemsUtf8 extends WP_UnitTestCase {
 	 *
 	 * @dataProvider utf8_strings
 	 */
-    function test_returns_true_for_utf8_strings( $utf8_string ) {
+	function test_returns_true_for_utf8_strings( $utf8_string ) {
 		// from http://www.i18nguy.com/unicode-example.html
 		$this->assertTrue( seems_utf8( $utf8_string ) );
 	}
@@ -28,19 +28,17 @@ class Tests_Formatting_SeemsUtf8 extends WP_UnitTestCase {
 	 * @dataProvider big5_strings
 	 */
 	function test_returns_false_for_non_utf8_strings( $big5_string ) {
-		$this->markTestIncomplete( 'This test does not have any assertions.' );
-
-		$big5 = $big5[0];
-		$strings = array(
-			"abc",
-			"123",
-			$big5
-		);
+		$this->assertFalse( seems_utf8( $big5_string ) );
 	}
 
 	function big5_strings() {
 		// Get data from formatting/big5.txt
-		return array( array( 'incomplete' ) );
+		$big5_strings = file( DIR_TESTDATA . '/formatting/big5.txt' );
+		foreach ( $big5_strings as &$string ) {
+			$string = (array) trim( $string );
+		}
+		unset( $string );
+		return $big5_strings;
 	}
 }