diff --git a/tests/phpunit/tests/functions/isSerializedString.php b/tests/phpunit/tests/functions/isSerializedString.php
index 677bf6d591..78f6860864 100644
--- a/tests/phpunit/tests/functions/isSerializedString.php
+++ b/tests/phpunit/tests/functions/isSerializedString.php
@@ -11,55 +11,7 @@
 class Tests_Functions_IsSerializedString extends WP_UnitTestCase {
 
 	/**
-	 * Data provider method for testing `is_serialized_string()`.
-	 *
-	 * @return array
-	 */
-	public function _is_serialized_string() {
-		return array(
-
-			// pass array.
-			array( array(), false ),
-
-			// pass a class.
-			array( new stdClass(), false ),
-
-			// Not a string.
-			array( 0, false ),
-
-			// Too short when trimmed.
-			array( 's:3       ', false ),
-
-			// Too short.
-			array( 's:3', false ),
-
-			// No colon in second position.
-			array( 's!3:"foo";', false ),
-
-			// No trailing semicolon.
-			array( 's:3:"foo"', false ),
-
-			// Wrong type.
-			array( 'a:3:"foo";', false ),
-
-			// No closing quote.
-			array( 'a:3:"foo;', false ),
-
-			// have to use double Quotes.
-			array( "s:12:'foo';", false ),
-
-			// Wrong number of characters is close enough for is_serialized_string().
-			array( 's:12:"foo";', true ),
-
-			// Okay.
-			array( 's:3:"foo";', true ),
-		);
-	}
-
-	/**
-	 * Run tests on `is_serialized_string()`.
-	 *
-	 * @dataProvider _is_serialized_string
+	 * @dataProvider data_is_serialized_string
 	 *
 	 * @param array|object|int|string $data     Data value to test.
 	 * @param bool                    $expected Expected function result.
@@ -67,4 +19,62 @@ class Tests_Functions_IsSerializedString extends WP_UnitTestCase {
 	public function test_is_serialized_string( $data, $expected ) {
 		$this->assertSame( $expected, is_serialized_string( $data ) );
 	}
+
+	/**
+	 * Data provider for `test_is_serialized_string()`.
+	 *
+	 * @return array
+	 */
+	public function data_is_serialized_string() {
+		return array(
+			'an array'                                => array(
+				'data'     => array(),
+				'expected' => false,
+			),
+			'a class'                                 => array(
+				'data'     => new stdClass(),
+				'expected' => false,
+			),
+			'an integer 0'                            => array(
+				'data'     => 0,
+				'expected' => false,
+			),
+			'a string that is too short when trimmed' => array(
+				'data'     => 's:3       ',
+				'expected' => false,
+			),
+			'a string that is too short'              => array(
+				'data'     => 's:3',
+				'expected' => false,
+			),
+			'not a colon in second position'          => array(
+				'data'     => 's!3:"foo";',
+				'expected' => false,
+			),
+			'no trailing semicolon'                   => array(
+				'data'     => 's:3:"foo"',
+				'expected' => false,
+			),
+			'wrong type of serialized data'           => array(
+				'data'     => 'a:3:"foo";',
+				'expected' => false,
+			),
+			'no closing quote'                        => array(
+				'data'     => 'a:3:"foo;',
+				'expected' => false,
+			),
+			'single quotes instead of double'         => array(
+				'data'     => "s:12:'foo';",
+				'expected' => false,
+			),
+			'wrong number of characters (should not matter)' => array(
+				'data'     => 's:12:"foo";',
+				'expected' => true,
+			),
+			'valid serialized string'                 => array(
+				'data'     => 's:3:"foo";',
+				'expected' => true,
+			),
+		);
+	}
 }