Fix assertInternalType deprecation in phpunit 9

Author: jderusse

Legacy/ForwardCompatTestTraitForV5.php

@@ -79,4 +79,114 @@ private function doTearDown()
     {
         parent::tearDown();
     }
+
+    /**
+     * @param string $message
+     *
+     * @return void
+     */
+    public static function assertIsArray($actual, $message = '')
+    {
+        static::assertInternalType('array', $actual, $message);
+    }
+
+    /**
+     * @param string $message
+     *
+     * @return void
+     */
+    public static function assertIsBool($actual, $message = '')
+    {
+        static::assertInternalType('bool', $actual, $message);
+    }
+
+    /**
+     * @param string $message
+     *
+     * @return void
+     */
+    public static function assertIsFloat($actual, $message = '')
+    {
+        static::assertInternalType('float', $actual, $message);
+    }
+
+    /**
+     * @param string $message
+     *
+     * @return void
+     */
+    public static function assertIsInt($actual, $message = '')
+    {
+        static::assertInternalType('int', $actual, $message);
+    }
+
+    /**
+     * @param string $message
+     *
+     * @return void
+     */
+    public static function assertIsNumeric($actual, $message = '')
+    {
+        static::assertInternalType('numeric', $actual, $message);
+    }
+
+    /**
+     * @param string $message
+     *
+     * @return void
+     */
+    public static function assertIsObject($actual, $message = '')
+    {
+        static::assertInternalType('object', $actual, $message);
+    }
+
+    /**
+     * @param string $message
+     *
+     * @return void
+     */
+    public static function assertIsResource($actual, $message = '')
+    {
+        static::assertInternalType('resource', $actual, $message);
+    }
+
+    /**
+     * @param string $message
+     *
+     * @return void
+     */
+    public static function assertIsString($actual, $message = '')
+    {
+        static::assertInternalType('string', $actual, $message);
+    }
+
+    /**
+     * @param string $message
+     *
+     * @return void
+     */
+    public static function assertIsScalar($actual, $message = '')
+    {
+        static::assertInternalType('scalar', $actual, $message);
+    }
+
+    /**
+     * @param string $message
+     *
+     * @return void
+     */
+    public static function assertIsCallable($actual, $message = '')
+    {
+        static::assertInternalType('callable', $actual, $message);
+    }
+
+    /**
+     * @param string $message
+     *
+     * @return void
+     */
+    public static function assertIsIterable($actual, $message = '')
+    {
+        static::assertInternalType('iterable', $actual, $message);
+    }
 }