Add test for invalid responseType option

Author: jncarver

tests/FiltererTest.php

@@ -303,6 +303,18 @@ public function defaultRequiredNotBool()
         Filterer::filter([], [], ['defaultRequired' => 1]);
     }
 
+    /**
+     * @test
+     * @covers ::filter
+     */
+    public function filterThrowsExceptionOnInvalidResponseType()
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage("'responseType' was not a recognized value");
+
+        Filterer::filter([], [], ['responseType' => 'invalid']);
+    }
+
     /**
      * @test
      * @covers ::filter