 		let dict = ["test":NSNull()]
 		XCTAssertFalse(VALID(dict, "test"))
 	}
-
-	// MARK: VALID_AND_IS_CLASS
+}
+
+// MARK: VALID_AND_IS_CLASS
+
+extension DKHelperTests {
 
 	func test_ShouldVerifyValidClassValue() {
 		let dict = ["test":"string"]

		let dict = ["test":4]
		XCTAssert(VALID_AND_IS_CLASS(dict, "test", nil))
	}

	// MARK: OBJECT

	func test_ShouldReturnValidValue() {
		let dict = ["test":4]

		let dict = ["test":NSNull()]
		XCTAssert(OBJECT(dict, "test") == nil)
	}
}

// MARK: OBJECT_FOR_KEYS

extension DKHelperTests {

	func test_ShouldReturnSecondValidValue() {
		let dict = ["first":["second":4]]
