         XCTAssertEqual(childViewFrame, frame)
     }
 
-    // MARK: - Fill
+}
+
+class KGNAutoLayoutTestsFill: KGNAutoLayoutTests {
 
     func testFillHorizontally1() {
         let priority = UILayoutPriorityDefaultLow

        XCTAssert(false)
    }

    // MARK: - Between

    func testFitBetweenTopItemAndBottomItem() {
        let width: CGFloat = 40

        XCTAssertEqual(childViewFrame, frame)
    }

}

class KGNAutoLayoutTestsSize: KGNAutoLayoutTests {

    func testSizeToWidth() {
        let size = CGSizeMake(50, 10)
