public void Test_CheckForCollisionIsTrue(int Alt1, int Alt2, int Dist, bool Collision) { AircraftData a1 = new AircraftData("", 0, 0, Alt1, null); AircraftData a2 = new AircraftData("", 0, 0, Alt2, null); _utility.CalcDistance(a1, a2).Returns(Dist); Assert.That(_uut.CheckForCollision(a1, a2) == Collision); }