public void MakeGuess_ShouldReturnNumber() { // Arrange int min = 0; int max = 10; int expected = 4; _randomGenerator.Setup( _ => _.Generate(min, max, It.IsAny <SortedSet <int> >())) .Returns(expected); // Act var result = _memoryGuess.MakeGuess(min, max); // Assert Assert.Equal(expected, result); }