Question

This is a really simple question I am sure, but I cannot figure out why this assertion fails…

basically if IsApple is false or IsBannana is false assertion should fail, however if one of the two is true assertion should pass, could anyone explain why this assertain fails?

        [Test]
        public void IsApplesOrBannans()
        {
            bool IsApple = true;
            bool IsBannana = false;

            if (!IsApple || !IsBannana)
                Assert.Fail();

            Assert.Pass();
        }

Answer 1

What you’re saying makes no sense.

Here’s how I (and the compiler) understand what you’re saying:

basically if IsApple is false or IsBannana is false assertion should fail

• If IsApple is false the assertion should fail
• If IsBanana is false, the assertion should fail

In other words, if one of them is false, you don’t care whether or not the other is also false.

however if one of the two is true assertion should pass

• If one of them is true, you don’t care whether the other one is also true.

Those requirements contradict each others.

Perhaps you meant “if IsApple is false AND IsBanana is false”; that is, if they are both false.

But what you wrote was “if IsApple is false OR IsBanana is false”, that is, if one of them are false.