C# unit test, how to test greater than

Question

In C# how can I unit test a greater than condition?

I.e., iIf record count is greater than 5 the test succeed.

Any help is appreciated

Code:

int actualcount = target.GetCompanyEmployees().Count
Assert. ?

Solution 1

Assert.IsTrue(actualCount > 5, "The actualCount was not greater than five");

Solution 2

It depends on which testing framework you're using.

For xUnit.net:

Assert.True(actualCount > 5, "Expected actualCount to be greater than 5.");

For NUnit:

Assert.Greater(actualCount, 5);; however, the new syntax

Assert.That(actualCount, Is.GreaterThan(5)); is encouraged.

For MSTest:

Assert.IsTrue(actualCount > 5, "Expected actualCount to be greater than 5.");

Solution 3

The right way to do this when using nUnit is:

Assert.That(actualcount , Is.GreaterThan(5));

Solution 4

xUnit: if you know upper bound (=100 in example), you can use:

Assert.InRange(actualCount, 5, 100);

Solution 5

A generic solution that can be used with any comparable type:

public static T ShouldBeGreaterThan<T>(this T actual, T expected, string message = null)
    where T: IComparable
{
    Assert.IsTrue(actual.CompareTo(expected) > 0, message);
    return actual;
}

View more solutions

Comments

[McKay]

But it's best to put a message so that you know why the test failed: Assert.IsTrue(actualCount > 5, "The actualCount was not greater than five");

[Jon Skeet]

@McKay: I personally find that a wasted effort. If the test fails, I'm going to look at its code anyway, so it wouldn't save much time even when it fails and the majority of assertions are never going to fail after the first check-in IME.

[McKay]

Well, frequently, I write tests in a manner that the test code will be run for a bunch of different tests. So while I will look at the code, I don't always look at the code that does the assertions, because they're not always close together.

[Wix]

@Sri: Mark as answer, please.

[Ray Cheng]

'Microsoft.VisualStudio.TestTools.UnitTesting.Assert' does not contain a definition for 'That'. in VS 2012.

[ShloEmi]

Looks good, this is Extension Method of ? what namespace to define?

[RoLYroLLs]

This is only good for FluentAssertions, but as @ShloEmi told NKnusperer, good tip for those using it.

[Timothy]

If you're more inclined to use the classic assert style for NUnit, another option is Assert.Greater(actualcount, 5);