CODEWITHSUNDEEP
c#unit-testingnunit
Graviton
Graviton

Reputation: 83244

CollectionAssert.AreEquivalent with Custom IEqualityComparer

I have two lists, I want to check whether the two lists are the same ( order not important), and whether it's the same depends on the IEqualityComparer instance I implement.

The ideal case is that I can use CollectionAssert.AreEquivalent with Custom IEqualityComparer. However it seems that CollectionAssert.AreEquivalent doesn't take in any IEqualityComparer.

Any idea on how to do this in a succinct and reusable manner?

Upvotes: 32

Views: 5060

Answers (1)

Quartermeister
Quartermeister

Reputation: 59129

CollectionAssert.AreEquivalent is implemented as: 

Assert.That(actual, new CollectionEquivalentConstraint(expected), message, args);

You can write out your assert that way and supply a custom IEqualityComparer with Using: 

Assert.That(actual,
    new CollectionEquivalentConstraint(expected).Using(customComparer));

You can also shorten new CollectionEquivalentConstraint to Is.EquivalentTo: 

Assert.That(actual, Is.EquivalentTo(expected).Using(customComparer));

Upvotes: 40

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