FluentAssertions: equivalence of sorted lists

c# unit-testing nunit fluent-assertions
Samuel Neugber picture Samuel Neugber · Oct 10, 2014 · Viewed 16.1k times · Source

I'm trying to establish equivalence of two lists using FluentAssertions in C#, where two things are of importance:

  1. the elements are compared by the values they hold, not by reference (i.e. they are equivalent, not equal)
  2. the order of the elements in the lists is important

Is there no function in FluentAssertions (or even NUnit) that does this?

Cheers!

Answer

Dennis Doomen picture Dennis Doomen · Oct 10, 2014

By default, ShouldBeEquivalentTo() will ignore the order in the collections because in most cases two collections are equivalent if they contain the same items in any order. If you do care about the order, just use one of the overloads of WithStrictOrdering() on the options => parameter.

Example:

var myList = Enumerable.Range(1, 5);
var expected = new[]
{
    1, 2, 3, 4, 5
};

//succeeds
myList.ShouldBeEquivalentTo(expected, options => options.WithStrictOrdering());

//fails
myList.Reverse().ShouldBeEquivalentTo(expected, options => options.WithStrictOrdering());

Read more about these options in the documentation.

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