CODEWITHSUNDEEP
c#xunitfluent-assertions
user2958542
user2958542

Reputation: 341

FluentAssertions, making sure IEnumerable contains only single element

I am writing unit tests and I have something that looks like this:

[Fact]
public void GetFoos_only_gets_foo1()
{
    _foo1.included = true; //Foo object
    _foo2.included = false; //Foo object
    _sut.GetFoos().Should().OnlyContain(_foo1); // this doesn't work, is there a specific syntax to use?
}

And GetFoos() returns and IEnumerable<Foo>

Upvotes: 6

Views: 8615

Answers (3)

Sophia
Sophia

Reputation: 61

With 6.7.0 version of FluentAssertions you can use :

_sut.GetFoos()
    .Should().ContainSingle()
    .Which.Should().Be(_foo1);

Upvotes: 6

George Simms
George Simms

Reputation: 4060

OnlyContain expects a predicate - 

 GetFoos().Should().OnlyContain(x => _foo1.Equals(x));

Upvotes: 7

Eric Bowser
Eric Bowser

Reputation: 62

Try this page as see if it helps. https://github.com/dennisdoomen/fluentassertions/wiki

collection.Should().ContainSingle();
collection.Should().ContainSingle(x => x > 3);
collection.Should().Contain(8).And.HaveElementAt(2, 5).And.NotBeSubsetOf(new[] {11, 56});
collection.Should().Contain(x => x > 3); 
collection.Should().Contain(collection, 5, 6); // It should contain the original items, plus 5 and 6.

Upvotes: -2

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