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And Constraint

docs/articles/nunit/writing-tests/constraints/AndConstraint.md

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And Constraint

AndConstraint combines two other constraints and succeeds only if they both succeed.

Constructor

csharp
AndConstraint(Constraint left, Constraint right)

Syntax

csharp
<Constraint>.And.<Constraint>

Examples of Use

[!code-csharpAndConstraintExamples]

Evaluation Order and Precedence

Note that the constraint evaluates the sub-constraints left to right, meaning that Assert.That(i, Is.Not.Null.And.GreaterThan(9)); where i is a nullable int will work for 10, but fail for null with the message Expected: not null and greater than 9. But was: null. Assert.That(i, Is.GreaterThan(9).And.Not.Null); will also succeed for 10, but throw an exception for null, as null cannot be compared to 9.

The OrConstraint has precedence over the AndConstraint.

See also