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CollectionSubset Constraint

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

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CollectionSubset Constraint

CollectionSubsetConstraint tests that one IEnumerable is a subset of another. If the actual value passed does not implement IEnumerable, an exception is thrown.

Constructor

csharp
CollectionSubsetConstraint(IEnumerable)

Syntax

csharp
Is.SubsetOf(IEnumerable)

Modifiers

csharp
...Using(IEqualityComparer comparer)
...Using(IComparer comparer)
...Using<T>(IEqualityComparer<T> comparer)
...Using<T>(IComparer<T> comparer)
...Using<T>(Comparison<T> comparer)
...Using<T>(Func<T, T, bool> comparer)
...Using<TSubsetElement, TSupersetElement>(Func<TSubsetElement, TSupersetElement, bool> comparison)
...UsingPropertiesComparer()  // From version 4.1
...UsingPropertiesComparer(
      Func<PropertiesComparerConfiguration,
           PropertiesComparerConfiguration> configure) // From version 4.4

Example of Use

csharp
int[] iarray = new int[] { 1, 3 };
Assert.That(iarray, Is.SubsetOf(new int[] { 1, 2, 3 }));