334 lines
8.8 KiB
HTML
334 lines
8.8 KiB
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<title>NUnit - CollectionConstraints</title>
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<a href="http://www.nunit.org">NUnit</a>
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<div id="content">
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<h2>Collection Constraints (NUnit 2.4 / 2.5)</h2>
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<p>Collection constraints perform tests that are specific to collections.
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The following collection constraints are provided. Before NUnit 2.4.6,
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these constraints only operated on true Collections. Beginning with 2.4.6,
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they can work with any object that implements IEnumerable.
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<p>Beginning with NUnit 2.4.2, use of an improper argument type caused tests
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to fail. Later releases give an error rather than a failure, so that negated
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constraints will not appear to succeed.
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<p>For example, both of the following statements give an error in later releases,
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but the second would have succeeded in earlier versions of NUnit.
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<div class="code"><pre>
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int[] iarray = new int[] { 1, 2, 3 };
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Assert.That( 5, Is.SubsetOf( iarray ) ); // Fails in early releases
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Assert.That( 5, Is.Not.SubsetOf( iarray ) ); /
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</pre></div>
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<h3>AllItemsConstraint</h3>
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<h4>Action</h4>
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<p>Applies a constraint to each item in a collection, succeeding only if all of them succeed.
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<h4>Constructor</h4>
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<div class="code"><pre>
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AllItemsConstraint(Constraint itemConstraint)
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</pre></div>
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<h4>Syntax</h4>
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<div class="code"><pre>
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Is.All...
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Has.All...
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</pre></div>
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<h4>Examples of Use</h4>
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<div class="code"><pre>
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int[] iarray = new int[] { 1, 2, 3 };
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string[] sarray = new string[] { "a", "b", "c" };
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Assert.That( iarray, Is.All.Not.Null );
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Assert.That( sarray, Is.All.InstanceOf<string>() );
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Assert.That( iarray, Is.All.GreaterThan(0) );
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Assert.That( iarray, Has.All.GreaterThan(0) );
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</pre></div>
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<h3>SomeItemsConstraint</h3>
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<h4>Action</h4>
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<p>Applies a constraint to each item in a collection, succeeding if at least one of them succeeds.
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<h4>Constructor</h4>
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<div class="code"><pre>
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SomeItemsConstraint(Constraint itemConstraint)
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</pre></div>
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<h4>Syntax</h4>
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<div class="code"><pre>
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Has.Some...
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</pre></div>
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<h4>Examples of Use</h4>
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<div class="code"><pre>
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int[] iarray = new int[] { 1, 2, 3 };
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string[] sarray = new string[] { "a", "b", "c" };
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Assert.That( iarray, Has.Some.GreaterThan(2) );
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Assert.That( sarray, Has.Some.Length(1) );
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</pre></div>
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<h3>NoItemConstraint</h3>
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<h4>Action</h4>
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<p>Applies a constraint to each item in a collection, succeeding only if all of them fail.
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<h4>Constructor</h4>
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<div class="code"><pre>
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NoItemConstraint(Constraint itemConstraint)
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</pre></div>
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<h4>Syntax</h4>
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<div class="code"><pre>
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Has.None...
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Has.No...
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</pre></div>
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<h4>Examples of Use</h4>
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<div class="code"><pre>
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int[] iarray = new int[] { 1, 2, 3 };
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string[] sarray = new string[] { "a", "b", "c" };
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Assert.That( iarray, Has.None.Null );
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Assert.That( iarray, Has.No.Null );
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Assert.That( sarray, Has.None.EqualTo("d") );
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Assert.That( iarray, Has.None.LessThan(0) );
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</pre></div>
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<h3>UniqueItemsConstraint</h3>
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<h4>Action</h4>
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<p>Tests that a collection contains only unique items.
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<h4>Constructor</h4>
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<div class="code"><pre>
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UniqueItemsConstraint()
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</pre></div>
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<h4>Syntax</h4>
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<div class="code"><pre>
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Is.Unique
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</pre></div>
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<h4>Example of Use</h4>
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<div class="code"><pre>
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string[] sarray = new string[] { "a", "b", "c" };
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Assert.That( sarray, Is.Unique );
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</pre></div>
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<h4>Notes</h4>
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<ol>
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<li>??
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</ol>
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<h3>CollectionContainsConstraint</h3>
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<h4>Action</h4>
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<p>Tests that a collection contains an object.
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<h4>Constructor</h4>
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<div class="code"><pre>
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CollectionContainsConstraint( object )
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</pre></div>
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<h4>Syntax</h4>
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<div class="code"><pre>
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Has.Member( object )
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Contains.Item( object )
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</pre></div>
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<h4>Modifiers</h4>
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<div class="code"><pre>
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...Using(IComparer comparer)
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...Using<T>(IComparer<T> comparer)
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...Using<T>(Comparison<T> comparer)
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</pre></div>
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<h4>Examples of Use</h4>
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<div class="code"><pre>
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int[] iarray = new int[] { 1, 2, 3 };
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string[] sarray = new string[] { "a", "b", "c" };
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Assert.That( iarray, Has.Member(3) );
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Assert.That( sarray, Has.Member("b") );
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Assert.That( sarray, Contains.Item("c") );
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Assert.That( sarray, Has.No.Member("x") );
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</pre></div>
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<h4>Notes</h4>
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<ol>
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<li>For references, <b>Has.Member</b> uses object equality to find a member in a
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collection. To check for an object equal to an item the collection, use
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<b>Has.Some.EqualTo(...)</b>.
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</ol>
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<h3>CollectionEquivalentConstraint</h3>
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<h4>Action</h4>
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<p>Tests that two collections are equivalent - that they contain
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the same items, in any order.
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<h4>Constructor</h4>
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<div class="code"><pre>
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CollectionEquivalentConstraint( IEnumerable other )
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</pre></div>
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<h4>Syntax</h4>
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<div class="code"><pre>
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Is.EquivalentTo( IEnumerable other )
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</pre></div>
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<h4>Examples of Use</h4>
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<div class="code"><pre>
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int[] iarray = new int[] { 1, 2, 3 };
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string[] sarray = new string[] { "a", "b", "c" };
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Assert.That( new string[] { "c", "a", "b" }, Is.EquivalentTo( sarray ) );
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Assert.That( new int[] { 1, 2, 2 }, Is.Not.EquivalentTo( iarray ) );
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</pre></div>
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<h4>Notes</h4>
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<ol>
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<li>To compare collections for equality, use Is.EqualTo().
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</ol>
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<h3>CollectionSubsetConstraint</h3>
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<h4>Action</h4>
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<p>Tests that one collection is a subset of another.
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<h4>Constructor</h4>
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<div class="code"><pre>
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CollectionSubsetConstraint( ICollection )
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</pre></div>
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<h4>Syntax</h4>
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<div class="code"><pre>
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Is.SubsetOf( IEnumerable )
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</pre></div>
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<h4>Example of Use</h4>
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<div class="code"><pre>
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int[] iarray = new int[] { 1, 2, 3 };
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Assert.That( new int[] { 1, 3 }, Is.SubsetOf( iarray ) );
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</pre></div>
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<h3>CollectionOrderedConstraint (NUnit 2.5)</h3>
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<h4>Action</h4>
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<p>Tests that a collection is ordered.
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<h4>Constructor</h4>
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<div class="code"><pre>
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CollectionOrderedConstraint()
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</pre></div>
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<h4>Syntax</h4>
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<div class="code"><pre>
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Is.Ordered
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</pre></div>
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<h4>Modifiers</h4>
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<div class="code"><pre>
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...Descending
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...By(string propertyName)
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...Using(IComparer comparer)
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...Using<T>(IComparer<T> comparer)
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...Using<T>(Comparison<T> comparer)
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</pre></div>
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<h4>Examples of Use</h4>
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<div class="code"><pre>
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int[] iarray = new int[] { 1, 2, 3 };
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string[] sarray = new string[] { "c", "b", "a" };
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string[] sarray2 = new string[] ( "a", "aa", "aaa" );
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Assert.That( iarray, Is.Ordered );
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Assert.That( sarray, Is.Ordered.Descending );
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Assert.That( sarray2, Is.Ordered.By("Length");
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</pre></div>
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<h4>Notes</h4>
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<ol>
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<li>Modifiers may be combined and may appear in any order. If the
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same modifier is used more than once, the result is undefined.
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<li>The syntax of Is.Ordered has changed from earlier betas.
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</ol>
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</div>
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<li><a href="attributes.html">Attributes</a></li>
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