214 lines
5.3 KiB
HTML
214 lines
5.3 KiB
HTML
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<title>NUnit - ConditionConstraints</title>
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<h2>Condition Constraints (NUnit 2.4)</h2>
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<p>ConditionConstraints test a specific condition and are named for the condition
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they test. They verify that the actual value satisfies the condition. The
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following condition helpers are provided.
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<h3>NullConstraint</h3>
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<h4>Action</h4>
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<p>Tests that a value is Null.
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<h4>Constructor</h4>
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<div class="code"><pre>
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NullConstraint()
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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.Null
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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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Assert.That( anObject, Is.Null );
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Assert.That( anObject, Is.Not.Null );
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</pre></div>
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<h3>TrueConstraint</h3>
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<h4>Action</h4>
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<p>Tests that a value is true.
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<h4>Constructor</h4>
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<div class="code"><pre>
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TrueConstraint()
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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.True
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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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Assert.That( condition, Is.True );
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</pre></div>
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<h3>FalseConstraint</h3>
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<h4>Action</h4>
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<p>Tests that a value is false.
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<h4>Constructor</h4>
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<div class="code"><pre>
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FalseConstraint()
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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.False
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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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Assert.That( condition, Is.False );
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</pre></div>
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<h3>NaNConstraint</h3>
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<h4>Action</h4>
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<p>Tests that a value is floating-point NaN.
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<h4>Constructor</h4>
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<div class="code"><pre>
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NaNConstraint()
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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.NaN
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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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Assert.That( aDouble, Is.NaN );
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Assert.That( aDouble, Is.Not.NaN );
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</pre></div>
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<h3>EmptyConstraint</h3>
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<h4>Action</h4>
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<p>Tests that an object is an empty string, directory or collection.
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<h4>Constructor</h4>
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<div class="code"><pre>
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EmptyConstraint()
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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.Empty
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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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Assert.That( aString, Is.Empty );
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Assert.Thst( dirInfo, Is.Empty );
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Assert.That( collection, Is.Empty );
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</pre></div>
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<h4>Notes</h4>
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<ol>
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<li><b>EmptyConstraint</b> creates and uses either an <b>EmptyStringConstraint</b>,
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<b>EmptyDirectoryConstraint</b> or <b>EmptyCollectionConstraint</b> depending on
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the argument tested.
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<li>A <b>DirectoryInfo</b> argument is required in order to test for an empty directory.
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To test whether a string represents a directory path, you must first construct
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a <b>DirectoryInfo</b>.
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</ol>
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<h3>UniqueItemsConstraint</h3>
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<h4>Action</h4>
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<p>Tests that an array, collection or other IEnumerable is composed
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of unique items with no duplicates.
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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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Assert.That( collection, Is.Unique );
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</pre></div>
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</div>
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<ul>
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<li><a href="index.html">NUnit 2.5.9</a></li>
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<ul>
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<li><a href="getStarted.html">Getting Started</a></li>
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<li><a href="assertions.html">Assertions</a></li>
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<li id="current"><a href="conditionConstraints.html">Condition Constraints</a></li>
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<li><a href="delayedConstraint.html">Delayed Constraint</a></li>
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