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