158 lines
6.0 KiB
HTML
158 lines
6.0 KiB
HTML
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<title>NUnit - ValueSource</title>
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<script language="JavaScript" src="codeFuncs.js" ></script> <!-- Do it this way for IE -->
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<h3>ValueSourceAttribute (NUnit 2.5)</h3>
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<p><b>ValueSourceAttribute</b> is used on individual parameters of a test method to
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identify a named source for the argument values to be supplied. The attribute has
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two public constructors.
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<div class="code">
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<pre>
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ValueSourceAttribute(Type sourceType, string sourceName);
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ValueSourceAttribute(string sourceName);
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</pre>
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</div>
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<p>If <b>sourceType</b> is specified, it represents the class that provides
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the data. It must have a default constructor.
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<p>If <b>sourceType</b> is not specified, the class containing the test
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method is used. NUnit will construct it using either the default constructor
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or - if arguments are provided - the appropriate constructor for those
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arguments.
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<p>The <b>sourceName</b>, represents the name of the source that will
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provide the arguments. It should have the following characteristics:
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<ul>
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<li>It may be a field, a non-indexed property or a method taking no arguments.
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<li>It may be either an instance or a static member.
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<li>It must return an IEnumerable or a type that implements IEnumerable.
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<li>The individual items returned from the enumerator must be compatible
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with the type of the parameter on which the attribute appears.
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</ul>
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<h3>Order of Execution</h3>
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<p>In NUnit 2.5, individual test cases are sorted alphabetically and executed in
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that order. With NUnit 2.5.1, the individual cases are not sorted, but are
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executed in the order in which NUnit discovers them. This order does <b>not</b>
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follow the lexical order of the attributes and will often vary between different
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compilers or different versions of the CLR.
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<p>As a result, when <b>ValueSourceAttribute</b> appears multiple times on a
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parameter or when other data-providing attributes are used in combination with
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<b>ValueSourceAttribute</b>, the order of the arguments is undefined.
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<p>However, when a single <b>ValueSourceAttribute</b> is used by itself,
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the order of the arguments follows exactly the order in which the data
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is returned from the source.
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<h3>Note on Object Construction</h3>
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<p>NUnit locates the test cases at the time the tests are loaded, creates
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instances of each class with non-static sources and builds a list of
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tests to be executed. Each source object is only created once at this
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time and is destroyed after all tests are loaded.
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<p>If the data source is in the test fixture itself, the object is created
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using the appropriate constructor for the fixture parameters provided on
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the <b>TestFixtureAttribute</b>, or
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the default constructor if no parameters were specified. Since this object
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is destroyed before the tests are run, no communication is possible between
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these two phases - or between different runs - except through the parameters
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themselves.
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