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| 27 | <script language="JavaScript" src="codeFuncs.js" ></script> <!-- Do it this way for IE -->
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| 28 |
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| 29 | <h3>ValueSourceAttribute (NUnit 2.5)</h3>
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| 30 |
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| 31 | <p><b>ValueSourceAttribute</b> is used on individual parameters of a test method to
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| 32 | identify a named source for the argument values to be supplied. The attribute has
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| 33 | two public constructors.
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| 34 |
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| 35 | <div class="code">
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| 36 | <pre>
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| 37 | ValueSourceAttribute(Type sourceType, string sourceName);
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| 38 | ValueSourceAttribute(string sourceName);
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| 39 | </pre>
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| 40 | </div>
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| 41 |
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| 42 | <p>If <b>sourceType</b> is specified, it represents the class that provides
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| 43 | the data. It must have a default constructor.
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| 44 |
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| 45 | <p>If <b>sourceType</b> is not specified, the class containing the test
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| 46 | method is used. NUnit will construct it using either the default constructor
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| 47 | or - if arguments are provided - the appropriate constructor for those
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| 48 | arguments.
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| 49 |
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| 50 | <p>The <b>sourceName</b>, represents the name of the source that will
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| 51 | provide the arguments. It should have the following characteristics:
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| 52 | <ul>
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| 53 | <li>It may be a field, a non-indexed property or a method taking no arguments.
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| 54 | <li>It may be either an instance or a static member.
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| 55 | <li>It must return an IEnumerable or a type that implements IEnumerable.
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| 56 | <li>The individual items returned from the enumerator must be compatible
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| 57 | with the type of the parameter on which the attribute appears.
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| 58 | </ul>
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| 59 |
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| 60 | <h3>Order of Execution</h3>
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| 61 |
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| 62 | <p>In NUnit 2.5, individual test cases are sorted alphabetically and executed in
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| 63 | that order. With NUnit 2.5.1, the individual cases are not sorted, but are
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| 64 | executed in the order in which NUnit discovers them. This order does <b>not</b>
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| 65 | follow the lexical order of the attributes and will often vary between different
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| 66 | compilers or different versions of the CLR.
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| 67 |
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| 68 | <p>As a result, when <b>ValueSourceAttribute</b> appears multiple times on a
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| 69 | parameter or when other data-providing attributes are used in combination with
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| 70 | <b>ValueSourceAttribute</b>, the order of the arguments is undefined.
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| 71 |
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| 72 | <p>However, when a single <b>ValueSourceAttribute</b> is used by itself,
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| 73 | the order of the arguments follows exactly the order in which the data
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| 74 | is returned from the source.
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| 75 |
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| 76 | <h3>Note on Object Construction</h3>
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| 77 |
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| 78 | <p>NUnit locates the test cases at the time the tests are loaded, creates
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| 79 | instances of each class with non-static sources and builds a list of
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| 80 | tests to be executed. Each source object is only created once at this
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| 81 | time and is destroyed after all tests are loaded.
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| 82 |
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| 83 | <p>If the data source is in the test fixture itself, the object is created
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| 84 | using the appropriate constructor for the fixture parameters provided on
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| 85 | the <b>TestFixtureAttribute</b>, or
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| 86 | the default constructor if no parameters were specified. Since this object
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| 87 | is destroyed before the tests are run, no communication is possible between
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| 88 | these two phases - or between different runs - except through the parameters
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| 89 | themselves.
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