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MVC3 unit testing
var searchResults = SearcherUnderTest.Search("TestKeyword");

Assert.IsInstanceOfType( Type expected, object searchResults );

[Test]
public void Search_ShouldReturnAListOfOrders()
{
    var result = _controller.Search("searchParameter") as MyViewModel ;

    Assert.That(result, Is.Not.Null);
    Assert.That(result.SearchResults, Is.Not.Null);
    Assert.That(result.SearchResults.Count, Is.GreaterThan(0));
}