Description
openedon Jan 18, 2018
Description
Is it possible to add an option to the DynamicDataAttribute allowing similar functionality to the DataRowAttribute.DisplayName. This would allow tests with similar parameters to be given more meaningful names and therefore make it easier to determine which set of parameter is producing a particular result.
A possible solution would be to set the a DisplayName property to the name of a method, just as dynamicDataSourceName is currently, and match the method signature of the default GetDisplayName method. This will allow a custom display name to be generated depending on the parameter set.
Current Behaviour
With the test class:
[TestClass]
public class Tests
{
[TestMethod]
[DynamicData(nameof(Tests.TestMethodTests))]
public void TestMethod(string param1, string param2)
{
Assert.IsNotNull(param1);
}
private static IEnumerable<object[]> TestMethodTests
{
get
{
yield return new object[] { "", null };
yield return new object[] { null, "" };
}
}
}
Displays output where it is not clear which set of parameters caused the failure
Failed TestMethod (,)
Error Message:
Assert.IsNotNull failed.
Stack Trace:
...
Possible Solution
// ....
[DynamicData(nameof(Tests.TestMethodTests), DisplayName = nameof(Tests.GetTestMethodDisplayName))]
// ...
public static string GetTestMethodDisplayName(MethodInfo methodInfo, object[] data)
{
// ....
}
// ....
Current Workaround
As a work around I have been adding an unused sting parameter to identify the test e.g:
// ....
public void TestMethod(string testName, string param1, string param2)
// ....
yield return new object[] { "Param2 null", "", null };
yield return new object[] { "Param1 null", null, "" };
// ....