Give object as parameter for test

Question

I trying to write a test that checks that a method isn't overwritten incorrectly in derived classes. So I tried the following. But no matter what I try it doesn't seem to allow me to "inject" my object.

[Theory]
[xxxData(new BaseClass())]
[xxxData(new DerivedClass())]
public void Test_Stuff(BaseClass obj)
{
    // ...
}

A complete guide that sends complex objects as a parameter to Test methods [complex types in Unit test](https://stackoverflow.com/a/56413307/7487135) — Iman Bahrampour, Jun 02 '19 at 08:48

score 14 · Accepted Answer · edited May 23 '17 at 12:24

Assuming I understand your goal, I see two ways:

Using InlineDataAttribute and passing Types

Using MemberDataAttribute (PropertyData in xunit.net v1)

[Theory]
[InlineData(typeof(BaseClass))]
[InlineData(typeof(DerivedClass))]
public void Test_Stuff(Type type/*BaseClass obj*/)
{
    var obj = Activator.CreateInstance(type) as BaseClass;
    CheckConstrain(obj);
}


[Theory]
[MemberData("GetObjects")]
public void Test_Stuff2(BaseClass obj)
{
    CheckConstrain(obj);
}

public static IEnumerable<object[]> GetObjects
{
    get
    {
       return new[] 
       {
        new object[] { new BaseClass() },
        new object[] { new DerivedClass() }
       };
    }
}

private static void CheckConstrain(BaseClass baseClass)
{
    Assert.True(baseClass.Foo() <= 1);
}

See also this related answer Pass complex parameters to [Theory]

Give object as parameter for test

1 Answers1