c# - Unit Testing - Is it bad form to have unit test calling other unit tests

Question

I have a unit test called TestMakeAValidCall(). It tests my phone app making a valid call.

I am about to write another test called TestShowCallMessage() that needs to have a valid call made for the test. Is it bad form to just call TestMakeAValidCall() in that test?

For reference this is my TestMakeAValidCall() test.

    [TestMethod]
    public void TestMakeAValidCall()
    {
       //Arrange
        phone.InCall = false;
        phone.CurrentNumber = "";
        // Stub the call to the database
        data.Expect(x => x.GetWhiteListData()).
            Return(FillTestObjects.GetSingleEntryWhiteList());
        // Get some bogus data
        string phoneNumber = FillTestObjects.GetSingleEntryWhiteList().
            First().PhoneNumber;
        // Stub th call to MakeCall() so that it looks as if a call was made.
        phone.Expect(x => x.MakeCall(phoneNumber)).
            WhenCalled(invocation =>
                       {
                           phone.CurrentNumber = phoneNumber;
                           phone.InCall = true;
                       });

       //Act
        // Select the phone number
        deviceControlForm.SelectedNumber = phoneNumber;
        // Press the call button to make a call.
        deviceMediator.CallButtonPressed();

       //Assert
        Assert.IsTrue(phone.InCall);
        Assert.IsTrue(phone.CurrentNumber == phoneNumber);
    }

Answer 1

Refactor the setup to another method and call that method from both tests. Tests should not call other tests.