How to write unit test depends on MessageBox?

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I use NUnit to test unit and I have a method:

C#

class abc
   {
      private int a;
      public void myMethod()
      {
           if(MessageBox.Show("Sure?","Title", MessageBoxButtons.YesNo) == DialogResult.Yes)
                 a = 1;
           else
                 a = 0;
      }
   }

How do I write NUnit to test this method? Sorry for my English.
Thank you very much.

Posted 11-May-15 20:07pm

Trung Tuyen Tran

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Comments

Sergey Alexandrovich Kryukov 12-May-15 2:15am

Read NUnit documentation; development of tests is fairly simple. What exactly do you want to test?
—SA

Trung Tuyen Tran 12-May-15 2:20am

Hi Sergey Alexandrovich Kryukov,
When I call the method in TestProject , It show a messagebox and I should click button Yes or No . I want auto set value for MessageBox. Can I do that?
Thank you.

Sergey Alexandrovich Kryukov 12-May-15 2:25am

Not clear. Why? Please describe the whole idea and the problem from the very beginning to the end.
—SA

Trung Tuyen Tran 12-May-15 2:47am

this is my class and method :

class abc
{
public int myMethod()
{
if(MessageBox.Show("Sure?","Title", MessageBoxButtons.YesNo) == DialogResult.Yes)
return 1;
else
return 0;
}
}

And this is my TestMethod

[Test]
public void TestMyMethod()
{
abc x = new abc();
int expect = 1;
int actual = x.myMethod();
Assert.AreEqual(expect, actual);
}
When I run TestMyMethod() . It had a messagebox . I must click button YES(DialogResult.Yes) or button NO (DialogResult.No) . I don't want show the messagebox . I want auto set value is DialogResult.Yes

1 solution

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CHill60 · Answer 1 · 2015-05-11T23:51:00

Solution 1

You could have a look at NUnitForms[^] or change myMethod to take a flag to say whether or not to show the message e.g.

C#

public int myMethod(bool ShowMessage = true)
{
    int retVal = 1;
    if (ShowMessage)
        retVal = (MessageBox.Show("Sure?", "Title", MessageBoxButtons.YesNo) == DialogResult.Yes) ? 1 : 0;

    return retVal;
}

Note however, changing the application to suit the test in this way isn't recommended.

Posted 11-May-15 23:51pm

CHill60

Comments

Trung Tuyen Tran 12-May-15 6:10am

Hi Chill60,

Thank you so much but this is function of another people . I'm not allowed to change it. And don't allowed to use NUnitForm . So do you have an other solution? .

Thank you so much

CHill60 12-May-15 7:25am

If you are allowed to use NUnit why are you not allowed to use the extension NUnitForms? Seems strange.
However, the only other way I can think of is to inject a replacement for the MessageBox functionality - I found this SO post[^] discusses that method

Philippe Mori 12-May-15 19:57pm

If you are not allowed to do anything, then we cannot help you...