Question

I’m facing a problem while unit testing my forms.

The problem is that data bindings are simply not working when the form is not visible.

Here’s some example code:

Data = new Data(); EdtText.DataBindings.Add(     new Binding('Text', Data, 'Text', false,          DataSourceUpdateMode.OnPropertyChanged)); 

and later on:

Form2 f = new Form2(); f.Data.Text = 'Test 1'; f.EdtText.Text = 'Test 2'; f.Data.Text = 'Test 3'; 

At the end the values for components are f.EdtText.Text = ‘Test 2’ and f.Data.Text = ‘Test 3’ but the expected values should be both ‘Test 3’.

Any suggestions?

Answer 1

I think you answered your own question — in order for the property change event (TextChanged) to occur the control has to be displayed. Your unit test can just do something like this:

Form2 f = new Form2(); f.Show(); Thread.Sleep(2000); // give the Form time to open f.Data.Text = 'Test 1'; Assert.AreEqual('Test 1', f.EditText.Text); f.Close(); 

Instead of exposing the Form components, you’ll probably want to use NUnitForms to get the Form controls:

TextBoxTester tb = new TextBoxTester('EditText1'); Assert.AreEqual('Test 1', tb['Text']);