MATLAB Programming Fundamentals - MathWorks

Write Test That Uses App Testing and Mocking

Frameworks

This example shows how to write a test that uses the app testing framework and the

mocking framework. The app contains a file selection dialog box and a label indicating the

selected file. To test the app programmatically, use a mock object to define the behavior of

the file selector.

Create App

Create the launchApp app in your current working folder. The app allows a user to select

an input file and displays the name of the file in the app. The file selection dialog box is a

blocking modal dialog box that waits for user input.

function app = launchApp

f = uifigure;

button = uibutton(f,'Text','Input file');

button.ButtonPushedFcn = @(src,evt)pickFile;

label = uilabel(f,'Text','No file selected');

label.Position(1) = button.Position(1) + button.Position(3) + 25;

label.Position(3) = 200;

% Add components to an App struct for output

app.UIFigure = f;

app.Button = button;

app.Label = label;

function file = pickFile()

[file,folder,status] = uigetfile('*.*');

if status

label.Text = file;

end

end

end

To explore the properties of this app prior to testing, create an instance of the app at the

command prompt. This step is not necessary for the tests, but it is helpful to explore the

properties used by the app tests. For example, use app.Button to access the Input file

button within the app object.

app = launchApp;

33 Unit Testing