Test driving QML

Test-Driving QML
Artem Marchenko
March 15, 2011

Artem Marchenko
Product Manager, Researcher, Coach
Product Manager shipping multi-hundred MEur products
Scrum Master, Practitioner, Product Owner and Coach
Three times Forum Nokia Champion
Private entrepreneur
Available for hire
http://fi.linkedin.com/in/artemmarchenko

Test-Driven Development. Or just testing QML
What TDD is about
Getting started
Simple Synchronous test
Simulating mouse and keyboard actions
Asynchronous tests (verifying callbacks)
Data-driven tests
Current limitations
Q&As

Test-Driven Development
Remove duplication

Example of a QML-code developed via TDD

Getting started 1(3)
git clone git://gitorious.org/qt-labs/qtest-qml.git
Cloning into qtest-qml...
remote: Counting objects: 888, done.
remote: Compressing objects: 100% (669/669), done.
remote: Total 888 (delta 445), reused 393 (delta 187)
Receiving objects: 100% (888/888), 411.11 KiB, done.
Resolving deltas: 100% (445/445), done.
cd qtest-qml/
qmakeqtest-qml.pro
make
make install
make docs
make check
Project page: http://qt.gitorious.net/qt-labs/qtest-qml

Create the simplest test in your project

And a script that runs the test: runTests.sh in this case
#!/bin/bash
clear
/Users/artem/QtSDK/Desktop/Qt/471/gcc/bin/QMLViewer.app/Contents/MacOS/QMLViewer tst_tddCalculator2.qml

Simple synchronous tests

UI level: simulating mouse click

UI level: simulating touch and drag

Asynchronous testing: tryCompare

Asynchronous testing: SignalSpy

Data-driven tests

Current Limitations
Installation doesn’t install qtest-qml to QtCreator 2.1 Tech Preview
Not that you would need it for TDD, but if you are into “just testing” already written code, debugger may be helpful
Bug: only one TestCase is allowed: http://bugreports.qt.nokia.com/browse/QTBUG-17200
It makes init() and cleanup nearly useless
Organize your test structure by your own tools
Small difficulties comparing built-in classes (e.g. color)
toString() helps most of the time

Current limitations
Very strange errors when object/property can be accessed e.g. because of a typo
Segmentation faults, sometimes even “file not found”
In 95% of cases that is a typo or an attempt to access a non-public property

Current limitations
SignalSpy can only count
It cannot examine the signal arguments or the state of other objects
Benchmarking is a part of a qtest-qml, but doesn’t work properly
That is I failed to make it run for a given amount of times (most of the time it does just a single run)
No built-in device test runners
Though you can certainly, embed a “run tests” button right into your application

Thank you
Q&As time
You can find these slides at http://agilesoftwaredevelopment.com/tags/tdd

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Test driving QML

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Test driving QML — Presentation Transcript