Test driving-qml
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Test-Driving QMLHelsinki
Artem MarchenkoHelsinki Qt Meetup
May 15, 2012
Artem Marchenko
Principal engineer in a startup connecting grannies to grandchildren
Product Manager shipping multi-
hundred MEur productsThree times Forum Nokia Champion
Qt Ambassador (with 40K+ Nokia N9 app downloads)Scrum Master, Practitioner,
Product Owner and Coach
Engineer, product manager, coach
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.gitCloning 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/qmake qtest-qml.pro makemake installmake docsmake check
Project page: http://qt.gitorious.net/qt-labs/qtest-qml
Getting started 2(3)
• Create the simplest test in your project
Getting started 3(2)
• 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
– 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 (possibly fixed for 4.8)
– 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. Is supposed to be fixed for Qt 5.0• 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
My company TwineLAB Oy
• Startup with proven financing• We need more people excited about high quality software
and bringing end-to-end products to people
• Buzzwords: – Qt/QML– Linux platform– high quality SW– video/audio codecs– server-side Java / GWT– large-scale metrics
Q&As time
You can find these [and nearly identical older version of the same] slides at http
://agilesoftwaredevelopment.com/tags/tdd
Further contacts: http://fi.linkedin.com/in/artemmarchenko