Model Test: Difference between revisions
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= Model Test = | = Model Test = | ||
ModelTest provides a way to check for common errors in implementations of | ModelTest provides a way to check for common errors in implementations of "QAbstractItemModel":http://doc.qt.nokia.com/qabstractitemmodel.html. | ||
ModelTest continuously checks a model as it changes, helping to verify the state and catching many common errors the moment they show up. | ModelTest continuously checks a model as it changes, helping to verify the state and catching many common errors the moment they show up. | ||
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To use the model test do the following: | To use the model test do the following: | ||
# Include the pri file at the end of your project pro file using the include() command like so: | # Include the pri file at the end of your project pro file using the include() command like so: | ||
''include(../path/to/dir/modeltest.pri)'' | |||
# Then in your source include | # Then in your source include "modeltest.h" and instantiate ModelTest with your model so the test can live for the lifetime of your model. For example: | ||
<code>#include <modeltest.h> | |||
QDirModel *model = new QDirModel(this); | QDirModel *model = new QDirModel(this); | ||
new ModelTest(model, this);</code> | |||
# That is it. When the test finds a problem it will assert. modeltest.cpp contains some hints on how to fix problems that the test finds. | # That is it. When the test finds a problem it will assert. modeltest.cpp contains some hints on how to fix problems that the test finds. | ||
The source can be found | The source can be found "here":http://qt.gitorious.org/qt/qt/trees/4.7/tests/auto/modeltest | ||
Revision as of 09:08, 25 February 2015
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Model Test
ModelTest provides a way to check for common errors in implementations of "QAbstractItemModel":http://doc.qt.nokia.com/qabstractitemmodel.html.
ModelTest continuously checks a model as it changes, helping to verify the state and catching many common errors the moment they show up.
http://developer.qt.nokia.com/uploads/image_upload/Modeltest.png
Some of the conditions caught include:
- Verifying X number of rows have been inserted in the correct place after the signal rowsAboutToBeInserted() says X rows will be inserted.
- The parent of the first index of the first row is a QModelIndex()
- Calling index() twice in a row with the same values will return the same QModelIndex
- If rowCount() says there are X number of rows, model test will verify that is true.
- Many possible off by one bugs
- hasChildren() returns true if rowCount() is greater then zero.
- and many more…
To use the model test do the following:
- Include the pri file at the end of your project pro file using the include() command like so:
include(../path/to/dir/modeltest.pri)
- Then in your source include "modeltest.h" and instantiate ModelTest with your model so the test can live for the lifetime of your model. For example:
#include <modeltest.h>
QDirModel *model = new QDirModel(this);
new ModelTest(model, this);
- That is it. When the test finds a problem it will assert. modeltest.cpp contains some hints on how to fix problems that the test finds.
The source can be found "here":http://qt.gitorious.org/qt/qt/trees/4.7/tests/auto/modeltest