New in version 2.0.
pytest-qt includes a fixture that helps testing
QAbstractItemModel implementations. The implementation is copied
from the C++ code as described on the Qt Wiki,
and it continuously checks a model as it changes, helping to verify the state
and catching many common errors the moment they show up.
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
index()twice in a row with the same values will return the same
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 it, create an instance of your model implementation, fill it with some
items and call
def test_standard_item_model(qtmodeltester): model = QStandardItemModel() items = [QStandardItem(str(i)) for i in range(4)] model.setItem(0, 0, items) model.setItem(0, 1, items) model.setItem(1, 0, items) model.setItem(1, 1, items) qtmodeltester.check(model)
If the tester finds a problem the test will fail with an assert pinpointing the issue.
Starting with PyQt5 5.11, Qt’s
QAbstractItemModelTester is exposed to Python.
If it’s available, by default,
qtmodeltester.check will use the C++
implementation and fail tests if it emits any warnings.
To use the Python implementation instead, use