[Qgis-developer] Changes to vector layers persist between python integration tests.

[John Stevenson]

Hi,

I am having trouble with integration tests that I am writing in a Python plugin.  The tests run correctly one at a time, but when I run them together only the first test works correctly.  It seems that changes it makes to the database are still present in the later tests.  How can I make sure that the vector layer / database is fully reset between tests?

My tests are based on unittest.TestCase.  The QGIS app is started with QGISAPP.initQGIS() as in the main QGIS tests and a Mock iface is used.

In the setUp, I make a temporary copy of a template spatialite file and run an SQL script on it to add features and other data.  I connect to the database and store a reference to it (self.db).  Then I load one of the tables as a QgsVectorLayer and store a reference to it (self.esu).

The first test uses self.esu.dataProvider().deleteFeatures() to remove features, the second uses self.esu.dataProvider().addFeatures() to add features.  They check that the features have been added and that other database changes have been made.

The teardown contains the following:

        if self.db:  # Just in case self.db doesn't get set
            self.db.close()
            del self.db
            QSqlDatabase.removeDatabase('integration_testing')

        self.esu = None
        reg = QgsMapLayerRegistry.instance()
        reg.removeAllMapLayers()
        reg.clearAllLayerCaches()

        if os.path.exists(self.test_db_path):
            os.remove(self.test_db_path)

I thought that this would be enough to reset any references to the vector layer, but if I delete a feature in the first test, it is still gone when I run the second test.  Is QGIS holding any other references to the layers that I have missed?

Cheers
John


John Stevenson
Senior Developer


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