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If selected, then the images output by composer will include only the area of the composition with content. There's also an option for margins to add around the item bounds if required. If the composition includes a single page, then the output will be sized to include EVERYTHING on the composition. If it's a multi-page composition, then each page will be cropped to only include the area of that page with items. A new image export options dialog has been added to facilitate this, which also includes handy shortcuts for overriding the print resolution or exported image dimensions. Sponsored by NIWA
QGIS unit tests
Build tests
Make sure that you have enabled building of tests in CMake.
cmake -DENABLE_TESTS=ON ..
Run tests
You can run all tests using make check.
Individual tests can be run using ctest.
For example if the output of make check ends like this:
The following tests FAILED:
77 - PyQgsLocalServer (Failed)
You could re-run the failing test with:
ctest -V -R PyQgsLocalServer
The parameter -V enables verbose mode and -R takes a regular expression as
parameter and will only run matching tests.
Advanced configuration
Postgres
To test the postgres provider you will need to have a database available to
which the postgres provider can connect. This will need to have postgis support
enabled and be available as a service called qgis_test on the machine you run
the tests on.