Add offline testing to CI (#952)

* Setup offline testing in CI

* Remove option

* Move network-accessing fixtures init into a pytest fixture

Move the OSHFixtures class into a pytest fixture to defer initializing
it (and therefore accessing the Internet) until the relevant test
functions are called.  This makes it possible for `pytest.mark.online`
to correctly skip them.  It also avoids initializing the fixtures class
multiple times -- now it should be initialized once per session.

While at it, move the global functions into the OSHFixtures class.  It
would need to access the class members anyway, and this seems cleaner
than passing its instance explicitly.

---------

Co-authored-by: Michał Górny <[email protected]>

.github/workflows/main.yml

@@ -27,6 +27,15 @@ jobs:
         pip3 install -r docs/requirements.txt
     - name: run tests ⚙️
       run: python3 -m pytest
+    - name: run tests in offline mode
+      if: matrix.python-version == '3.10'
+      run: |
+          python3 -m pytest \
+            -m "not online" \
+            --disable-socket \
+            --deselect="tests/doctests/wcs_thredds.txt::wcs_thredds.txt" \
+            --deselect="tests/doctests/wfs_MapServerWFSCapabilities.txt::wfs_MapServerWFSCapabilities.txt" \
+            --deselect="tests/doctests/wms_geoserver_mass_gis.txt::wms_geoserver_mass_gis.txt"
     - name: run coveralls ⚙️
       run: coveralls
     - name: build docs 🏗️

requirements-dev.txt

@@ -2,6 +2,7 @@
 flake8
 pytest
 pytest-cov
+pytest-socket
 Pillow
 tox
 twine

tests/test_csw_geonetwork.py

@@ -19,6 +19,7 @@ def test_csw_geonetwork():
 
 SERVICE_URL3 = 'https://metawal.wallonie.be/geonetwork/srv/eng/csw'
 
+@pytest.mark.online
 @pytest.mark.skipif(not service_ok(SERVICE_URL3),
                     reason='service is unreachable')
 @pytest.mark.parametrize("esn_in", ['full', 'summary'])