Use pytest-vcr to avoid network usage

.appveyor.yml

@@ -21,6 +21,7 @@ install:
   - set PACKAGES=%PACKAGES% pillow pytest filelock pep8 pyshp shapely six requests pyepsg owslib
   - conda create -n %ENV_NAME% python=%PYTHON_VERSION% %PACKAGES%
   - activate %ENV_NAME%
+  - pip install pytest-vcr
   - set INCLUDE=%CONDA_PREFIX%\Library\include;%INCLUDE%
   - set LIB=%CONDA_PREFIX%\Library\lib;%LIB%
 
@@ -38,7 +39,10 @@ build_script:
 
 test_script:
   - set MPLBACKEND=Agg
-  - pytest --pyargs cartopy
+  # These are invalid, but ensure the tests aren't skipped. A valid response is
+  # returned from vcrpy regardless of authentication.
+  - set SRTM_USERNAME=username SRTM_PASSWORD=password
+  - pytest --vcr-record=none --pyargs cartopy
 
 artifacts:
   - path: cartopy_test_output

.travis.yml

@@ -48,6 +48,7 @@ install:
   # ---------------------------------
   - PACKAGES="$PACKAGES pillow pytest pytest-xdist filelock pep8 pyshp shapely six requests pyepsg owslib"
   - conda install --quiet $PACKAGES
+  - pip install pytest-vcr
 
   # Conda debug
   # -----------
@@ -68,12 +69,22 @@ script:
   # Check that the downloader tool at least knows where to get the data from (but don't actually download it)
   - python $TRAVIS_BUILD_DIR/tools/feature_download.py gshhs physical --dry-run
 
-  - if [[ "$NAME" == "Latest everything"* ]]; then
-      CARTOPY_GIT_DIR=$TRAVIS_BUILD_DIR pytest -n 4 --doctest-modules --pyargs cartopy;
+  - |
+    PYTEST_ARGS=
+    if [[ "$NAME" == "Latest everything"* ]]; then
+      PYTEST_ARGS="$PYTEST_ARGS --doctest-modules"
+    fi
+    if [[ "$TRAVIS_EVENT_TYPE" == "cron" ]]; then
+      PYTEST_ARGS="$PYTEST_ARGS --disable-vcr"
     else
-      CARTOPY_GIT_DIR=$TRAVIS_BUILD_DIR pytest -n 4 --pyargs cartopy;
+      PYTEST_ARGS="$PYTEST_ARGS --vcr-record=none"
+      # These are invalid, but ensure the tests aren't skipped. A valid
+      # response is returned from vcrpy regardless of authentication.
+      export SRTM_USERNAME=username SRTM_PASSWORD=password
     fi
 
+  - CARTOPY_GIT_DIR=$TRAVIS_BUILD_DIR pytest -n 4 $PYTEST_ARGS --pyargs cartopy;
+
 after_failure:
   - source activate $ENV_NAME
   - python -c "from __future__ import print_function; import cartopy.tests.mpl; print(cartopy.tests.mpl.failed_images_html())"

lib/cartopy/tests/cassettes/test_crs/TestCRS.test_epsg.yaml

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