matplotlib
diff --git a/‎azure-pipelines.yml
Copy file name to clipboardExpand all lines: azure-pipelines.yml
+30Lines changed: 30 additions & 0 deletions b/‎azure-pipelines.yml
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+30Lines changed: 30 additions & 0 deletions
diff --git a/‎lib/matplotlib/tests/test_backends_interactive.py
Copy file name to clipboardExpand all lines: lib/matplotlib/tests/test_backends_interactive.py
+3-2Lines changed: 3 additions & 2 deletions b/‎lib/matplotlib/tests/test_backends_interactive.py
Copy file name to clipboardExpand all lines: lib/matplotlib/tests/test_backends_interactive.py
+3-2Lines changed: 3 additions & 2 deletions
@@ -96,6 +96,32 @@ steps:
     python -m pip install --upgrade pip
     python -m pip install -r requirements/testing/travis_all.txt -r requirements/testing/travis_extra.txt ||
       [[ "$PYTHON_VERSION" = 'Pre' ]]
+    if [[ "$PYTHON_VERSION" != 'Pre' ]]; then
+      # GUI toolkits are pip-installable only for some versions of Python so
+      # don't fail if we can't install them.  Make it easier to check whether the
+      # install was successful by trying to import the toolkit (sometimes, the
+      # install appears to be successful but shared libraries cannot be loaded at
+      # runtime, so an actual import is a better check).
+      python -mpip install --upgrade pycairo cairocffi>=0.8
+      python -mpip install --upgrade PyGObject &&
+        python -c 'import gi; gi.require_version("Gtk", "3.0"); from gi.repository import Gtk' &&
+        echo 'PyGObject is available' ||
+        echo 'PyGObject is not available'
+      python -mpip install --upgrade pyqt5 &&
+        python -c 'import PyQt5.QtCore' &&
+        echo 'PyQt5 is available' ||
+        echo 'PyQt5 is not available'
+      python -mpip install --upgrade pyside2 &&
+        python -c 'import PySide2.QtCore' &&
+        echo 'PySide2 is available' ||
+        echo 'PySide2 is not available'
+      python -mpip install --upgrade \
+        -f https://extras.wxpython.org/wxPython4/extras/linux/gtk3/ubuntu-16.04 \
+        wxPython &&
+        python -c 'import wx' &&
+        echo 'wxPython is available' ||
+        echo 'wxPython is not available'
+    fi
   displayName: 'Install dependencies with pip'
 
 - bash: |
@@ -107,6 +133,10 @@ steps:
   displayName: 'print env'
 
 - bash: |
+    if [[ "$(python -c 'import sys; print(sys.platform)')" = linux ]]; then
+      Xvfb :99 &
+      export DISPLAY=:99
+    fi
     PYTHONFAULTHANDLER=1 python -m pytest --junitxml=junit/test-results.xml -raR --maxfail=50 --timeout=300 --durations=25 --cov-report= --cov=lib -n 2 ||
       [[ "$PYTHON_VERSION" = 'Pre' ]]
   displayName: 'pytest'
 
@@ -13,7 +13,7 @@
 
 
 # Minimal smoke-testing of the backends for which the dependencies are
-# PyPI-installable on Travis.  They are not available for all tested Python
+# PyPI-installable on CI.  They are not available for all tested Python
 # versions so we don't fail on missing backends.
 
 def _get_testable_interactive_backends():
@@ -28,10 +28,11 @@ def _get_testable_interactive_backends():
             (["tkinter"], "tkagg"),
             (["wx"], "wx"),
             (["wx"], "wxagg"),
+            (["matplotlib.backends.backend_macosx"], "macosx"),
     ]:
         reason = None
         missing = [dep for dep in deps if not importlib.util.find_spec(dep)]
-        if not os.environ.get("DISPLAY"):
+        if sys.platform == "linux" and not os.environ.get("DISPLAY"):
             reason = "$DISPLAY is unset"
         elif missing:
             reason = "{} cannot be imported".format(", ".join(missing))