tests: Make tests a build option

And don't skip tests if any test dependencies are missing.

.gitlab-ci.yml

@@ -25,7 +25,7 @@ build_stable:
     - dnf update -y && dnf install -y $DEPENDENCIES
     - dnf reinstall -y glib2
   script:
-    - meson -Dgtk_doc=true -Dgtk-tests=true _build
+    - meson -Dtests=true -Dgtk_doc=true -Dgtk-tests=true _build
     - ninja -v -C _build
     - ninja -v -C _build install
     - ninja -v -C _build uninstall

README.md

@@ -14,6 +14,10 @@ $ ninja -v -C _build install
 ```
 It requires libgudev, systemd (>= 233 for the accelerometer quirks) and polkit-gobject.
 
+Running the tests will require gobject-introspection support for Python,
+[python-dbusmock](https://github.com/martinpitt/python-dbusmock/),
+[umockdev](https://github.com/martinpitt/umockdev) and [psutil](https://github.com/giampaolo/psutil).
+
 Usage
 -----
 

meson.build

@@ -66,4 +66,19 @@ if get_option('gtk_doc')
   subdir('docs')
 endif
 
-subdir('tests')
+if get_option('tests')
+  # Python 3 required modules
+  python3_required_modules = ['psutil', 'dbusmock', 'gi']
+
+  python = import('python')
+  python3 = python.find_installation('python3')
+  foreach p : python3_required_modules
+    # Source: https://docs.python.org/3/library/importlib.html#checking-if-a-module-can-be-imported
+    script = 'import importlib.util; import sys; exit(1) if importlib.util.find_spec(\''+ p +'\') is None else exit(0)'
+    if run_command(python3, '-c', script, check: false).returncode() != 0
+      error('Python3 module \'' + p + '\' required for running tests but not found')
+    endif
+  endforeach
+
+  subdir('tests')
+endif

meson_options.txt

@@ -6,6 +6,10 @@ option('systemdsystemunitdir',
        description: 'systemd unit directory',
        type: 'string',
        value: 'auto')
+option('tests',
+       description: 'Whether to run tests',
+       type: 'boolean',
+       value: false)
 option('gtk-tests',
        description: 'Whether to build GTK tests',
        type: 'boolean',

tests/integration-test.py

@@ -21,32 +21,27 @@
 import os
 import sys
 import dbus
+import dbusmock
+import gi
 import tempfile
-import subprocess
 import psutil
+import subprocess
 import unittest
 import time
 
 try:
-    import gi
     from gi.repository import GLib
     from gi.repository import Gio
 except ImportError as e:
-    sys.stderr.write('Skipping tests, PyGobject not available for Python 3, or missing GI typelibs: %s\n' % str(e))
-    sys.exit(0)
+    sys.stderr.write('PyGobject not available for Python 3, or missing GI typelibs: %s\n' % str(e))
+    sys.exit(1)
 
 try:
     gi.require_version('UMockdev', '1.0')
     from gi.repository import UMockdev
 except ImportError:
-    sys.stderr.write('Skipping tests, umockdev not available (https://github.com/martinpitt/umockdev)\n')
-    sys.exit(0)
-
-try:
-    import dbusmock
-except ImportError:
-    sys.stderr.write('Skipping tests, python-dbusmock not available (http://pypi.python.org/pypi/python-dbusmock).\n')
-    sys.exit(0)
+    sys.stderr.write('umockdev not available (https://github.com/martinpitt/umockdev)\n')
+    sys.exit(1)
 
 
 SP = 'net.hadess.SensorProxy'