Adds test for xgps dependencies.

This adds a new test_xgps_deps.py, which duplicates the imports
needed by xgps and xgpsspeed, as a quick way to verify that the
proper prerequisites are in place.  It avoids the imports that
require (and connect to) an available X11 server.

TESTED:
Ran successfully with proper dependencies, and verified failure
with either cairo or gobject3 removed.

1 files changed, 19 insertions, 0 deletions

diff --git a/test_xgps_deps.py b/test_xgps_deps.py
new file mode 100755
index 00000000..d6138328
--- /dev/null
+++ b/test_xgps_deps.py
@@ -0,0 +1,19 @@
+#!/usr/bin/env python
+from __future__ import print_function
+
+import sys
+
+import cairo
+
+import gi
+try:
+    gi.require_version('Gtk', '3.0')
+except (AttributeError, ValueError):
+    # Explain the reason for the exception, then reraise
+    print('*** Need PyGObject V3 or later, and Gtk3 ***', file=sys.stderr)
+    raise
+from gi.repository import GObject    # pylint: disable=wrong-import-position
+# Skip the imports that require X11
+### from gi.repository import Gtk    # pylint: disable=wrong-import-position
+### from gi.repository import Gdk    # pylint: disable=wrong-import-position
+### from gi.repository import Pango  # pylint: disable=wrong-import-position