Add a test-suite for in-server unit-testing.

This patch adds a test/ directory that contains the setup for a unit-testing
suite designed for in-server unit-testing. All functions available to the X
server are available to the test binaries through static linking.

This test suite uses the glib testing framework.
Do not use glib calls outside of the test/ directory.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

test/README

@@ -0,0 +1,36 @@
+                        X server test suite
+
+This suite contains a set of tests to verify the behaviour of functions used
+internally to the server. This test suite is based on glib's testing
+framework [1].
+
+= How it works =
+Through some automake abuse, we link the test programs with the same static
+libraries as the Xorg binary. The test suites can then call various functions
+and verify their behaviour - without the need to start the server or connect
+clients.
+
+This testing only works for functions that do not rely on a particular state
+of the X server. Unless the test suite replicates the expected state, which
+may be difficult.
+
+= How to run the tests =
+Run "make check" the test directory. This will compile the tests and execute
+them in the order specified in the TESTS variable in test/Makefile.am.
+
+Each set of tests related to a subsystem are available as a binary that can be
+executed directly. For example, run "xkb" to perform some xkb-related tests.
+
+== Adding a new test ==
+When adding a new test, ensure that you add a short description of what the
+test does and what the expected outcome is. If the test reproduces a
+particular bug, using g_test_bug().
+
+== Misc ==
+
+The programs "gtester" and "gtester-report" may be used to generate XML/HTML
+log files of tests succeeded and failed.
+
+---------
+
+[1] http://library.gnome.org/devel/glib/stable/glib-Testing.html