tests: Add a test template

Requested by Paulo.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

tests/.gitignore

@@ -113,4 +113,5 @@ prime_self_import
 prime_udl
 sysfs_rc6_residency
 sysfs_rps
+template
 testdisplay

tests/Makefile.am

@@ -59,6 +59,7 @@ TESTS_progs_M = \
 	$(NOUVEAU_TESTS_M) \
 	pc8 \
 	prime_self_import \
+	template \
 	$(NULL)
 
 TESTS_progs = \

tests/template.c

@@ -0,0 +1,80 @@
+/*
+ * Copyright © 2013 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ *
+ */
+
+#include "drmtest.h"
+
+/*
+ * Note that test function (and code called by them) should generally not return
+ * a variable indicating success/failure. Instead use the igt_require/igt_assert
+ * macros to skip out of the entire subtest.
+ *
+ * Also, helper functions should only return a status code if the callers have a
+ * real need to differentiate. If the only thing they do is call igt_assert or a
+ * similar macro then it'll result in simpler code when the check is moved
+ * completely into the helper.
+ */
+static void test_A(int fd)
+{
+}
+
+static void test_B(int fd)
+{
+}
+
+/*
+ * Variables which are written to in igt_fixtures/subtest blocks need to be
+ * allocated outside of the relevant function scope, otherwise gcc will wreak
+ * havoc (since these magic blocks use setjmp/longjmp internally).
+ *
+ * Common practice is to put variables used in the main test function into
+ * global scope, but only right above the main function itself (to avoid leaking
+ * it into other functions).
+ */
+
+int drm_fd;
+
+igt_main
+{
+	igt_fixture {
+		drm_fd = drm_open_any();
+		igt_require(drm_fd >= 0);
+
+		/* Set up other interesting stuff shared by all tests. */
+	}
+
+	igt_subtest("A")
+		test_A(drm_fd);
+	igt_subtest("B")
+		test_B(drm_fd);
+	/*
+	 * Note that subtest names can be programatically generated. See the
+	 * various uses of igt_subtest_f for a few neat ideas.
+	 */
+
+	igt_fixture {
+		close(drm_fd);
+	}
+}