tests: implement get_test_name()

Screenshot tests often want to use the test name for writing out images.
This is a helper to get the test name without writing it multiple times
in the source.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Emilio Pozuelo Monfort <emilio.pozuelo@collabora.co.uk>
Reviewed-by: Micah Fedke <micah.fedke@collabora.co.uk>
Reviewed-by: Quentin Glidic <sardemff7+git@sardemff7.net>

tests/weston-test-runner.c

@@ -42,6 +42,14 @@ char __attribute__((weak)) *server_parameters="";
 
 extern const struct weston_test __start_test_section, __stop_test_section;
 
+static const char *test_name_;
+
+const char *
+get_test_name(void)
+{
+	return test_name_;
+}
+
 static const struct weston_test *
 find_test(const char *name)
 {
@@ -55,8 +63,17 @@ find_test(const char *name)
 }
 
 static void
-run_test(const struct weston_test *t, void *data)
+run_test(const struct weston_test *t, void *data, int iteration)
 {
+	char str[512];
+
+	if (data) {
+		snprintf(str, sizeof(str), "%s[%d]", t->name, iteration);
+		test_name_ = str;
+	} else {
+		test_name_ = t->name;
+	}
+
 	t->run(data);
 	exit(EXIT_SUCCESS);
 }
@@ -83,7 +100,7 @@ exec_and_report_test(const struct weston_test *t, void *test_data, int iteration
 	assert(pid >= 0);
 
 	if (pid == 0)
-		run_test(t, test_data); /* never returns */
+		run_test(t, test_data, iteration); /* never returns */
 
 	if (waitid(P_ALL, 0, &info, WEXITED)) {
 		fprintf(stderr, "waitid failed: %m\n");

tests/weston-test-runner.h

@@ -80,4 +80,16 @@ struct weston_test {
 #define TEST_P(name, data) ARG_TEST(name, 0, data)
 #define FAIL_TEST_P(name, data) ARG_TEST(name, 1, data)
 
+/**
+ * Get the test name string with counter
+ *
+ * \return The test name. For an iterated test, e.g. defined with TEST_P(),
+ * the name has a '[%d]' suffix to indicate the iteration.
+ *
+ * This is only usable from code paths inside TEST(), TEST_P(), etc.
+ * defined functions.
+ */
+const char *
+get_test_name(void);
+
 #endif