unit-tests: Add option to exclude specific test suites

Listing test suites in TESTS_SUITES_EXCLUDE allows excluding specific
test suites from running.

src/libstrongswan/tests/test_runner.c

@@ -58,40 +58,57 @@ static void destroy_suite(test_suite_t *suite)
 }
 
 /**
- * Removes and destroys test suites that are not selected.
+ * Filter loaded test suites, either remove suites listed (exclude=TRUE), or all
+ * that are not listed (exclude=FALSE).
  */
-static void filter_suites(array_t *loaded)
+static void apply_filter(array_t *loaded, char *filter, bool exclude)
 {
 	enumerator_t *enumerator, *names;
-	hashtable_t *selected;
+	hashtable_t *listed;
 	test_suite_t *suite;
-	char *suites, *name;
+	char *name;
 
-	suites = getenv("TESTS_SUITES");
+	listed = hashtable_create(hashtable_hash_str, hashtable_equals_str, 8);
-	if (!suites)
+	names = enumerator_create_token(filter, ",", " ");
-	{
-		return;
-	}
-	selected = hashtable_create(hashtable_hash_str, hashtable_equals_str, 8);
-	names = enumerator_create_token(suites, ",", " ");
 	while (names->enumerate(names, &name))
 	{
-		selected->put(selected, name, name);
+		listed->put(listed, name, name);
 	}
 	enumerator = array_create_enumerator(loaded);
 	while (enumerator->enumerate(enumerator, &suite))
 	{
-		if (!selected->get(selected, suite->name))
+		if ((exclude && listed->get(listed, suite->name)) ||
+			(!exclude && !listed->get(listed, suite->name)))
 		{
 			array_remove_at(loaded, enumerator);
 			destroy_suite(suite);
 		}
 	}
 	enumerator->destroy(enumerator);
-	selected->destroy(selected);
+	listed->destroy(listed);
 	names->destroy(names);
 }
 
+/**
+ * Removes and destroys test suites that are not selected or
+ * explicitly excluded.
+ */
+static void filter_suites(array_t *loaded)
+{
+	char *filter;
+
+	filter = getenv("TESTS_SUITES");
+	if (filter)
+	{
+		apply_filter(loaded, filter, FALSE);
+	}
+	filter = getenv("TESTS_SUITES_EXCLUDE");
+	if (filter)
+	{
+		apply_filter(loaded, filter, TRUE);
+	}
+}
+
 /**
  * Load all available test suites, or optionally only selected ones.
  */

src/libstrongswan/tests/test_runner.h

@@ -70,6 +70,7 @@ struct test_configuration_t {
  * - TESTS_VERBOSITY: Numerical loglevel for debug log
  * - TESTS_STRONGSWAN_CONF: Specify a path to a custom strongswan.conf
  * - TESTS_SUITES: Run specific test suites only
+ * - TESTS_SUITES_EXCLUDE: Don't run specific test suites
  * - TESTS_REDUCED_KEYLENGTHS: Test minimal keylengths for public key tests only
  *
  * @param name			name of test runner