[PATCH v3 2/3] kunit: Add support for suite initialization and cleanup

[Bart Van Assche <bvanassche@xxxxxxx>]

A common feature of unit testing frameworks is support for sharing a test
configuration across multiple unit tests. Add this functionality to the
KUnit framework. This functionality will be used in the next patch in this
series.

Reviewed-by: Brendan Higgins <brendanhiggins@xxxxxxxxxx>
Cc: David Gow <davidgow@xxxxxxxxxx>
Cc: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
Cc: kunit-dev@xxxxxxxxxxxxxxxx
Cc: linux-kselftest@xxxxxxxxxxxxxxx
Cc: Bodo Stroesser <bostroesser@xxxxxxxxx>
Cc: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Cc: Yanko Kaneti <yaneti@xxxxxxxxxxx>
Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx>
---
 include/kunit/test.h |  4 ++++
 lib/kunit/test.c     | 14 ++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/include/kunit/test.h b/include/kunit/test.h
index 24b40e5c160b..a6eef96a409c 100644
--- a/include/kunit/test.h
+++ b/include/kunit/test.h
@@ -215,6 +215,8 @@ static inline char *kunit_status_to_ok_not_ok(enum kunit_status status)
  * struct kunit_suite - describes a related collection of &struct kunit_case
  *
  * @name:	the name of the test. Purely informational.
+ * @init_suite:	called once per test suite before the test cases.
+ * @exit_suite:	called once per test suite after all test cases.
  * @init:	called before every test case.
  * @exit:	called after every test case.
  * @test_cases:	a null terminated array of test cases.
@@ -229,6 +231,8 @@ static inline char *kunit_status_to_ok_not_ok(enum kunit_status status)
  */
 struct kunit_suite {
 	const char name[256];
+	int (*init_suite)(void);
+	void (*exit_suite)(void);
 	int (*init)(struct kunit *test);
 	void (*exit)(struct kunit *test);
 	struct kunit_case *test_cases;
diff --git a/lib/kunit/test.c b/lib/kunit/test.c
index d79ecb86ea57..c271692ced93 100644
--- a/lib/kunit/test.c
+++ b/lib/kunit/test.c
@@ -397,9 +397,19 @@ int kunit_run_tests(struct kunit_suite *suite)
 {
 	char param_desc[KUNIT_PARAM_DESC_SIZE];
 	struct kunit_case *test_case;
+	int res = 0;
 
 	kunit_print_subtest_start(suite);
 
+	if (suite->init_suite)
+		res = suite->init_suite();
+
+	if (res < 0) {
+		kunit_log(KERN_INFO, suite, KUNIT_SUBTEST_INDENT
+			  "# Suite initialization failed (%d)\n", res);
+		goto end;
+	}
+
 	kunit_suite_for_each_test_case(suite, test_case) {
 		struct kunit test = { .param_value = NULL, .param_index = 0 };
 		test_case->status = KUNIT_SKIPPED;
@@ -439,6 +449,10 @@ int kunit_run_tests(struct kunit_suite *suite)
 				      test.status_comment);
 	}
 
+	if (suite->exit_suite)
+		suite->exit_suite();
+
+end:
 	kunit_print_subtest_end(suite);
 
 	return 0;