test: add basic barebox self-test infrastructure

Self tests is code written to run within barebox to exercise
functionality. They offer flexibility to test specific units of barebox
instead of the program as a whole. Add a very simple infrastructure
for registering and executing self-tests. This is based on the Linux
kselftest modules. We don't utilize modules for this, however, because
we only have module support on ARM, but we need a generic solution.

Selftests can be enabled individually and even tested without shell
support to allow tests to happen for size-restricted barebox images
as well.

Acked-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20210604084704.17410-8-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

5 files changed, 67 insertions, 0 deletions

diff --git a/test/Kconfig b/test/Kconfig
new file mode 100644
index 0000000000..eece702e68
--- /dev/null
+++ b/test/Kconfig
@@ -0,0 +1,8 @@
+menuconfig TEST
+	bool "Testing"
+
+if TEST
+
+source "test/self/Kconfig"
+
+endif
diff --git a/test/Makefile b/test/Makefile
new file mode 100644
index 0000000000..1b9eb2171a
--- /dev/null
+++ b/test/Makefile
@@ -0,0 +1 @@
+obj-y += self/
diff --git a/test/self/Kconfig b/test/self/Kconfig
new file mode 100644
index 0000000000..720abeffc5
--- /dev/null
+++ b/test/self/Kconfig
@@ -0,0 +1,33 @@
+# SPDX-License-Identifier: GPL-2.0
+
+config SELFTEST
+	bool "Self-tests"
+	help
+	  Configures support for in-barebox testing
+
+if SELFTEST
+
+config CMD_SELFTEST
+	bool "selftest command"
+	depends on COMMAND_SUPPORT
+	help
+	  Command to run enabled barebox self-tests.
+	  If run without arguments, all tests are run
+
+	  Usage: selftest [-l] [tests...]
+
+	  Options:
+	    -l     list available tests
+
+config SELFTEST_AUTORUN
+	bool "Run self-tests on startup"
+	help
+	  Self tests are run automatically after initcalls are done,
+	  but before barebox_main (shell or board-specific startup).
+
+config SELFTEST_ENABLE_ALL
+	bool "Enable all self-tests"
+	help
+	  Selects all self-tests compatible with current configuration
+
+endif
diff --git a/test/self/Makefile b/test/self/Makefile
new file mode 100644
index 0000000000..78f738c8e2
--- /dev/null
+++ b/test/self/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0
+
+obj-$(CONFIG_SELFTEST) += core.o
diff --git a/test/self/core.c b/test/self/core.c
new file mode 100644
index 0000000000..caa4c27f6d
--- /dev/null
+++ b/test/self/core.c
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#define pr_fmt(fmt) "bselftest: " fmt
+
+#include <common.h>
+#include <bselftest.h>
+
+LIST_HEAD(selftests);
+
+void selftests_run(void)
+{
+	struct selftest *test;
+	int err = 0;
+
+	pr_notice("Configured tests will run now\n");
+
+	list_for_each_entry(test, &selftests, list)
+		err |= test->func();
+
+	if (err)
+		pr_err("Some selftests failed\n");
+}