kunit: Kconfig: enable a KUNIT_ALL_TESTS fragment

Make it easier to enable all KUnit fragments.  This is useful for kernel
devs or testers, so its easy to get all KUnit tests enabled and if new
gets added they will be enabled as well.  Fragments that has to be
builtin will be missed if CONFIG_KUNIT_ALL_TESTS is set as a module.
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

lib/kunit/Kconfig

@@ -41,4 +41,18 @@ config KUNIT_EXAMPLE_TEST
 	  is intended for curious hackers who would like to understand how to
 	  use KUnit for kernel development.
 
+config KUNIT_ALL_TESTS
+	tristate "All KUnit tests with satisfied dependencies"
+	help
+	  Enables all KUnit tests, if they can be enabled.
+	  KUnit tests run during boot and output the results to the debug log
+	  in TAP format (http://testanything.org/). Only useful for kernel devs
+	  running the KUnit test harness, and not intended for inclusion into a
+	  production build.
+
+	  For more information on KUnit and unit tests in general please refer
+	  to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+	  If unsure, say N.
+
 endif # KUNIT