test: describe naming conventions for macro UNIT_TEST

Strict naming conventions have to be followed for Python function
generate_ut_subtest() to collect C unit tests to be executed via
command 'ut'.

Describe the requirements both on the C as well on the Python side.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

include/test/test.h

@@ -41,7 +41,29 @@ struct unit_test {
 	int flags;
 };
 
-/* Declare a new unit test */
+/**
+ * UNIT_TEST() - create linker generated list entry for unit a unit test
+ *
+ * The macro UNIT_TEST() is used to create a linker generated list entry. These
+ * list entries are enumerate tests that can be execute using the ut command.
+ * The list entries are used both by the implementation of the ut command as
+ * well as in a related Python test.
+ *
+ * For Python testing the subtests are collected in Python function
+ * generate_ut_subtest() by applying a regular expression to the lines of file
+ * u-boot.sym. The list entries have to follow strict naming conventions to be
+ * matched by the expression.
+ *
+ * Use UNIT_TEST(foo_test_bar, _flags, foo_test) for a test bar in test suite
+ * foo that can be executed via command 'ut foo bar' and is implemented in
+ * function foo_test_bar().
+ *
+ * @_name:	concatenation of name of the test suite, "_test_", and the name
+ *		of the test
+ * @_flags:	an integer field that can be evaluated by the test suite
+ *		implementation
+ * @_suite:	name of the test suite concatenated with "_test"
+ */
 #define UNIT_TEST(_name, _flags, _suite)				\
 	ll_entry_declare(struct unit_test, _name, _suite) = {		\
 		.file = __FILE__,					\

test/py/tests/test_ut.py

@@ -22,7 +22,22 @@ def test_ut_dm_init(u_boot_console):
             fh.write(data)
 
 def test_ut(u_boot_console, ut_subtest):
-    """Execute a "ut" subtest."""
+    """Execute a "ut" subtest.
+
+    The subtests are collected in function generate_ut_subtest() from linker
+    generated lists by applying a regular expression to the lines of file
+    u-boot.sym. The list entries are created using the C macro UNIT_TEST().
+
+    Strict naming conventions have to be followed to match the regular
+    expression. Use UNIT_TEST(foo_test_bar, _flags, foo_test) for a test bar in
+    test suite foo that can be executed via command 'ut foo bar' and is
+    implemented in C function foo_test_bar().
+
+    Args:
+        u_boot_console (ConsoleBase): U-Boot console
+        ut_subtest (str): test to be executed via command ut, e.g 'foo bar' to
+            execute command 'ut foo bar'
+    """
 
     output = u_boot_console.run_command('ut ' + ut_subtest)
     assert output.endswith('Failures: 0')