[PATCH v3 3/3] tests/Makefile: add AVOCADO_TESTS option to make check-acceptance

[Willian Rampazzo <willianr@redhat.com>]

Add the possibility of running all the tests from a single file, or
multiple files, running a single test within a file or multiple tests
within multiple files using `make check-acceptance` and the
AVOCADO_TESTS environment variable.

Suggested-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Willian Rampazzo <willianr@redhat.com>
---
 docs/devel/testing.rst | 27 +++++++++++++++++++++++++++
 tests/Makefile.include |  5 ++++-
 2 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/docs/devel/testing.rst b/docs/devel/testing.rst
index c9f6b97f87..64c9744795 100644
--- a/docs/devel/testing.rst
+++ b/docs/devel/testing.rst
@@ -746,6 +746,33 @@ tags, see:
 
  https://avocado-framework.readthedocs.io/en/latest/guides/user/chapters/tags.html
 
+To run a single test file, a couple of them, or a test within a file
+using the ``make check-acceptance`` command, set the ``AVOCADO_TESTS``
+environment variable with the test files or test names. To run all
+tests from a single file, use:
+
+ .. code::
+
+  make check-acceptance AVOCADO_TESTS=$FILEPATH
+
+The same is valid to run tests from multiple test files:
+
+ .. code::
+
+  make check-acceptance AVOCADO_TESTS='$FILEPATH1 $FILEPATH2'
+
+To run a single test within a file, use:
+
+ .. code::
+
+  make check-acceptance AVOCADO_TESTS=$FILEPATH:$TESTCLASS.$TESTNAME
+
+The same is valid to run single tests from multiple test files:
+
+ .. code::
+
+  make check-acceptance AVOCADO_TESTS='$FILEPATH1:$TESTCLASS1.$TESTNAME1 $FILEPATH2:$TESTCLASS2.$TESTNAME2'
+
 The scripts installed inside the virtual environment may be used
 without an "activation".  For instance, the Avocado test runner
 may be invoked by running:
diff --git a/tests/Makefile.include b/tests/Makefile.include
index f6484e5b31..e69c4fae53 100644
--- a/tests/Makefile.include
+++ b/tests/Makefile.include
@@ -88,6 +88,9 @@ clean-tcg: $(CLEAN_TCG_TARGET_RULES)
 TESTS_VENV_DIR=$(BUILD_DIR)/tests/venv
 TESTS_VENV_REQ=$(SRC_PATH)/tests/requirements.txt
 TESTS_RESULTS_DIR=$(BUILD_DIR)/tests/results
+ifndef AVOCADO_TESTS
+	AVOCADO_TESTS=tests/acceptance
+endif
 # Controls the output generated by Avocado when running tests.
 # Any number of command separated loggers are accepted.  For more
 # information please refer to "avocado --help".
@@ -136,7 +139,7 @@ check-acceptance: check-venv $(TESTS_RESULTS_DIR) get-vm-images
             $(if $(AVOCADO_TAGS),, --filter-by-tags-include-empty \
 			--filter-by-tags-include-empty-key) \
             $(AVOCADO_CMDLINE_TAGS) \
-            $(if $(GITLAB_CI),,--failfast) tests/acceptance, \
+            $(if $(GITLAB_CI),,--failfast) $(AVOCADO_TESTS), \
             "AVOCADO", "tests/acceptance")
 
 # Consolidated targets
-- 
2.31.1