make test: improve test filtering

Implement fine-grained test filtering by supporting more complicated
filters beside the original file name suffix filter.

Change-Id: If5a166d08cffe8c58cc6cf174e6df861c34dbaa6
Signed-off-by: Klement Sekera <ksekera@cisco.com>

3 files changed, 81 insertions, 5 deletions

diff --git a/Makefile b/Makefile
index b50d203914e..bbbb2acfb7f 100644
--- a/Makefile
+++ b/Makefile
@@ -115,7 +115,7 @@ help:
 	@echo "                       startup.conf file is present"
 	@echo " GDB=<path>          - gdb binary to use for debugging"
 	@echo " PLATFORM=<name>     - target platform. default is vpp"
-	@echo " TEST=<name>         - only run specific test"
+	@echo " TEST=<filter>       - apply filter to test set, see test-help"
 	@echo ""
 	@echo "Current Argument Values:"
 	@echo " V            = $(V)"
diff --git a/test/Makefile b/test/Makefile
index 7a18be1d587..5c0d48f0f07 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -35,7 +35,7 @@ $(PAPI_INSTALL_DONE): $(PIP_PATCH_DONE)
 	@touch $@
 
 define retest-func
-	@bash -c "source $(PYTHON_VENV_PATH)/bin/activate && python run_tests.py discover -p test_$(TEST)\"*.py\""
+	@bash -c "source $(PYTHON_VENV_PATH)/bin/activate && python run_tests.py discover -p test_\"*.py\""
 endef
 
 test: reset verify-python-path $(PAPI_INSTALL_DONE)
@@ -111,7 +111,15 @@ help:
 	@echo "    DEBUG=gdbserver   - run gdb inside a gdb server, otherwise "
 	@echo "                        same as above"
 	@echo " STEP=[yes|no]        - ease debugging by stepping through a testcase "
-	@echo " TEST=<name>          - only run specific test"
+	@echo " TEST=<filter>        - filter the set of tests:"
+	@echo "    by file-name      - only run tests from specified file, e.g. TEST=test_bfd selects all tests from test_bfd.py"
+	@echo "    by file-suffix    - same as file-name, but 'test_' is omitted e.g. TEST=bfd selects all tests from test_bfd.py"
+	@echo "    by wildcard       - wildcard filter is <file>.<class>.<test function>, each can be replaced by '*'"
+	@echo "                        e.g. TEST='test_bfd.*.*' is equivalent to above example of filter by file-name"
+	@echo "                             TEST='bfd.*.*' is equivalent to above example of filter by file-suffix"
+	@echo "                             TEST='bfd.BFDAPITestCase.*' selects all tests from test_bfd.py which are part of BFDAPITestCase class"
+	@echo "                             TEST='bfd.BFDAPITestCase.test_add_bfd' selects a single test named test_add_bfd from test_bfd.py/BFDAPITestCase"
+	@echo "                             TEST='*.*.test_add_bfd' selects all test functions named test_add_bfd from all files/classes"
 	@echo ""
 	@echo "Creating test documentation"
 	@echo " test-doc            - generate documentation for test framework"
diff --git a/test/framework.py b/test/framework.py
index 8ceb33c3a44..889a30469ba 100644
--- a/test/framework.py
+++ b/test/framework.py
@@ -698,7 +698,7 @@ class VppTestResult(unittest.TestResult):
 
 class VppTestRunner(unittest.TextTestRunner):
     """
-    A basic test runner implementation which prints results on standard error.
+    A basic test runner implementation which prints results to standard error.
     """
     @property
     def resultclass(self):
@@ -713,6 +713,67 @@ class VppTestRunner(unittest.TextTestRunner):
                                             verbosity, failfast, buffer,
                                             resultclass)
 
+    test_option = "TEST"
+
+    def parse_test_option(self):
+        try:
+            f = os.getenv(self.test_option)
+        except:
+            f = None
+        filter_file_name = None
+        filter_class_name = None
+        filter_func_name = None
+        if f:
+            if '.' in f:
+                parts = f.split('.')
+                if len(parts) > 3:
+                    raise Exception("Unrecognized %s option: %s" %
+                                    (self.test_option, f))
+                if len(parts) > 2:
+                    if parts[2] not in ('*', ''):
+                        filter_func_name = parts[2]
+                if parts[1] not in ('*', ''):
+                    filter_class_name = parts[1]
+                if parts[0] not in ('*', ''):
+                    if parts[0].startswith('test_'):
+                        filter_file_name = parts[0]
+                    else:
+                        filter_file_name = 'test_%s' % parts[0]
+            else:
+                if f.startswith('test_'):
+                    filter_file_name = f
+                else:
+                    filter_file_name = 'test_%s' % f
+        return filter_file_name, filter_class_name, filter_func_name
+
+    def filter_tests(self, tests, filter_file, filter_class, filter_func):
+        result = unittest.suite.TestSuite()
+        for t in tests:
+            if isinstance(t, unittest.suite.TestSuite):
+                # this is a bunch of tests, recursively filter...
+                x = self.filter_tests(t, filter_file, filter_class,
+                                      filter_func)
+                if x.countTestCases() > 0:
+                    result.addTest(x)
+            elif isinstance(t, unittest.TestCase):
+                # this is a single test
+                parts = t.id().split('.')
+                # t.id() for common cases like this:
+                # test_classifier.TestClassifier.test_acl_ip
+                # apply filtering only if it is so
+                if len(parts) == 3:
+                    if filter_file and filter_file != parts[0]:
+                        continue
+                    if filter_class and filter_class != parts[1]:
+                        continue
+                    if filter_func and filter_func != parts[2]:
+                        continue
+                result.addTest(t)
+            else:
+                # unexpected object, don't touch it
+                result.addTest(t)
+        return result
+
     def run(self, test):
         """
         Run the tests
@@ -721,4 +782,11 @@ class VppTestRunner(unittest.TextTestRunner):
 
         """
         print("Running tests using custom test runner")  # debug message
-        return super(VppTestRunner, self).run(test)
+        filter_file, filter_class, filter_func = self.parse_test_option()
+        print("Active filters: file=%s, class=%s, function=%s" % (
+            filter_file, filter_class, filter_func))
+        filtered = self.filter_tests(test, filter_file, filter_class,
+                                     filter_func)
+        print("%s out of %s tests match specified filters" % (
+            filtered.countTestCases(), test.countTestCases()))
+        return super(VppTestRunner, self).run(filtered)