Correctly propagate failures in cocotb_test rule

The previous rule implementation did not check whether the test passed
or failed in the cocotb runner. The additional check introduced in this
commit allows the script to inform Bazel about the actual test results.

Internal-tag: [#46586]
Signed-off-by: Robert Winkler <[email protected]>

Author: rw1nkler

cocotb/cocotb_wrapper.py

@@ -13,7 +13,7 @@
 # limitations under the License.
 
 import argparse
-from cocotb.runner import get_runner
+from cocotb.runner import get_runner, check_results_file
 
 
 cocotb_build_flags = [
@@ -167,6 +167,6 @@ def __call__(self, parser, namespace, values, option_string=None):
     test_flags = filter_args(vars(args), cocotb_test_flags)
 
     runner = get_runner(args.sim)
-
     runner.build(**build_flags)
-    runner.test(**test_flags),
+    results_xml = runner.test(**test_flags)
+    check_results_file(results_xml)