oeqa/concurrenttest: Patch subunit module to handle classSetup failures

Currently setupClass errors were not being mapped back to the failing tests
and they were hence being marked as UNKNOWN and the test statistics were
inaccurate.

This is because whilst the errors were being encoded into the test results
stream, the decoder doesn't cope with an error outside a testStart event.

We patch in an addError handler to the outsideTest parser so that this
does get handled in a way similar to the non-concurrent case.

It would be nice if we didn't have to do this but there doesn't seem
to be any other way to fix this other than forking subunit.

We also make a minor change so another of our changes can cope with
tests without a start time.

(From OE-Core rev: 8f7352ed9c1a3e82689b842b7f87e469ebf2e48f)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/core/utils/concurrencytest.py

@@ -21,6 +21,7 @@ import testtools
 import threading
 import time
 import io
+import subunit
 
 from queue import Queue
 from itertools import cycle
@@ -53,10 +54,11 @@ class BBThreadsafeForwardingResult(ThreadsafeForwardingResult):
     def _add_result_with_semaphore(self, method, test, *args, **kwargs):
         self.semaphore.acquire()
         try:
-            self.result.starttime[test.id()] = self._test_start.timestamp()
-            self.result.threadprogress[self.threadnum].append(test.id())
-            totalprogress = sum(len(x) for x in self.result.threadprogress.values())
-            self.result.progressinfo[test.id()] = "%s: %s/%s %s/%s (%ss) (%s)" % (
+            if self._test_start:
+                self.result.starttime[test.id()] = self._test_start.timestamp()
+                self.result.threadprogress[self.threadnum].append(test.id())
+                totalprogress = sum(len(x) for x in self.result.threadprogress.values())
+                self.result.progressinfo[test.id()] = "%s: %s/%s %s/%s (%ss) (%s)" % (
                     self.threadnum,
                     len(self.result.threadprogress[self.threadnum]),
                     self.totalinprocess,
@@ -68,6 +70,23 @@ class BBThreadsafeForwardingResult(ThreadsafeForwardingResult):
             self.semaphore.release()
         super(BBThreadsafeForwardingResult, self)._add_result_with_semaphore(method, test, *args, **kwargs)
 
+#
+# We have to patch subunit since it doesn't understand how to handle addError
+# outside of a running test case. This can happen if classSetUp() fails
+# for a class of tests. This unfortunately has horrible internal knowledge.
+#
+def outSideTestaddError(self, offset, line):
+    """An 'error:' directive has been read."""
+    test_name = line[offset:-1].decode('utf8')
+    self.parser._current_test = subunit.RemotedTestCase(test_name)
+    self.parser.current_test_description = test_name
+    self.parser._state = self.parser._reading_error_details
+    self.parser._reading_error_details.set_simple()
+    self.parser.subunitLineReceived(line)
+
+subunit._OutSideTest.addError = outSideTestaddError
+
+
 #
 # A dummy structure to add to io.StringIO so that the .buffer object
 # is available and accepts writes. This allows unittest with buffer=True