oeqa: Improve test failure messages

index 512cb4f..dd9f44e 100644
@@ -27,7 +27,7 @@ class SStateTests(SStateBase):
         if should_pass:
             self.assertTrue(file_tracker , msg="Could not find sstate files for: %s" % ', '.join(map(str, targets)))
         else:
-            self.assertTrue(not file_tracker , msg="Found sstate files in the wrong place for: %s" % ', '.join(map(str, targets)))
+            self.assertTrue(not file_tracker , msg="Found sstate files in the wrong place for: %s (found %s)" % (', '.join(map(str, targets)), str(file_tracker)))
 
     @testcase(975)
     def test_sstate_creation_distro_specific_pass(self):

@@ -56,14 +56,14 @@ class SStateTests(SStateBase):
 
         bitbake(targets)
         tgz_created = self.search_sstate('|'.join(map(str, [s + '.*?\.tgz$' for s in targets])), distro_specific, distro_nonspecific)
-        self.assertTrue(tgz_created, msg="Could not find sstate .tgz files for: %s" % ', '.join(map(str, targets)))
+        self.assertTrue(tgz_created, msg="Could not find sstate .tgz files for: %s (%s)" % (', '.join(map(str, targets)), str(tgz_created)))
 
         siginfo_created = self.search_sstate('|'.join(map(str, [s + '.*?\.siginfo$' for s in targets])), distro_specific, distro_nonspecific)
-        self.assertTrue(siginfo_created, msg="Could not find sstate .siginfo files for: %s" % ', '.join(map(str, targets)))
+        self.assertTrue(siginfo_created, msg="Could not find sstate .siginfo files for: %s (%s)" % (', '.join(map(str, targets)), str(siginfo_created)))
 
         bitbake(['-ccleansstate'] + targets)
         tgz_removed = self.search_sstate('|'.join(map(str, [s + '.*?\.tgz$' for s in targets])), distro_specific, distro_nonspecific)
-        self.assertTrue(not tgz_removed, msg="do_cleansstate didn't remove .tgz sstate files for: %s" % ', '.join(map(str, targets)))
+        self.assertTrue(not tgz_removed, msg="do_cleansstate didn't remove .tgz sstate files for: %s (%s)" % (', '.join(map(str, targets)), str(tgz_removed)))
 
     @testcase(977)
     def test_cleansstate_task_distro_specific_nonspecific(self):