Output any errors produced during test runs. (#167)

This CL captures the stderr of the amber process and fails the tests if
there were error messages reported. This should allow catching vulkan
validation errors.

Fixes #151

1 files changed, 6 insertions, 1 deletions

diff --git a/tests/run_tests.py b/tests/run_tests.py
index 24faab2..578f5fd 100755
--- a/tests/run_tests.py
+++ b/tests/run_tests.py
@@ -53,8 +53,13 @@ class TestRunner:
     cmd += [tc.GetInputPath()]
 
     try:
-      subprocess.check_output(cmd)
+      err = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
+      if err != "" and not tc.IsExpectedFail():
+        sys.stdout.write(err)
+        return False
+
     except Exception as e:
+      print e.output
       if not tc.IsExpectedFail():
         print e
       return False