Write tests output to stdout

This allows to watch test progress, in color.

Change-Id: I7ceebddae420d7d942f70a6b74ee0a3d11cf105e
Refs: bug #1187912

anvil/components/base_testing.py

@@ -14,7 +14,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import os
+import sys
 
 from anvil import cfg
 from anvil import colorizer
@@ -131,13 +131,11 @@ def run_tests(self):
             return
         cmd = self._get_test_command()
         env = self._get_env()
-        with open(os.devnull, 'wb') as null_fh:
-            if self.get_bool_option("verbose", default_value=False):
-                null_fh = None
-            try:
-                sh.execute(cmd, stdout_fh=None, stderr_fh=null_fh, cwd=app_dir, env_overrides=env)
-            except excp.ProcessExecutionError as e:
-                if self.get_bool_option("ignore-test-failures", default_value=False):
-                    LOG.warn("Ignoring test failure of component %s: %s", colorizer.quote(self.name), e)
-                else:
-                    raise e
+        try:
+            sh.execute(cmd, stdout_fh=sys.stdout, stderr_fh=sys.stdout,
+                       cwd=app_dir, env_overrides=env)
+        except excp.ProcessExecutionError as e:
+            if self.get_bool_option("ignore-test-failures", default_value=False):
+                LOG.warn("Ignoring test failure of component %s: %s", colorizer.quote(self.name), e)
+            else:
+                raise e