tests: add cli_return_response to vpp_papi_provider

To improve gcov/lcov code coverage stats, it's necessary to send
incorrect debug CLI commands; to force vpp into debug CLI error paths.

cli_return_response() sends commands and returns the response object,
so test vectors can handle failures.

Type: feature

Signed-off-by: Dave Barach <dave@barachs.net>
Change-Id: I4fab591c9d2e30c996f016e18e4fd69b9c5bed06
(cherry picked from commit 5932ce17e128c096fcc56eb04b27e780da3cf255)

src/plugins/mactime/test/test_mactime.py

@@ -149,7 +149,12 @@ class TestMactime(VppTestCase):
                 "show error"]
 
         for cmd in cmds:
-            self.logger.info(self.vapi.cli(cmd))
+            r = self.vapi.cli_return_response(cmd)
+            if r.retval != 0:
+                if hasattr(r, 'reply'):
+                    self.logger.info(cmd + " FAIL reply " + r.reply)
+                else:
+                    self.logger.info(cmd + " FAIL retval " + str(r.retval))
 
 if __name__ == '__main__':
     unittest.main(testRunner=VppTestRunner)

test/vpp_papi_provider.py

@@ -338,6 +338,20 @@ class VppPapiProvider(object):
         self.hook.after_api(api_fn.__name__, api_args)
         return reply
 
+    def cli_return_response(self, cli):
+        """ Execute a CLI, calling the before/after hooks appropriately.
+        Return the reply without examining it
+
+        :param cli: CLI to execute
+        :returns: response object
+
+        """
+        self.hook.before_cli(cli)
+        cli += '\n'
+        r = self.papi.cli_inband(cmd=cli)
+        self.hook.after_cli(cli)
+        return r
+
     def cli(self, cli):
         """ Execute a CLI, calling the before/after hooks appropriately.
 
@@ -345,10 +359,7 @@ class VppPapiProvider(object):
         :returns: CLI output
 
         """
-        self.hook.before_cli(cli)
-        cli += '\n'
-        r = self.papi.cli_inband(cmd=cli)
-        self.hook.after_cli(cli)
+        r = self.cli_return_response(cli)
         if r.retval == -156:
             raise CliSyntaxError(r.reply)
         if r.retval != 0: