tests: replace pycodestyle with black

Drop pycodestyle for code style checking in favor of black. Black is
much faster, stable PEP8 compliant code style checker offering also
automatic formatting. It aims to be very stable and produce smallest
diffs. It's used by many small and big projects.

Running checkstyle with black takes a few seconds with a terse output.
Thus, test-checkstyle-diff is no longer necessary.

Expand scope of checkstyle to all python files in the repo, replacing
test-checkstyle with checkstyle-python.

Also, fixstyle-python is now available for automatic style formatting.

Note: python virtualenv has been consolidated in test/Makefile,
test/requirements*.txt which will eventually be moved to a central
location.  This is required to simply the automated generation of
docker executor images in the CI.

Type: improvement
Change-Id: I022a326603485f58585e879ac0f697fceefbc9c8
Signed-off-by: Klement Sekera <klement.sekera@gmail.com>
Signed-off-by: Dave Wallace <dwallacelf@gmail.com>

1 files changed, 38 insertions, 35 deletions

diff --git a/test/test_offload.py b/test/test_offload.py
index ae5a5b3c6dc..d84f8ba63c0 100644
--- a/test/test_offload.py
+++ b/test/test_offload.py
@@ -7,7 +7,7 @@ from vpp_ip_route import VppIpTable, VppIpRoute, VppRoutePath
 
 
 class TestOffload(VppTestCase):
-    """ Offload Unit Test Cases """
+    """Offload Unit Test Cases"""
 
     @classmethod
     def setUpClass(cls):
@@ -24,52 +24,55 @@ class TestOffload(VppTestCase):
         super(TestOffload, self).tearDown()
 
     def test_offload_unittest(self):
-        """ Checksum Offload Test """
-        cmds = ["loop create",
-                "set int ip address loop0 11.22.33.1/24",
-                "set int state loop0 up",
-                "loop create",
-                "set int ip address loop1 11.22.34.1/24",
-                "set int state loop1 up",
-                "set ip neighbor loop1 11.22.34.44 03:00:11:22:34:44",
-                "packet-generator new {\n"
-                "  name s0\n"
-                "  limit 100\n"
-                "  size 128-128\n"
-                "  interface loop0\n"
-                "  tx-interface loop1\n"
-                "  node loop1-output\n"
-                "  buffer-flags ip4 offload\n"
-                "  buffer-offload-flags offload-ip-cksum offload-udp-cksum\n"
-                "  data {\n"
-                "    IP4: 1.2.3 -> dead.0000.0001\n"
-                "    UDP: 11.22.33.44 -> 11.22.34.44\n"
-                "      ttl 2 checksum 13\n"
-                "    UDP: 1234 -> 2345\n"
-                "      checksum 11\n"
-                "    incrementing 114\n"
-                "  }\n"
-                "}",
-                "trace add pg-input 1",
-                "pa en",
-                "show error"]
+        """Checksum Offload Test"""
+        cmds = [
+            "loop create",
+            "set int ip address loop0 11.22.33.1/24",
+            "set int state loop0 up",
+            "loop create",
+            "set int ip address loop1 11.22.34.1/24",
+            "set int state loop1 up",
+            "set ip neighbor loop1 11.22.34.44 03:00:11:22:34:44",
+            "packet-generator new {\n"
+            "  name s0\n"
+            "  limit 100\n"
+            "  size 128-128\n"
+            "  interface loop0\n"
+            "  tx-interface loop1\n"
+            "  node loop1-output\n"
+            "  buffer-flags ip4 offload\n"
+            "  buffer-offload-flags offload-ip-cksum offload-udp-cksum\n"
+            "  data {\n"
+            "    IP4: 1.2.3 -> dead.0000.0001\n"
+            "    UDP: 11.22.33.44 -> 11.22.34.44\n"
+            "      ttl 2 checksum 13\n"
+            "    UDP: 1234 -> 2345\n"
+            "      checksum 11\n"
+            "    incrementing 114\n"
+            "  }\n"
+            "}",
+            "trace add pg-input 1",
+            "pa en",
+            "show error",
+        ]
 
         for cmd in cmds:
             r = self.vapi.cli_return_response(cmd)
             if r.retval != 0:
-                if hasattr(r, 'reply'):
+                if hasattr(r, "reply"):
                     self.logger.info(cmd + " FAIL reply " + r.reply)
                 else:
                     self.logger.info(cmd + " FAIL retval " + str(r.retval))
 
         r = self.vapi.cli_return_response("show trace")
         self.assertTrue(r.retval == 0)
-        self.assertTrue(hasattr(r, 'reply'))
+        self.assertTrue(hasattr(r, "reply"))
         rv = r.reply
-        look_here = rv.find('ethernet-input')
+        look_here = rv.find("ethernet-input")
         self.assertFalse(look_here == -1)
-        bad_checksum_index = rv[look_here:].find('should be')
+        bad_checksum_index = rv[look_here:].find("should be")
         self.assertTrue(bad_checksum_index == -1)
 
-if __name__ == '__main__':
+
+if __name__ == "__main__":
     unittest.main(testRunner=VppTestRunner)