Handle replay args within replay module.

tools/telemetry/telemetry/core/webpagereplay_unittest.py

Index: tools/telemetry/telemetry/core/webpagereplay_unittest.py
diff --git a/tools/telemetry/telemetry/core/webpagereplay_unittest.py b/tools/telemetry/telemetry/core/webpagereplay_unittest.py
index 11303d51db39be0549a995876165df3443ffc11c..b48d5c2792f81a4a342a20962cf238b188a3c29f 100644
--- a/tools/telemetry/telemetry/core/webpagereplay_unittest.py
+++ b/tools/telemetry/telemetry/core/webpagereplay_unittest.py
@@ -2,12 +2,34 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import sys
 import unittest
 
 from telemetry.core import webpagereplay
 
 
 # pylint: disable=W0212
+class CommandLineTest(unittest.TestCase):
+  def testHasDnsGivesDnsPort(self):
+    expected_cmd_line = [
+        sys.executable, 'replay.py', '--extra_arg', '--host=127.0.0.1',
+        '--port=2', '--ssl_port=1', '--dns_port=0',
+        '--use_closest_match', '--log_level=warning', 'foo.wpr']
+    cmd_line = webpagereplay.ReplayServer._CommandLine(
+        'replay.py', ['--extra_arg'], 'foo.wpr', '127.0.0.1', 2, 1, 0)
+    self.assertEqual(expected_cmd_line, cmd_line)
+
+  def testNoDnsGivesNoDnsForwarding(self):
+    expected_cmd_line = [
+        sys.executable, 'replay.py', '--host=127.0.0.1',
+        '--port=8080', '--ssl_port=8443', '--no-dns_forwarding',
+        '--use_closest_match', '--log_level=warning', 'bar.wpr']
+    cmd_line = webpagereplay.ReplayServer._CommandLine(
+        'replay.py', [], 'bar.wpr', '127.0.0.1', 8080, 8443, None)
+    self.assertEqual(expected_cmd_line, cmd_line)
+
+
+# pylint: disable=W0212
 class ParseLogFilePortsTest(unittest.TestCase):
   def testEmptyLinesGivesEmptyDict(self):
     log_lines = iter([])