Remove <if> statements before checking JS code by checker.py

third_party/closure_compiler/checker_test.py

 #!/usr/bin/env python
 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import unittest
 from checker import FileCache, Flattener, LineNumber
 
 
 class NodeTest(unittest.TestCase):
@@ skipping 50 matching lines @@
     self.assertLineNumber(1, LineNumber("/checked.js", 1))
     self.assertLineNumber(5, LineNumber("/checked.js", 5))
     self.assertLineNumber(6, LineNumber("/global.js", 1))
     self.assertLineNumber(7, LineNumber("/debug.js", 1))
     self.assertLineNumber(8, LineNumber("/debug.js", 2))
     self.assertLineNumber(9, LineNumber("/global.js", 3))
     self.assertLineNumber(10, LineNumber("/checked.js", 7))
     self.assertLineNumber(11, LineNumber("/checked.js", 8))
 
 
+class IfStrippingTest(unittest.TestCase):
+  def __init__(self, *args, **kwargs):
+    unittest.TestCase.__init__(self, *args, **kwargs)
+    self.maxDiff = None
+
+  def setUp(self):
+    FileCache._cache["/century.js"] = """
+  function getCurrentCentury() {
+<if expr="netscape_os">
+    alert("Oh wow!");
+    return "XX";
+</if>
+    return "XXI";
+  }
+""".strip()
+
+    self.flattener_ = Flattener("/century.js")
+
+  def testIfStripping(self):
+    self.assertMultiLineEqual("""
+  function getCurrentCentury() {
+
+    alert("Oh wow!");
+    return "XX";
+
+    return "XXI";
+  }
+""".strip(), self.flattener_.contents)
+
+
 if __name__ == '__main__':
   unittest.main()