Test for excluding long <include>s from line lengths.

tests/presubmit_unittest.py

Index: tests/presubmit_unittest.py
diff --git a/tests/presubmit_unittest.py b/tests/presubmit_unittest.py
index 65c521c39aac8306a163ab2c6c6aa0420b684a23..ed38eff430b20f54c01780fbaf83b21cb90f3f9c 100755
--- a/tests/presubmit_unittest.py
+++ b/tests/presubmit_unittest.py
@@ -2263,6 +2263,15 @@ class CannedChecksUnittest(PresubmitTestsBase):
         'foo.cc',
         presubmit.OutputApi.PresubmitPromptWarning)
 
+  def testCannedCheckLongLinesGritInclude(self):
+    check = lambda x, y, z: presubmit_canned_checks.CheckLongLines(x, y, 10, z)
+    self.ContentTest(
+        check,
+        '<include src="file.js">',
+        'foo.js',
+        'var include = "this test is stupid";',
+        'bar.js',
+        presubmit.OutputApi.PresubmitPromptWarning)
 
   def testCannedCheckLongLinesLongSymbol(self):
     check = lambda x, y, z: presubmit_canned_checks.CheckLongLines(x, y, 10, z)