add lint check for newline at end of file

tools/lint/lib/checks/posix.py

@@ -0,0 +1,10 @@
+from ..check import Check
+import re
+
+class CheckPosix(Check):
+    '''Ensure tests are valid POSIX files'''
+    ID = 'POSIX'
+
+    def run(self, name, meta, source):
+        if not source.endswith('\n'):
+            return 'File must end with a newline'

tools/lint/lint.py

@@ -43,6 +43,7 @@ from lib.checks.negative import CheckNegative
 from lib.checks.filename import CheckFileName
 from lib.checks.nopadding import CheckNoPadding
 from lib.checks.flags import CheckFlags
+from lib.checks.posix import CheckPosix
 from lib.eprint import eprint
 import lib.frontmatter
 import lib.exceptions
@@ -67,6 +68,7 @@ checks = [
     CheckNegative(),
     CheckNoPadding(),
     CheckFlags(),
+    CheckPosix(),
 ]
 
 def lint(file_names):

tools/lint/test/run.py

@@ -39,7 +39,7 @@ class TestLinter(unittest.TestCase):
 
     def test_exceptions_single(self):
         test_content = ('// Copyright (C) 2017 Mike Pennisi. All rights reserved.\n' +
-            '// This code is governed by the BSD license found in the LICENSE file.')
+            '// This code is governed by the BSD license found in the LICENSE file.\n')
         test_file = self.fixture('input.js', test_content)
         exceptions_content = test_file + ' FRONTMATTER'
         exceptions_file = self.fixture('lint.exceptions', exceptions_content)
@@ -54,7 +54,7 @@ class TestLinter(unittest.TestCase):
 
     def test_exceptions_comment(self):
         test_content = ('// Copyright (C) 2017 Mike Pennisi. All rights reserved.\n' +
-            '// This code is governed by the BSD license found in the LICENSE file.')
+            '// This code is governed by the BSD license found in the LICENSE file.\n')
         test_file = self.fixture('input.js', test_content)
         exceptions_content = ('# One comment\n' +
             '# Another comment\n' +