Fix single quotation detection in file mode

CHANGELOG.md

@@ -4,6 +4,8 @@ All notable changes in **salt-lint** are documented below.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Fixed
+- Ensure a single missing quote in the file mode is also detected as incorrect quotation of a file mode ([#273](https://github.com/warpnet/salt-lint/pull/273)).
 
 ## [0.7.0] (2021-11-01)
 ### Added

saltlint/rules/FileModeQuotationRule.py

@@ -17,7 +17,25 @@ class FileModeQuotationRule(Rule):
     tags = ['formatting']
     version_added = 'v0.0.3'
 
-    regex = re.compile(r"^\s+- ((dir_)|(file_))?mode: [0-9]{3,4}")
+    regex = re.compile(
+        r"""^\s+
+        -\                   # whitespace escaped due to re.VERBOSE
+        (?:dir_|file_)?mode  # file_mode, dir_mode or mode
+        :\                   # whitespace escaped duo to re.VERBOSE
+        (?:
+            (\d{3,4})        # mode without quotation
+          |
+            (['"]\d{3,4}     # mode prefixed with quotation
+              (?:
+                  $          # end of line
+                |            # or
+                  [^\d'"]    # ending quotation missing
+              )
+            )
+        )
+        """,
+        re.VERBOSE
+    )
 
     def match(self, file, line):
         return self.regex.search(line)

tests/unit/TestFileModeQuotationRule.py

@@ -30,6 +30,18 @@
     - dir_mode: 0775
 '''
 
+MODE_MISSING_QUOTATION_LINE = '''
+testfile:
+  file.managed:
+    - name: /tmp/badfile
+    - user: root
+    - group: root
+    - mode: "0700
+    - file_mode: '0660
+    - dir_mode: 0775"
+'''
+
+
 class TestModeQuotationRule(unittest.TestCase):
     collection = RulesCollection()
 
@@ -44,3 +56,7 @@ def test_statement_positive(self):
     def test_statement_negative(self):
         results = self.runner.run_state(BAD_MODE_QUOTATION_LINE)
         self.assertEqual(3, len(results))
+
+    def test_missing_quotes(self):
+        results = self.runner.run_state(MODE_MISSING_QUOTATION_LINE)
+        self.assertEqual(3, len(results))