MarkdownBear: Add test to check message for error

A better test for MarkdownBear to check the exact message
of the result for a maximum line length error.

Closes #1235

package.json

@@ -16,7 +16,7 @@
     "jshint": "~2",
     "postcss-cli": "~2",
     "remark-cli": "~2",
-    "remark-lint": ">=5.1.0",
+    "remark-lint": "~5.1.0",
     "tslint": "~3",
     "typescript": ">=1.7.3",
     "ramllint": "~1.2.2",

tests/markdown/MarkdownBearTest.py

@@ -1,5 +1,13 @@
+import unittest
+from queue import Queue
+
 from bears.markdown.MarkdownBear import MarkdownBear
-from coalib.testing.LocalBearTestHelper import verify_local_bear
+from coalib.testing.BearTestHelper import generate_skip_decorator
+from coalib.testing.LocalBearTestHelper import verify_local_bear, execute_bear
+from coalib.results.RESULT_SEVERITY import RESULT_SEVERITY
+from coalib.settings.Section import Section
+from coalib.settings.Setting import Setting
+from coala_utils.ContextManagers import prepare_file
 
 test_file1 = """1. abc
 1. def
@@ -29,3 +37,21 @@
     valid_files=(test_file2,),
     invalid_files=(test_file3,),
     settings={'max_line_length': 10})
+
+
+@generate_skip_decorator(MarkdownBear)
+class MarkdownBearMaxLineLengthMessageTest(unittest.TestCase):
+
+    def setUp(self):
+        self.section = Section('name')
+        self.uut = MarkdownBear(self.section, Queue())
+
+    def test_invalid_message(self):
+        content = test_file3.splitlines()
+        self.section.append(Setting('max_line_length', '10'))
+        with prepare_file(content, None) as (file, fname):
+            with execute_bear(self.uut, fname, file) as results:
+                self.assertEqual(results[0].message,
+                                 'Line must be at most 10 characters'
+                                 '  maximum-line-length  remark-lint')
+                self.assertEqual(results[0].severity, RESULT_SEVERITY.NORMAL)