Add test for anomalous-backslash-in-string.

Author: msuozzo

tests/functional/a/anomalous_backslash_escape.py

@@ -0,0 +1,21 @@
+# pylint:disable=W0105, W0511
+"""Test for anomalous backslash escapes in strings"""
+
+BAD_ESCAPE = '\z'  # [anomalous-backslash-in-string]
+BAD_ESCAPE_NOT_FIRST = 'abc\z'  # [anomalous-backslash-in-string]
+BAD_ESCAPE_WITH_PREFIX = b'abc\z'  # [anomalous-backslash-in-string]
+BAD_ESCAPE_WITH_BACKSLASH = b'a\
+    \z'  # [anomalous-backslash-in-string]
+# +3:[anomalous-backslash-in-string]
+BAD_ESCAPE_BLOCK = b'''
+    abc
+    \z
+'''
+BAD_ESCAPE_PARENS = (b'abc'
+                     b'\z')  # [anomalous-backslash-in-string]
+GOOD_ESCAPE = '\b'
+
+# Valid raw strings
+BAD_ESCAPE_BUT_RAW = r'\z'
+
+# In a comment you can have whatever you want: \z

tests/functional/a/anomalous_backslash_escape.txt

@@ -0,0 +1,6 @@
+anomalous-backslash-in-string:4::"Anomalous backslash in string: '\z'. String constant might be missing an r prefix."
+anomalous-backslash-in-string:5::"Anomalous backslash in string: '\z'. String constant might be missing an r prefix."
+anomalous-backslash-in-string:6::"Anomalous backslash in string: '\z'. String constant might be missing an r prefix."
+anomalous-backslash-in-string:8::"Anomalous backslash in string: '\z'. String constant might be missing an r prefix."
+anomalous-backslash-in-string:12::"Anomalous backslash in string: '\z'. String constant might be missing an r prefix."
+anomalous-backslash-in-string:15::"Anomalous backslash in string: '\z'. String constant might be missing an r prefix."