Added tests of CSS.escape.

2 files changed, 11 insertions, 3 deletions

diff --git a/bs4/css.py b/bs4/css.py
index 5d60267..9b047f8 100644
--- a/bs4/css.py
+++ b/bs4/css.py
@@ -43,13 +43,14 @@ class CSS(object):
 
     @classmethod
     def escape(cls, ident):
-        """Escape a CSS selector.
+        """Escape a CSS identifier.
 
-        This is a simple wrapper around soupselect.escape().
+        This is a simple wrapper around soupselect.escape(). See the
+        documentation for that function for more information.
         """
         if soupsieve is None:
             raise NotImplementedError(
-                "Cannot escape CSS selectors because the soupsieve package is not installed."
+                "Cannot escape CSS identifiers because the soupsieve package is not installed."
             )
         return soupsieve.escape(ident)
         
diff --git a/bs4/tests/test_css.py b/bs4/tests/test_css.py
index 3da9aed..51662ed 100644
--- a/bs4/tests/test_css.py
+++ b/bs4/tests/test_css.py
@@ -2,6 +2,7 @@ import pytest
 import types
 
 from bs4 import (
+    CSS,
     BeautifulSoup,
     ResultSet,
 )
@@ -466,3 +467,9 @@ class TestCSSSelectors(SoupTest):
         assert isinstance(results, ResultSet)
         [result] = results
         assert result['id'] == 'header3'
+
+    def test_escape(self):
+        m = CSS.escape
+        assert m(".foo#bar") == '\\.foo\\#bar'
+        assert m("()[]{}") == '\\(\\)\\[\\]\\{\\}'
+        assert m(".foo") == self.soup.css.escape(".foo")