1 files changed, 18 insertions, 1 deletions
diff --git a/tests/test_basic_api.py b/tests/test_basic_api.py
index 7485df1a..84dd49bb 100644
--- a/tests/test_basic_api.py
+++ b/tests/test_basic_api.py
@@ -12,7 +12,7 @@ from __future__ import print_function
 import random
 import unittest
 
-from pygments import lexers, formatters, filters, format
+from pygments import lexers, formatters, lex, format
 from pygments.token import _TokenType, Text
 from pygments.lexer import RegexLexer
 from pygments.formatters.img import FontNotFound
@@ -254,6 +254,23 @@ def test_styles():
     HtmlFormatter(style="pastie")
 
 
+def test_bare_class_handler():
+    from pygments.formatters import HtmlFormatter
+    from pygments.lexers import PythonLexer
+    try:
+        lex('test\n', PythonLexer)
+    except TypeError as e:
+        assert 'lex() argument must be a lexer instance' in str(e)
+    else:
+        assert False, 'nothing raised'
+    try:
+        format([], HtmlFormatter)
+    except TypeError as e:
+        assert 'format() argument must be a formatter instance' in str(e)
+    else:
+        assert False, 'nothing raised'
+
+
 class FiltersTest(unittest.TestCase):
 
     def test_basic(self):