1 files changed, 101 insertions, 0 deletions
diff --git a/tests/test_inherit.py b/tests/test_inherit.py
new file mode 100644
index 0000000..a276378
--- /dev/null
+++ b/tests/test_inherit.py
@@ -0,0 +1,101 @@
+"""
+    Tests for inheritance in RegexLexer
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    :copyright: Copyright 2006-2022 by the Pygments team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+from pygments.lexer import RegexLexer, inherit
+from pygments.token import Text
+
+
+class One(RegexLexer):
+    tokens = {
+        'root': [
+            ('a', Text),
+            ('b', Text),
+        ],
+    }
+
+
+class Two(One):
+    tokens = {
+        'root': [
+            ('x', Text),
+            inherit,
+            ('y', Text),
+        ],
+    }
+
+
+class Three(Two):
+    tokens = {
+        'root': [
+            ('i', Text),
+            inherit,
+            ('j', Text),
+        ],
+    }
+
+
+class Beginning(Two):
+    tokens = {
+        'root': [
+            inherit,
+            ('m', Text),
+        ],
+    }
+
+
+class End(Two):
+    tokens = {
+        'root': [
+            ('m', Text),
+            inherit,
+        ],
+    }
+
+
+class Empty(One):
+    tokens = {}
+
+
+class Skipped(Empty):
+    tokens = {
+        'root': [
+            ('x', Text),
+            inherit,
+            ('y', Text),
+        ],
+    }
+
+
+def test_single_inheritance_position():
+    t = Two()
+    pats = [x[0].__self__.pattern for x in t._tokens['root']]
+    assert ['x', 'a', 'b', 'y'] == pats
+
+
+def test_multi_inheritance_beginning():
+    t = Beginning()
+    pats = [x[0].__self__.pattern for x in t._tokens['root']]
+    assert ['x', 'a', 'b', 'y', 'm'] == pats
+
+
+def test_multi_inheritance_end():
+    t = End()
+    pats = [x[0].__self__.pattern for x in t._tokens['root']]
+    assert ['m', 'x', 'a', 'b', 'y'] == pats
+
+
+def test_multi_inheritance_position():
+    t = Three()
+    pats = [x[0].__self__.pattern for x in t._tokens['root']]
+    assert ['i', 'x', 'a', 'b', 'y', 'j'] == pats
+
+
+def test_single_inheritance_with_skip():
+    t = Skipped()
+    pats = [x[0].__self__.pattern for x in t._tokens['root']]
+    assert ['x', 'a', 'b', 'y'] == pats