diff --git a/tests/test_argument.py b/tests/test_argument.py
index ae5ae62..3a959b6 100644
--- a/tests/test_argument.py
+++ b/tests/test_argument.py
@@ -41,16 +41,11 @@ class TestArgument(TreeEqualityTestCase):
     def test_strip(self):
         """test Argument.__strip__()"""
         node = Argument(wrap([Text("foobar")]))
-        self.assertIs(None, node.__strip__(True, True))
-        self.assertIs(None, node.__strip__(True, False))
-        self.assertIs(None, node.__strip__(False, True))
-        self.assertIs(None, node.__strip__(False, False))
-
         node2 = Argument(wrap([Text("foo")]), wrap([Text("bar")]))
-        self.assertEqual("bar", node2.__strip__(True, True))
-        self.assertEqual("bar", node2.__strip__(True, False))
-        self.assertEqual("bar", node2.__strip__(False, True))
-        self.assertEqual("bar", node2.__strip__(False, False))
+        for a in (True, False):
+            for b in (True, False):
+                self.assertIs(None, node.__strip__(a, b))
+                self.assertEqual("bar", node2.__strip__(a, b))
 
     def test_showtree(self):
         """test Argument.__showtree__()"""
diff --git a/tests/test_comment.py b/tests/test_comment.py
index 980f594..a7a3c4d 100644
--- a/tests/test_comment.py
+++ b/tests/test_comment.py
@@ -39,10 +39,9 @@ class TestComment(TreeEqualityTestCase):
     def test_strip(self):
         """test Comment.__strip__()"""
         node = Comment("foobar")
-        self.assertIs(None, node.__strip__(True, True))
-        self.assertIs(None, node.__strip__(True, False))
-        self.assertIs(None, node.__strip__(False, True))
-        self.assertIs(None, node.__strip__(False, False))
+        for a in (True, False):
+            for b in (True, False):
+                self.assertIs(None, node.__strip__(a, b))
 
     def test_showtree(self):
         """test Comment.__showtree__()"""
diff --git a/tests/test_heading.py b/tests/test_heading.py
index 88603a8..79b0ebf 100644
--- a/tests/test_heading.py
+++ b/tests/test_heading.py
@@ -41,10 +41,9 @@ class TestHeading(TreeEqualityTestCase):
     def test_strip(self):
         """test Heading.__strip__()"""
         node = Heading(wrap([Text("foobar")]), 3)
-        self.assertEqual("foobar", node.__strip__(True, True))
-        self.assertEqual("foobar", node.__strip__(True, False))
-        self.assertEqual("foobar", node.__strip__(False, True))
-        self.assertEqual("foobar", node.__strip__(False, False))
+        for a in (True, False):
+            for b in (True, False):
+                self.assertEqual("foobar", node.__strip__(a, b))
 
     def test_showtree(self):
         """test Heading.__showtree__()"""
diff --git a/tests/test_html_entity.py b/tests/test_html_entity.py
index b6b4394..d3d23bf 100644
--- a/tests/test_html_entity.py
+++ b/tests/test_html_entity.py
@@ -47,19 +47,13 @@ class TestHTMLEntity(TreeEqualityTestCase):
         node1 = HTMLEntity("nbsp", named=True, hexadecimal=False)
         node2 = HTMLEntity("107", named=False, hexadecimal=False)
         node3 = HTMLEntity("e9", named=False, hexadecimal=True)
-
-        self.assertEqual("\xa0", node1.__strip__(True, True))
-        self.assertEqual("\xa0", node1.__strip__(True, False))
-        self.assertEqual(" ", node1.__strip__(False, True))
-        self.assertEqual(" ", node1.__strip__(False, False))
-        self.assertEqual("k", node2.__strip__(True, True))
-        self.assertEqual("k", node2.__strip__(True, False))
-        self.assertEqual("k", node2.__strip__(False, True))
-        self.assertEqual("k", node2.__strip__(False, False))
-        self.assertEqual("é", node3.__strip__(True, True))
-        self.assertEqual("é", node3.__strip__(True, False))
-        self.assertEqual("é", node3.__strip__(False, True))
-        self.assertEqual("é", node3.__strip__(False, False))
+        for a in (True, False):
+            self.assertEqual("\xa0", node1.__strip__(True, a))
+            self.assertEqual(" ", node1.__strip__(False, a))
+            self.assertEqual("k", node2.__strip__(True, a))
+            self.assertEqual("k", node2.__strip__(False, a))
+            self.assertEqual("é", node3.__strip__(True, a))
+            self.assertEqual("é", node3.__strip__(False, a))
 
     def test_showtree(self):
         """test HTMLEntity.__showtree__()"""
diff --git a/tests/test_text.py b/tests/test_text.py
index 13636bf..f3649dd 100644
--- a/tests/test_text.py
+++ b/tests/test_text.py
@@ -39,10 +39,9 @@ class TestText(unittest.TestCase):
     def test_strip(self):
         """test Text.__strip__()"""
         node = Text("foobar")
-        self.assertIs(node, node.__strip__(True, True))
-        self.assertIs(node, node.__strip__(True, False))
-        self.assertIs(node, node.__strip__(False, True))
-        self.assertIs(node, node.__strip__(False, False))
+        for a in (True, False):
+            for b in (True, False):
+                self.assertIs(node, node.__strip__(a, b))
 
     def test_showtree(self):
         """test Text.__showtree__()"""
diff --git a/tests/test_wikilink.py b/tests/test_wikilink.py
index 7c02744..09ca5b3 100644
--- a/tests/test_wikilink.py
+++ b/tests/test_wikilink.py
@@ -41,16 +41,11 @@ class TestWikilink(TreeEqualityTestCase):
     def test_strip(self):
         """test Wikilink.__strip__()"""
         node = Wikilink(wrap([Text("foobar")]))
-        self.assertEqual("foobar", node.__strip__(True, True))
-        self.assertEqual("foobar", node.__strip__(True, False))
-        self.assertEqual("foobar", node.__strip__(False, True))
-        self.assertEqual("foobar", node.__strip__(False, False))
-
         node2 = Wikilink(wrap([Text("foo")]), wrap([Text("bar")]))
-        self.assertEqual("bar", node2.__strip__(True, True))
-        self.assertEqual("bar", node2.__strip__(True, False))
-        self.assertEqual("bar", node2.__strip__(False, True))
-        self.assertEqual("bar", node2.__strip__(False, False))
+        for a in (True, False):
+            for b in (True, False):
+                self.assertEqual("foobar", node.__strip__(a, b))
+                self.assertEqual("bar", node2.__strip__(a, b))
 
     def test_showtree(self):
         """test Wikilink.__showtree__()"""