Issue #26712: Unify (r)split, (l/r)strip tests into string_tests

This eliminates a few redundant test cases.

Lib/test/string_tests.py

@@ -368,6 +368,8 @@ class BaseTest:
                         sys.maxsize-2)
         self.checkequal(['a|b|c|d'], 'a|b|c|d', 'split', '|', 0)
         self.checkequal(['a', '', 'b||c||d'], 'a||b||c||d', 'split', '|', 2)
+        self.checkequal(['abcd'], 'abcd', 'split', '|')
+        self.checkequal([''], '', 'split', '|')
         self.checkequal(['endcase ', ''], 'endcase |', 'split', '|')
         self.checkequal(['', ' startcase'], '| startcase', 'split', '|')
         self.checkequal(['', 'bothcase', ''], '|bothcase|', 'split', '|')
@@ -435,6 +437,8 @@ class BaseTest:
                         sys.maxsize-100)
         self.checkequal(['a|b|c|d'], 'a|b|c|d', 'rsplit', '|', 0)
         self.checkequal(['a||b||c', '', 'd'], 'a||b||c||d', 'rsplit', '|', 2)
+        self.checkequal(['abcd'], 'abcd', 'rsplit', '|')
+        self.checkequal([''], '', 'rsplit', '|')
         self.checkequal(['', ' begincase'], '| begincase', 'rsplit', '|')
         self.checkequal(['endcase ', ''], 'endcase |', 'rsplit', '|')
         self.checkequal(['', 'bothcase', ''], '|bothcase|', 'rsplit', '|')
@@ -714,16 +718,21 @@ class BaseTest:
         self.checkequal(['a'], '  a    ', 'split')
         self.checkequal(['a', 'b'], '  a    b   ', 'split')
         self.checkequal(['a', 'b   '], '  a    b   ', 'split', None, 1)
+        self.checkequal(['a    b   c   '], '  a    b   c   ', 'split', None, 0)
         self.checkequal(['a', 'b   c   '], '  a    b   c   ', 'split', None, 1)
         self.checkequal(['a', 'b', 'c   '], '  a    b   c   ', 'split', None, 2)
+        self.checkequal(['a', 'b', 'c'], '  a    b   c   ', 'split', None, 3)
         self.checkequal(['a', 'b'], '\n\ta \t\r b \v ', 'split')
         aaa = ' a '*20
         self.checkequal(['a']*20, aaa, 'split')
         self.checkequal(['a'] + [aaa[4:]], aaa, 'split', None, 1)
         self.checkequal(['a']*19 + ['a '], aaa, 'split', None, 19)
 
-        # mixed use of str and unicode
+        for b in ('arf\tbarf', 'arf\nbarf', 'arf\rbarf',
-        self.checkequal(['a', 'b', 'c d'], 'a b c d', 'split', ' ', 2)
+                  'arf\fbarf', 'arf\vbarf'):
+            self.checkequal(['arf', 'barf'], b, 'split')
+            self.checkequal(['arf', 'barf'], b, 'split', None)
+            self.checkequal(['arf', 'barf'], b, 'split', None, 2)
 
     def test_additional_rsplit(self):
         self.checkequal(['this', 'is', 'the', 'rsplit', 'function'],
@@ -745,36 +754,53 @@ class BaseTest:
         self.checkequal(['a'], '  a    ', 'rsplit')
         self.checkequal(['a', 'b'], '  a    b   ', 'rsplit')
         self.checkequal(['  a', 'b'], '  a    b   ', 'rsplit', None, 1)
+        self.checkequal(['  a    b   c'], '  a    b   c   ', 'rsplit',
+                        None, 0)
         self.checkequal(['  a    b','c'], '  a    b   c   ', 'rsplit',
                         None, 1)
         self.checkequal(['  a', 'b', 'c'], '  a    b   c   ', 'rsplit',
                         None, 2)
+        self.checkequal(['a', 'b', 'c'], '  a    b   c   ', 'rsplit',
+                        None, 3)
         self.checkequal(['a', 'b'], '\n\ta \t\r b \v ', 'rsplit', None, 88)
         aaa = ' a '*20
         self.checkequal(['a']*20, aaa, 'rsplit')
         self.checkequal([aaa[:-4]] + ['a'], aaa, 'rsplit', None, 1)
         self.checkequal([' a  a'] + ['a']*18, aaa, 'rsplit', None, 18)
 
-        # mixed use of str and unicode
+        for b in ('arf\tbarf', 'arf\nbarf', 'arf\rbarf',
-        self.checkequal(['a b', 'c', 'd'], 'a b c d', 'rsplit', ' ', 2)
+                  'arf\fbarf', 'arf\vbarf'):
+            self.checkequal(['arf', 'barf'], b, 'rsplit')
+            self.checkequal(['arf', 'barf'], b, 'rsplit', None)
+            self.checkequal(['arf', 'barf'], b, 'rsplit', None, 2)
 
-    def test_strip(self):
+    def test_strip_whitespace(self):
         self.checkequal('hello', '   hello   ', 'strip')
         self.checkequal('hello   ', '   hello   ', 'lstrip')
         self.checkequal('   hello', '   hello   ', 'rstrip')
         self.checkequal('hello', 'hello', 'strip')
 
+        b = ' \t\n\r\f\vabc \t\n\r\f\v'
+        self.checkequal('abc', b, 'strip')
+        self.checkequal('abc \t\n\r\f\v', b, 'lstrip')
+        self.checkequal(' \t\n\r\f\vabc', b, 'rstrip')
+
         # strip/lstrip/rstrip with None arg
         self.checkequal('hello', '   hello   ', 'strip', None)
         self.checkequal('hello   ', '   hello   ', 'lstrip', None)
         self.checkequal('   hello', '   hello   ', 'rstrip', None)
         self.checkequal('hello', 'hello', 'strip', None)
 
+    def test_strip(self):
         # strip/lstrip/rstrip with str arg
         self.checkequal('hello', 'xyzzyhelloxyzzy', 'strip', 'xyz')
         self.checkequal('helloxyzzy', 'xyzzyhelloxyzzy', 'lstrip', 'xyz')
         self.checkequal('xyzzyhello', 'xyzzyhelloxyzzy', 'rstrip', 'xyz')
         self.checkequal('hello', 'hello', 'strip', 'xyz')
+        self.checkequal('', 'mississippi', 'strip', 'mississippi')
+
+        # only trim the start and end; does not strip internal characters
+        self.checkequal('mississipp', 'mississippi', 'strip', 'i')
 
         self.checkraises(TypeError, 'hello', 'strip', 42, 42)
         self.checkraises(TypeError, 'hello', 'lstrip', 42, 42)

Lib/test/test_bytes.py

@@ -495,68 +495,16 @@ class BaseBytesTest:
         self.assertEqual(b.replace(b'i', b'a'), b'massassappa')
         self.assertEqual(b.replace(b'ss', b'x'), b'mixixippi')
 
-    def test_split(self):
-        b = self.type2test(b'mississippi')
-        self.assertEqual(b.split(b'i'), [b'm', b'ss', b'ss', b'pp', b''])
-        self.assertEqual(b.split(b'ss'), [b'mi', b'i', b'ippi'])
-        self.assertEqual(b.split(b'w'), [b])
-        # with keyword args
-        b = self.type2test(b'a|b|c|d')
-        self.assertEqual(b.split(sep=b'|'), [b'a', b'b', b'c', b'd'])
-        self.assertEqual(b.split(b'|', maxsplit=1), [b'a', b'b|c|d'])
-        self.assertEqual(b.split(sep=b'|', maxsplit=1), [b'a', b'b|c|d'])
-        self.assertEqual(b.split(maxsplit=1, sep=b'|'), [b'a', b'b|c|d'])
-        b = self.type2test(b'a b c d')
-        self.assertEqual(b.split(maxsplit=1), [b'a', b'b c d'])
-
-    def test_split_whitespace(self):
-        for b in (b'  arf  barf  ', b'arf\tbarf', b'arf\nbarf', b'arf\rbarf',
-                  b'arf\fbarf', b'arf\vbarf'):
-            b = self.type2test(b)
-            self.assertEqual(b.split(), [b'arf', b'barf'])
-            self.assertEqual(b.split(None), [b'arf', b'barf'])
-            self.assertEqual(b.split(None, 2), [b'arf', b'barf'])
-        for b in (b'a\x1Cb', b'a\x1Db', b'a\x1Eb', b'a\x1Fb'):
-            b = self.type2test(b)
-            self.assertEqual(b.split(), [b])
-        self.assertEqual(self.type2test(b'  a  bb  c  ').split(None, 0), [b'a  bb  c  '])
-        self.assertEqual(self.type2test(b'  a  bb  c  ').split(None, 1), [b'a', b'bb  c  '])
-        self.assertEqual(self.type2test(b'  a  bb  c  ').split(None, 2), [b'a', b'bb', b'c  '])
-        self.assertEqual(self.type2test(b'  a  bb  c  ').split(None, 3), [b'a', b'bb', b'c'])
-
     def test_split_string_error(self):
         self.assertRaises(TypeError, self.type2test(b'a b').split, ' ')
 
     def test_split_unicodewhitespace(self):
+        for b in (b'a\x1Cb', b'a\x1Db', b'a\x1Eb', b'a\x1Fb'):
+            b = self.type2test(b)
+            self.assertEqual(b.split(), [b])
         b = self.type2test(b"\x09\x0A\x0B\x0C\x0D\x1C\x1D\x1E\x1F")
         self.assertEqual(b.split(), [b'\x1c\x1d\x1e\x1f'])
 
-    def test_rsplit(self):
-        b = self.type2test(b'mississippi')
-        self.assertEqual(b.rsplit(b'i'), [b'm', b'ss', b'ss', b'pp', b''])
-        self.assertEqual(b.rsplit(b'ss'), [b'mi', b'i', b'ippi'])
-        self.assertEqual(b.rsplit(b'w'), [b])
-        # with keyword args
-        b = self.type2test(b'a|b|c|d')
-        self.assertEqual(b.rsplit(sep=b'|'), [b'a', b'b', b'c', b'd'])
-        self.assertEqual(b.rsplit(b'|', maxsplit=1), [b'a|b|c', b'd'])
-        self.assertEqual(b.rsplit(sep=b'|', maxsplit=1), [b'a|b|c', b'd'])
-        self.assertEqual(b.rsplit(maxsplit=1, sep=b'|'), [b'a|b|c', b'd'])
-        b = self.type2test(b'a b c d')
-        self.assertEqual(b.rsplit(maxsplit=1), [b'a b c', b'd'])
-
-    def test_rsplit_whitespace(self):
-        for b in (b'  arf  barf  ', b'arf\tbarf', b'arf\nbarf', b'arf\rbarf',
-                  b'arf\fbarf', b'arf\vbarf'):
-            b = self.type2test(b)
-            self.assertEqual(b.rsplit(), [b'arf', b'barf'])
-            self.assertEqual(b.rsplit(None), [b'arf', b'barf'])
-            self.assertEqual(b.rsplit(None, 2), [b'arf', b'barf'])
-        self.assertEqual(self.type2test(b'  a  bb  c  ').rsplit(None, 0), [b'  a  bb  c'])
-        self.assertEqual(self.type2test(b'  a  bb  c  ').rsplit(None, 1), [b'  a  bb', b'c'])
-        self.assertEqual(self.type2test(b'  a  bb  c  ').rsplit(None, 2), [b'  a', b'bb', b'c'])
-        self.assertEqual(self.type2test(b'  a  bb  c  ').rsplit(None, 3), [b'a', b'bb', b'c'])
-
     def test_rsplit_string_error(self):
         self.assertRaises(TypeError, self.type2test(b'a b').rsplit, ' ')
 
@@ -601,37 +549,6 @@ class BaseBytesTest:
                 it = pickle.loads(d)
                 self.assertEqual(list(it), data[1:])
 
-    def test_strip(self):
-        b = self.type2test(b'mississippi')
-        self.assertEqual(b.strip(b'i'), b'mississipp')
-        self.assertEqual(b.strip(b'm'), b'ississippi')
-        self.assertEqual(b.strip(b'pi'), b'mississ')
-        self.assertEqual(b.strip(b'im'), b'ssissipp')
-        self.assertEqual(b.strip(b'pim'), b'ssiss')
-        self.assertEqual(b.strip(b), b'')
-
-    def test_lstrip(self):
-        b = self.type2test(b'mississippi')
-        self.assertEqual(b.lstrip(b'i'), b'mississippi')
-        self.assertEqual(b.lstrip(b'm'), b'ississippi')
-        self.assertEqual(b.lstrip(b'pi'), b'mississippi')
-        self.assertEqual(b.lstrip(b'im'), b'ssissippi')
-        self.assertEqual(b.lstrip(b'pim'), b'ssissippi')
-
-    def test_rstrip(self):
-        b = self.type2test(b'mississippi')
-        self.assertEqual(b.rstrip(b'i'), b'mississipp')
-        self.assertEqual(b.rstrip(b'm'), b'mississippi')
-        self.assertEqual(b.rstrip(b'pi'), b'mississ')
-        self.assertEqual(b.rstrip(b'im'), b'mississipp')
-        self.assertEqual(b.rstrip(b'pim'), b'mississ')
-
-    def test_strip_whitespace(self):
-        b = self.type2test(b' \t\n\r\f\vabc \t\n\r\f\v')
-        self.assertEqual(b.strip(), b'abc')
-        self.assertEqual(b.lstrip(), b'abc \t\n\r\f\v')
-        self.assertEqual(b.rstrip(), b' \t\n\r\f\vabc')
-
     def test_strip_bytearray(self):
         self.assertEqual(self.type2test(b'abc').strip(memoryview(b'ac')), b'b')
         self.assertEqual(self.type2test(b'abc').lstrip(memoryview(b'ac')), b'bc')
@@ -1470,7 +1387,7 @@ class AssortedBytesTest(unittest.TestCase):
     # XXX More string methods?  (Those that don't use character properties)
 
     # There are tests in string_tests.py that are more
-    # comprehensive for things like split, partition, etc.
+    # comprehensive for things like partition, etc.
     # Unfortunately they are all bundled with tests that
     # are not appropriate for bytes
 

Lib/test/test_unicode.py

@@ -380,10 +380,6 @@ class UnicodeTest(string_tests.CommonTest,
     def test_split(self):
         string_tests.CommonTest.test_split(self)
 
-        # Mixed arguments
-        self.checkequalnofix(['a', 'b', 'c', 'd'], 'a//b//c//d', 'split', '//')
-        self.checkequalnofix(['a', 'b', 'c', 'd'], 'a//b//c//d', 'split', '//')
-        self.checkequalnofix(['endcase ', ''], 'endcase test', 'split', 'test')
         # test mixed kinds
         for left, right in ('ba', '\u0101\u0100', '\U00010301\U00010300'):
             left *= 9