Added test cases

Author: Franziska Geiger

graalpython/com.oracle.graal.python.test/src/tests/test_re.py

@@ -442,3 +442,16 @@ def test_escaping(self):
 
     def test_escape(self):
         self.assertEqual(re.escape(" ()"), "\\ \\(\\)")
+
+def test_none_value():
+    path_tokenizer = re.compile(
+        r"(//?| ==?)|([[]]+)"
+    ).findall
+
+    stream = iter([ (special,text)
+                    for (special,text) in path_tokenizer('[]')
+                    if special or text ])
+
+    n = next(stream)
+    assert not n[0]
+

graalpython/com.oracle.graal.python.test/src/tests/test_string.py

@@ -1096,3 +1096,34 @@ def test_strip_with_sep():
     assertRaises(TypeError, 'hello', 'strip', 42, 42)
     assertRaises(TypeError, 'hello', 'lstrip', 42, 42)
     assertRaises(TypeError, 'hello', 'rstrip', 42, 42)
+
+class EncodedString(str):
+    # unicode string subclass to keep track of the original encoding.
+    # 'encoding' is None for unicode strings and the source encoding
+    # otherwise
+    encoding = None
+
+    def __deepcopy__(self, memo):
+        return self
+
+    def byteencode(self):
+        assert self.encoding is not None
+        return self.encode(self.encoding)
+
+    def utf8encode(self):
+        assert self.encoding is None
+        return self.encode("UTF-8")
+
+    @property
+    def is_unicode(self):
+        return self.encoding is None
+
+    def contains_surrogates(self):
+        return string_contains_surrogates(self)
+
+    def as_utf8_string(self):
+        return bytes_literal(self.utf8encode(), 'utf8')
+
+def test_radd():
+    val = EncodedString('abc')
+    assert 'cde' + val == 'cdeabc'