Adding cython v0.20.2 in third-party.

third_party/cython/src/Cython/Tests/TestCodeWriter.py

+from Cython.TestUtils import CythonTest
+
+class TestCodeWriter(CythonTest):
+    # CythonTest uses the CodeWriter heavily, so do some checking by
+    # roundtripping Cython code through the test framework.
+
+    # Note that this test is dependant upon the normal Cython parser
+    # to generate the input trees to the CodeWriter. This save *a lot*
+    # of time; better to spend that time writing other tests than perfecting
+    # this one...
+
+    # Whitespace is very significant in this process:
+    #  - always newline on new block (!)
+    #  - indent 4 spaces
+    #  - 1 space around every operator
+
+    def t(self, codestr):
+        self.assertCode(codestr, self.fragment(codestr).root)
+
+    def test_print(self):
+        self.t(u"""
+                    print x, y
+                    print x + y ** 2
+                    print x, y, z,
+               """)
+
+    def test_if(self):
+        self.t(u"if x:\n    pass")
+
+    def test_ifelifelse(self):
+        self.t(u"""
+                    if x:
+                        pass
+                    elif y:
+                        pass
+                    elif z + 34 ** 34 - 2:
+                        pass
+                    else:
+                        pass
+                """)
+
+    def test_def(self):
+        self.t(u"""
+                    def f(x, y, z):
+                        pass
+                    def f(x = 34, y = 54, z):
+                        pass
+               """)
+
+    def test_longness_and_signedness(self):
+        self.t(u"def f(unsigned long long long long long int y):\n    pass")
+
+    def test_signed_short(self):
+        self.t(u"def f(signed short int y):\n    pass")
+
+    def test_typed_args(self):
+        self.t(u"def f(int x, unsigned long int y):\n    pass")
+
+    def test_cdef_var(self):
+        self.t(u"""
+                    cdef int hello
+                    cdef int hello = 4, x = 3, y, z
+                """)
+
+    def test_for_loop(self):
+        self.t(u"""
+                    for x, y, z in f(g(h(34) * 2) + 23):
+                        print x, y, z
+                    else:
+                        print 43
+                """)
+
+    def test_inplace_assignment(self):
+        self.t(u"x += 43")
+
+    def test_attribute(self):
+        self.t(u"a.x")
+
+if __name__ == "__main__":
+    import unittest
+    unittest.main()
+