Adding cython v0.20.2 in third-party.

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

Index: third_party/cython/src/Cython/Tests/TestStringIOTree.py
diff --git a/third_party/cython/src/Cython/Tests/TestStringIOTree.py b/third_party/cython/src/Cython/Tests/TestStringIOTree.py
new file mode 100644
index 0000000000000000000000000000000000000000..09c04a514146a846efbe79d4f68bcb164cb620be
--- /dev/null
+++ b/third_party/cython/src/Cython/Tests/TestStringIOTree.py
@@ -0,0 +1,67 @@
+import unittest
+
+from Cython import StringIOTree as stringtree
+
+code = """
+cdef int spam                   # line 1
+
+cdef ham():
+    a = 1
+    b = 2
+    c = 3
+    d = 4
+
+def eggs():
+    pass
+
+cpdef bacon():
+    print spam
+    print 'scotch'
+    print 'tea?'
+    print 'or coffee?'          # line 16
+"""
+
+linemap = dict(enumerate(code.splitlines()))
+
+class TestStringIOTree(unittest.TestCase):
+
+    def setUp(self):
+        self.tree = stringtree.StringIOTree()
+
+    def test_markers(self):
+        assert not self.tree.allmarkers()
+
+    def test_insertion(self):
+        self.write_lines((1, 2, 3))
+        line_4_to_6_insertion_point = self.tree.insertion_point()
+        self.write_lines((7, 8))
+        line_9_to_13_insertion_point = self.tree.insertion_point()
+        self.write_lines((14, 15, 16))
+
+        line_4_insertion_point = line_4_to_6_insertion_point.insertion_point()
+        self.write_lines((5, 6), tree=line_4_to_6_insertion_point)
+
+        line_9_to_12_insertion_point = (
+            line_9_to_13_insertion_point.insertion_point())
+        self.write_line(13, tree=line_9_to_13_insertion_point)
+
+        self.write_line(4, tree=line_4_insertion_point)
+        self.write_line(9, tree=line_9_to_12_insertion_point)
+        line_10_insertion_point = line_9_to_12_insertion_point.insertion_point()
+        self.write_line(11, tree=line_9_to_12_insertion_point)
+        self.write_line(10, tree=line_10_insertion_point)
+        self.write_line(12, tree=line_9_to_12_insertion_point)
+
+        self.assertEqual(self.tree.allmarkers(), range(1, 17))
+        self.assertEqual(code.strip(), self.tree.getvalue().strip())
+
+
+    def write_lines(self, linenos, tree=None):
+        for lineno in linenos:
+            self.write_line(lineno, tree=tree)
+
+    def write_line(self, lineno, tree=None):
+        if tree is None:
+            tree = self.tree
+        tree.markers.append(lineno)
+        tree.write(linemap[lineno] + '\n')