contrib/python-zstandard/tests/test_buffer_util.py

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/contrib/python-zstandard/tests/test_buffer_util.py	Sat Apr 01 15:24:03 2017 -0700
@@ -0,0 +1,112 @@
+import struct
+
+try:
+    import unittest2 as unittest
+except ImportError:
+    import unittest
+
+import zstd
+
+ss = struct.Struct('=QQ')
+
+
+class TestBufferWithSegments(unittest.TestCase):
+    def test_arguments(self):
+        with self.assertRaises(TypeError):
+            zstd.BufferWithSegments()
+
+        with self.assertRaises(TypeError):
+            zstd.BufferWithSegments(b'foo')
+
+        # Segments data should be a multiple of 16.
+        with self.assertRaisesRegexp(ValueError, 'segments array size is not a multiple of 16'):
+            zstd.BufferWithSegments(b'foo', b'\x00\x00')
+
+    def test_invalid_offset(self):
+        with self.assertRaisesRegexp(ValueError, 'offset within segments array references memory'):
+            zstd.BufferWithSegments(b'foo', ss.pack(0, 4))
+
+    def test_invalid_getitem(self):
+        b = zstd.BufferWithSegments(b'foo', ss.pack(0, 3))
+
+        with self.assertRaisesRegexp(IndexError, 'offset must be non-negative'):
+            test = b[-10]
+
+        with self.assertRaisesRegexp(IndexError, 'offset must be less than 1'):
+            test = b[1]
+
+        with self.assertRaisesRegexp(IndexError, 'offset must be less than 1'):
+            test = b[2]
+
+    def test_single(self):
+        b = zstd.BufferWithSegments(b'foo', ss.pack(0, 3))
+        self.assertEqual(len(b), 1)
+        self.assertEqual(b.size, 3)
+        self.assertEqual(b.tobytes(), b'foo')
+
+        self.assertEqual(len(b[0]), 3)
+        self.assertEqual(b[0].offset, 0)
+        self.assertEqual(b[0].tobytes(), b'foo')
+
+    def test_multiple(self):
+        b = zstd.BufferWithSegments(b'foofooxfooxy', b''.join([ss.pack(0, 3),
+                                                               ss.pack(3, 4),
+                                                               ss.pack(7, 5)]))
+        self.assertEqual(len(b), 3)
+        self.assertEqual(b.size, 12)
+        self.assertEqual(b.tobytes(), b'foofooxfooxy')
+
+        self.assertEqual(b[0].tobytes(), b'foo')
+        self.assertEqual(b[1].tobytes(), b'foox')
+        self.assertEqual(b[2].tobytes(), b'fooxy')
+
+
+class TestBufferWithSegmentsCollection(unittest.TestCase):
+    def test_empty_constructor(self):
+        with self.assertRaisesRegexp(ValueError, 'must pass at least 1 argument'):
+            zstd.BufferWithSegmentsCollection()
+
+    def test_argument_validation(self):
+        with self.assertRaisesRegexp(TypeError, 'arguments must be BufferWithSegments'):
+            zstd.BufferWithSegmentsCollection(None)
+
+        with self.assertRaisesRegexp(TypeError, 'arguments must be BufferWithSegments'):
+            zstd.BufferWithSegmentsCollection(zstd.BufferWithSegments(b'foo', ss.pack(0, 3)),
+                                              None)
+
+        with self.assertRaisesRegexp(ValueError, 'ZstdBufferWithSegments cannot be empty'):
+            zstd.BufferWithSegmentsCollection(zstd.BufferWithSegments(b'', b''))
+
+    def test_length(self):
+        b1 = zstd.BufferWithSegments(b'foo', ss.pack(0, 3))
+        b2 = zstd.BufferWithSegments(b'barbaz', b''.join([ss.pack(0, 3),
+                                                          ss.pack(3, 3)]))
+
+        c = zstd.BufferWithSegmentsCollection(b1)
+        self.assertEqual(len(c), 1)
+        self.assertEqual(c.size(), 3)
+
+        c = zstd.BufferWithSegmentsCollection(b2)
+        self.assertEqual(len(c), 2)
+        self.assertEqual(c.size(), 6)
+
+        c = zstd.BufferWithSegmentsCollection(b1, b2)
+        self.assertEqual(len(c), 3)
+        self.assertEqual(c.size(), 9)
+
+    def test_getitem(self):
+        b1 = zstd.BufferWithSegments(b'foo', ss.pack(0, 3))
+        b2 = zstd.BufferWithSegments(b'barbaz', b''.join([ss.pack(0, 3),
+                                                          ss.pack(3, 3)]))
+
+        c = zstd.BufferWithSegmentsCollection(b1, b2)
+
+        with self.assertRaisesRegexp(IndexError, 'offset must be less than 3'):
+            c[3]
+
+        with self.assertRaisesRegexp(IndexError, 'offset must be less than 3'):
+            c[4]
+
+        self.assertEqual(c[0].tobytes(), b'foo')
+        self.assertEqual(c[1].tobytes(), b'bar')
+        self.assertEqual(c[2].tobytes(), b'baz')