Add tests for limits.

test/test_limits.py

@@ -0,0 +1,43 @@
+#!/usr/bin/env python
+# coding: utf-8
+import pytest
+
+from msgpack import packb, unpackb
+
+
+def test_integer():
+    x = -(2 ** 63)
+    assert unpackb(packb(x)) == x
+    with pytest.raises(OverflowError):
+        packb(x-1)
+
+    x = 2 ** 64 - 1
+    assert unpackb(packb(x)) == x
+    with pytest.raises(OverflowError):
+        packb(x+1)
+
+@pytest.mark.skipif(True, "Requires very large memory.")
+def test_binary():
+    x = b'x' * (2**32 - 1)
+    assert unpackb(packb(x)) == x
+    x += b'y'
+    with pytest.raises(ValueError):
+        packb(x)
+
+
+@pytest.mark.skipif(True, "Requires very large memory.")
+def test_string():
+    x = u'x' * (2**32 - 1)
+    assert unpackb(packb(x)) == x
+    x += u'y'
+    with pytest.raises(ValueError):
+        packb(x)
+
+
+@pytest.mark.skipif(True, "Requires very large memory.")
+def test_array():
+    x = [0] * (2**32 - 1)
+    assert unpackb(packb(x)) == x
+    x.append(0)
+    with pytest.raises(ValueError):
+        packb(x)