diff --git a/tests/integration/test_config.py b/tests/integration/test_config.py
index 6dcfe40..11f1bed 100644
--- a/tests/integration/test_config.py
+++ b/tests/integration/test_config.py
@@ -1,3 +1,4 @@
+import os
 import json
 import urllib2
 import vcr
@@ -12,3 +13,20 @@ def test_set_serializer_default_config(tmpdir):
     with open(str(tmpdir.join('test.json'))) as f:
         assert json.loads(f.read())
 
+def test_default_set_cassette_library_dir(tmpdir):
+    my_vcr = vcr.VCR(cassette_library_dir=str(tmpdir.join('subdir')))
+
+    with my_vcr.use_cassette('test.json'):
+        urllib2.urlopen('http://httpbin.org/get')
+
+    assert os.path.exists(str(tmpdir.join('subdir').join('test.json')))
+
+def test_override_set_cassette_library_dir(tmpdir):
+    my_vcr = vcr.VCR(cassette_library_dir=str(tmpdir.join('subdir')))
+
+    with my_vcr.use_cassette('test.json', cassette_library_dir=str(tmpdir.join('subdir2'))):
+        urllib2.urlopen('http://httpbin.org/get')
+
+    assert os.path.exists(str(tmpdir.join('subdir2').join('test.json')))
+    assert not os.path.exists(str(tmpdir.join('subdir').join('test.json')))
+
diff --git a/vcr/config.py b/vcr/config.py
index 88ac41f..4c70d2d 100644
--- a/vcr/config.py
+++ b/vcr/config.py
@@ -1,3 +1,4 @@
+import os
 from .cassette import Cassette
 from .serializers.yamlserializer import YamlSerializer
 from .serializers.jsonserializer import JSONSerializer