diff --git a/tests/test_loadextension.py b/tests/test_loadextension.py
new file mode 100644
index 00000000..c5b3fca4
--- /dev/null
+++ b/tests/test_loadextension.py
@@ -0,0 +1,28 @@
+from datasette.utils import LoadExtension
+
+def test_dos_path():
+    path_string = "C:\Windows\System32\mod_spatialite.dll"
+    le = LoadExtension()
+    path = le.convert(path_string, None, None)
+    assert path == "C:\Windows\System32\mod_spatialite.dll"
+    
+def test_dos_pathentry():
+    path_entry = "C:\Windows\System32\mod_spatialite.dll:testentry"
+    le = LoadExtension()
+    pathen, entry = le.convert(path_entry, None, None)
+    assert pathen == "C:\Windows\System32\mod_spatialite.dll"
+    assert entry == "testentry"
+    
+def test_linux_path():
+    path_string = "/base/test/test2"
+    le = LoadExtension()
+    path = le.convert(path_string, None, None)
+    assert path == path_string
+
+def test_linux_path_entry():
+    path_string = "/base/test/test2:testentry"
+    le = LoadExtension()
+    path, entry = le.convert(path_string, None, None)
+    assert path == "/base/test/test2"
+    assert entry == "testentry"
+    
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