diff --git a/tests/test_lib_domain_middlware.py b/tests/test_lib_domain_middlware.py
new file mode 100644
index 0000000..d4994b1
--- /dev/null
+++ b/tests/test_lib_domain_middlware.py
@@ -0,0 +1,37 @@
+from starlette.testclient import TestClient
+from starlette.middleware.base import BaseHTTPMiddleware
+from unittest.mock import patch
+from halfapi.lib.domain_middleware import DomainMiddleware
+
+def test_init():
+    with patch('starlette.middleware.base.BaseHTTPMiddleware.__init__') as init:
+        mw = DomainMiddleware('app', 'domain')
+        init.assert_called_once_with('app')
+        assert mw.domain == 'domain'
+        assert mw.request == None
+
+def test_call(application_debug):
+    c = TestClient(application_debug)
+    r = c.get('/abc/alphabet')
+    assert r.status_code == 200
+    assert r.headers['x-domain'] == 'dummy_domain'
+    assert r.headers['x-acl'] == 'public'
+
+    r = c.get('/arguments')
+    assert r.status_code == 400
+    assert r.headers['x-domain'] == 'dummy_domain'
+    assert r.headers['x-acl'] == 'public'
+    assert 'foo' in r.headers['x-args-required']
+    assert 'bar' in r.headers['x-args-required']
+    assert r.headers['x-args-optional'] == 'x'
+
+    c = TestClient(application_debug)
+    r = c.post('/arguments')
+    assert r.status_code == 400
+    assert r.headers['x-domain'] == 'dummy_domain'
+    assert r.headers['x-acl'] == 'public'
+    assert 'foo' in r.headers['x-args-required']
+    assert 'baz' in r.headers['x-args-required']
+    assert r.headers['x-args-optional'] == 'truebidoo'
+
+