diff --git a/tests/test_cmd.py b/tests/test_cmd.py
new file mode 100644
index 0000000..053364f
--- /dev/null
+++ b/tests/test_cmd.py
@@ -0,0 +1,10 @@
+from tornado.ioloop import IOLoop
+from tests.helper import ExternalVersionTestCase
+
+
+class CMDTest(ExternalVersionTestCase):
+    def get_new_ioloop(self):
+        return IOLoop.instance()
+
+    def test_cmd(self):
+        self.assertEqual(self.sync_get_version("example", {"cmd": "echo Meow"}), "Meow")
diff --git a/tests/test_cpan.py b/tests/test_cpan.py
new file mode 100644
index 0000000..d11f7a4
--- /dev/null
+++ b/tests/test_cpan.py
@@ -0,0 +1,6 @@
+from tests.helper import ExternalVersionTestCase
+
+
+class CPANTest(ExternalVersionTestCase):
+    def test_cpan(self):
+        self.assertEqual(self.sync_get_version("POE-Component-Server-HTTPServer", {"cpan": None}), "0.9.2")
diff --git a/tests/test_gems.py b/tests/test_gems.py
new file mode 100644
index 0000000..1ea2fa3
--- /dev/null
+++ b/tests/test_gems.py
@@ -0,0 +1,6 @@
+from tests.helper import ExternalVersionTestCase
+
+
+class RubyGemsTest(ExternalVersionTestCase):
+    def test_gems(self):
+        self.assertEqual(self.sync_get_version("example", {"gems": None}), "1.0.2")
diff --git a/tests/test_hackage.py b/tests/test_hackage.py
new file mode 100644
index 0000000..b754aae
--- /dev/null
+++ b/tests/test_hackage.py
@@ -0,0 +1,6 @@
+from tests.helper import ExternalVersionTestCase
+
+
+class HackageTest(ExternalVersionTestCase):
+    def test_hackage(self):
+        self.assertEqual(self.sync_get_version("sessions", {"hackage": None}), "2008.7.18")
diff --git a/tests/test_pypi.py b/tests/test_pypi.py
new file mode 100644
index 0000000..59a4fa5
--- /dev/null
+++ b/tests/test_pypi.py
@@ -0,0 +1,6 @@
+from tests.helper import ExternalVersionTestCase
+
+
+class PyPITest(ExternalVersionTestCase):
+    def test_pypi(self):
+        self.assertEqual(self.sync_get_version("example", {"pypi": None}), "0.1.0")