Better test coverage

tests/test_client.py

@@ -0,0 +1,18 @@
+from sporestack.api_client import APIClient
+from sporestack.client import Client, Server, Token
+
+
+def test_client() -> None:
+    client = Client()
+    assert isinstance(client.api_client, APIClient)
+
+
+def test_server() -> None:
+    server = Server(machine_id="foobar")
+    assert isinstance(server.api_client, APIClient)
+
+
+def test_token() -> None:
+    token = Token()
+    assert token.token.startswith("ss_t_")
+    assert isinstance(token.api_client, APIClient)