Extract auth code to own file, add some tests

tests/test_auth.py

@@ -0,0 +1,57 @@
+# -*- coding: utf-8 -*-
+
+from toot import App, User, api, config, auth
+from tests.utils import retval
+
+
+def test_register_app(monkeypatch):
+    app_data = {'id': 100, 'client_id': 'cid', 'client_secret': 'cs'}
+
+    def assert_app(app):
+        assert isinstance(app, App)
+        assert app.instance == "foo.bar"
+        assert app.base_url == "https://foo.bar"
+        assert app.client_id == "cid"
+        assert app.client_secret == "cs"
+
+    monkeypatch.setattr(api, 'create_app', retval(app_data))
+    monkeypatch.setattr(config, 'save_app', assert_app)
+
+    app = auth.register_app("foo.bar")
+    assert_app(app)
+
+
+def test_create_app_from_config(monkeypatch):
+    """When there is saved config, it's returned"""
+    monkeypatch.setattr(config, 'load_app', retval("loaded app"))
+    app = auth.create_app_interactive("bezdomni.net")
+    assert app == 'loaded app'
+
+
+def test_create_app_registered(monkeypatch):
+    """When there is no saved config, a new app is registered"""
+    monkeypatch.setattr(config, 'load_app', retval(None))
+    monkeypatch.setattr(auth, 'register_app', retval("registered app"))
+
+    app = auth.create_app_interactive("bezdomni.net")
+    assert app == 'registered app'
+
+
+def test_create_user(monkeypatch):
+    app = App(4, 5, 6, 7)
+
+    def assert_user(user):
+        assert isinstance(user, User)
+        assert user.instance == app.instance
+        assert user.username == 2
+        assert user.access_token == 3
+
+    monkeypatch.setattr(config, 'save_user', assert_user)
+
+    user = auth.create_user(app, 2, 3)
+
+    assert_user(user)
+
+#
+# TODO: figure out how to mock input so the rest can be tested
+#