Add the first test

It just checks if the index page has a specific sentence.  But at least it’s now possible to
create tests.

tests/test_calsocial.py

@@ -0,0 +1,24 @@
+import pytest
+
+import calsocial
+from calsocial.models import db
+
+
+@pytest.fixture
+def client():
+    calsocial.app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///'
+    calsocial.app.config['TESTING'] = True
+    client = calsocial.app.test_client()
+
+    with calsocial.app.app_context():
+        db.create_all()
+
+    yield client
+
+
+def test_index_no_login(client):
+    """Test the main page without logging in
+    """
+
+    page = client.get('/')
+    assert b'Welcome to Calendar.social' in page.data