the application was rewritten a bit to be more testable

api/core.py

@@ -0,0 +1,30 @@
+from flask import Flask, jsonify, Response, request
+from flask_sqlalchemy import SQLAlchemy
+from api.extensions.esales import Esales
+from api.helpers import check_api_key
+
+db = SQLAlchemy()
+esales = Esales()
+
+def create_app(config_name='config'):
+    app = Flask(__name__)
+    app.config.from_object(config_name)
+
+    db.init_app(app)
+    esales.init_app(app)
+
+    # register errors handlers
+    @app.errorhandler(404)
+    def on_404(e):
+        return jsonify(dict(error='Not found')), 404
+
+    # register blueprints
+    from api.views import server, designers, categories
+    app.register_blueprint(server.mod)
+    app.register_blueprint(designers.mod)
+    app.register_blueprint(categories.mod)
+
+    # authentication
+    app.before_request(check_api_key)
+
+    return app