Added some new tests

models/cars.js

@@ -21,6 +21,7 @@ module.exports = (sequelize, DataTypes) => {
       as: "Brand",
       foreignKey: "brandId"
     });
+    Cars.belongsToMany(models.Colors, { through: models.CarsColors });
   };
 
   return Cars;

models/carscolors.js

@@ -0,0 +1,24 @@
+module.exports = (sequelize, DataTypes) => {
+  const CarsColors = sequelize.define(
+    "CarsColors",
+    {
+      CarId: {
+        type: DataTypes.INTEGER,
+        references: {
+          model: "Cars",
+          key: "id"
+        }
+      },
+      ColorId: {
+        type: DataTypes.INTEGER,
+        references: {
+          model: "Colors",
+          key: "id"
+        }
+      }
+    },
+    {}
+  );
+
+  return CarsColors;
+};

models/colors.js

@@ -0,0 +1,11 @@
+module.exports = (sequelize, DataTypes) => {
+  const Colors = sequelize.define(
+    "Colors",
+    {
+      name: DataTypes.STRING
+    },
+    {}
+  );
+
+  return Colors;
+};