Added some new tests

migrations/20200212092056-create-colors.js

@@ -0,0 +1,26 @@
+module.exports = {
+  up: (queryInterface, Sequelize) => {
+    return queryInterface.createTable("Colors", {
+      id: {
+        allowNull: false,
+        autoIncrement: true,
+        primaryKey: true,
+        type: Sequelize.INTEGER
+      },
+      name: {
+        type: Sequelize.STRING
+      },
+      createdAt: {
+        allowNull: false,
+        type: Sequelize.DATE
+      },
+      updatedAt: {
+        allowNull: false,
+        type: Sequelize.DATE
+      }
+    });
+  },
+  down: queryInterface => {
+    return queryInterface.dropTable("Colors");
+  }
+};

migrations/20200212092136-create-cars-colors.js

@@ -0,0 +1,39 @@
+module.exports = {
+  up: (queryInterface, Sequelize) => {
+    return queryInterface.createTable("CarsColors", {
+      id: {
+        allowNull: false,
+        autoIncrement: true,
+        primaryKey: true,
+        type: Sequelize.INTEGER
+      },
+      CarId: {
+        type: Sequelize.INTEGER,
+        allowNull: true,
+        references: {
+          model: "Cars",
+          key: "id"
+        }
+      },
+      ColorId: {
+        type: Sequelize.INTEGER,
+        allowNull: true,
+        references: {
+          model: "Colors",
+          key: "id"
+        }
+      },
+      createdAt: {
+        allowNull: false,
+        type: Sequelize.DATE
+      },
+      updatedAt: {
+        allowNull: false,
+        type: Sequelize.DATE
+      }
+    });
+  },
+  down: queryInterface => {
+    return queryInterface.dropTable("CarsColors");
+  }
+};

migrations/20200212093136-setUniqueCarsColors.js

@@ -0,0 +1,15 @@
+module.exports = {
+  up: queryInterface => {
+    return queryInterface.addConstraint("CarsColors", ["CarId", "ColorId"], {
+      type: "unique",
+      name: "CarsColors_unique_carId_colorId"
+    });
+  },
+
+  down: queryInterface => {
+    return queryInterface.removeConstraint(
+      "CarsColors",
+      "CarsColors_unique_carId_colorId"
+    );
+  }
+};