Test add fixtures and integration setup

test/fixtures/models/city.js

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+export default (sequelize, DataTypes) => {
+  return sequelize.define('City', {
+    id: {
+      type: DataTypes.INTEGER,
+      primaryKey: true,
+      autoIncrement: true,
+    },
+    name: DataTypes.STRING,
+  }, {
+    classMethods: {
+      associate: (models) => {
+        models.City.hasMany(models.Team, {
+          foreignKey: { name: 'cityId' },
+        });
+      },
+    },
+  });
+};

test/fixtures/models/player.js

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+export default (sequelize, DataTypes) => {
+  return sequelize.define('Player', {
+    id: {
+      type: DataTypes.INTEGER,
+      primaryKey: true,
+      autoIncrement: true,
+    },
+    name: DataTypes.STRING,
+    teamId: DataTypes.INTEGER,
+  }, {
+    classMethods: {
+      associate: (models) => {
+        models.Player.belongsTo(models.Team, {
+          foreignKey: { name: 'teamId' },
+        });
+      },
+    },
+  });
+};

test/fixtures/models/team.js

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+export default (sequelize, DataTypes) => {
+  return sequelize.define('Team', {
+    id: {
+      type: DataTypes.INTEGER,
+      primaryKey: true,
+      autoIncrement: true,
+    },
+    name: DataTypes.STRING,
+    cityId: DataTypes.INTEGER,
+  }, {
+    classMethods: {
+      associate: (models) => {
+        models.Team.belongsTo(models.City, {
+          foreignKey: { name: 'cityId' },
+        });
+        models.Team.hasMany(models.Player, {
+          foreignKey: { name: 'teamId' },
+        });
+      },
+    },
+  });
+};