Refactor IdMap test helper to medusa-test-utils package

packages/medusa-test-utils/.babelrc

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+{
+  "plugins": ["@babel/plugin-proposal-class-properties"],
+  "presets": ["@babel/preset-env"],
+  "env": {
+    "test": {
+      "plugins": ["@babel/plugin-transform-runtime"]
+    }
+  }
+}

packages/medusa-test-utils/.gitignore

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+dist/
+node_modules/

packages/medusa-test-utils/package.json

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+{
+  "name": "medusa-test-utils",
+  "version": "1.0.0",
+  "description": "Test utils for Medusa",
+  "main": "dist/index.js",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/srindom/medusa",
+    "directory": "packages/medusa-test-utils"
+  },
+  "scripts": {
+    "build": "babel src --out-dir dist/ --ignore **/__tests__",
+    "prepare": "cross-env NODE_ENV=production npm run build",
+    "watch": "babel -w src --out-dir dist/ --ignore **/__tests__"
+  },
+  "author": "Sebastian Rindom",
+  "license": "AGPL-3.0-or-later",
+  "devDependencies": {
+    "@babel/cli": "^7.7.5",
+    "@babel/core": "^7.7.5",
+    "@babel/plugin-proposal-class-properties": "^7.7.4",
+    "@babel/plugin-transform-runtime": "^7.7.6",
+    "@babel/preset-env": "^7.7.5",
+    "cross-env": "^5.2.1"
+  },
+  "dependencies": {
+    "mongoose": "^5.8.0"
+  }
+}

packages/medusa-test-utils/src/id-map.js

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+import mongoose from "mongoose"
+
+class IdMap {
+  ids = {}
+
+  getId(key) {
+    if (this.ids[key]) {
+      return this.ids[key]
+    }
+    const id = `${mongoose.Types.ObjectId()}`
+    this.ids[key] = id
+    return id
+  }
+}
+
+const instance = new IdMap()
+export default instance

packages/medusa-test-utils/src/index.js

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+export { default as IdMap } from "./id-map"