Adds LineItemService (#11)

packages/medusa/src/services/__tests__/line-item.js

@@ -0,0 +1,49 @@
+import mongoose from "mongoose"
+import { IdMap } from "medusa-test-utils"
+import LineItemService from "../line-item"
+import { ProductVariantServiceMock } from "../__mocks__/product-variant"
+import { ProductServiceMock } from "../__mocks__/product"
+import { RegionServiceMock } from "../__mocks__/region"
+
+describe("LineItemService", () => {
+  describe("generate", () => {
+    let result
+    beforeAll(async () => {
+      jest.clearAllMocks()
+      const lineItemService = new LineItemService({
+        productVariantService: ProductVariantServiceMock,
+        productService: ProductServiceMock,
+        regionService: RegionServiceMock,
+      })
+      result = await lineItemService.generate(
+        IdMap.getId("eur-10-us-12"),
+        IdMap.getId("region-france"),
+        2
+      )
+    })
+
+    it("generates line item and successfully defaults quantity of content to 1", () => {
+      expect(result).toEqual({
+        content: {
+          unit_price: 10,
+          variant: {
+            _id: IdMap.getId("eur-10-us-12"),
+          },
+          product: {
+            _id: "1234",
+            title: "test",
+          },
+          quantity: 1,
+        },
+        product: {
+          _id: "1234",
+          title: "test",
+        },
+        variant: {
+          _id: IdMap.getId("eur-10-us-12"),
+        },
+        quantity: 2,
+      })
+    })
+  })
+})