feat: introduce dioc into hoppscotch-common

packages/dioc/test/test-container.spec.ts

@@ -0,0 +1,92 @@
+import { describe, expect, it, vi } from "vitest"
+import { TestContainer } from "../lib/testing"
+import { Service } from "../lib/service"
+import { ContainerEvent } from "../lib/container"
+
+class TestServiceA extends Service {
+  public static ID = "TestServiceA"
+
+  public test() {
+    return "real"
+  }
+}
+
+class TestServiceB extends Service {
+  public static ID = "TestServiceB"
+
+  // declared public to help with testing
+  public readonly serviceA = this.bind(TestServiceA)
+
+  public test() {
+    return this.serviceA.test()
+  }
+}
+
+describe("TestContainer", () => {
+  describe("bindMock", () => {
+    it("returns the fake service defined", () => {
+      const container = new TestContainer()
+
+      const fakeService = {
+        test: () => "fake",
+      }
+
+      const result = container.bindMock(TestServiceA, fakeService)
+
+      expect(result).toBe(fakeService)
+    })
+
+    it("new services bound to the container get the mock service", () => {
+      const container = new TestContainer()
+
+      const fakeServiceA = {
+        test: () => "fake",
+      }
+
+      container.bindMock(TestServiceA, fakeServiceA)
+
+      const serviceB = container.bind(TestServiceB)
+
+      expect(serviceB.serviceA).toBe(fakeServiceA)
+    })
+
+    it("container emits SERVICE_BIND event", () => {
+      const container = new TestContainer()
+
+      const fakeServiceA = {
+        test: () => "fake",
+      }
+
+      const serviceFunc = vi.fn<[ContainerEvent, void]>()
+
+      container.getEventStream().subscribe((ev) => {
+        serviceFunc(ev)
+      })
+
+      container.bindMock(TestServiceA, fakeServiceA)
+
+      expect(serviceFunc).toHaveBeenCalledOnce()
+      expect(serviceFunc).toHaveBeenCalledWith(<ContainerEvent>{
+        type: "SERVICE_BIND",
+        boundeeID: TestServiceA.ID,
+        bounderID: undefined,
+      })
+    })
+
+    it("throws if service already bound", () => {
+      const container = new TestContainer()
+
+      const fakeServiceA = {
+        test: () => "fake",
+      }
+
+      container.bindMock(TestServiceA, fakeServiceA)
+
+      expect(() => {
+        container.bindMock(TestServiceA, fakeServiceA)
+      }).toThrowError(
+        "Service 'TestServiceA' already bound to container. Did you already call bindMock on this ?"
+      )
+    })
+  })
+})