feat: add tests for src/node/app.ts

This adds a couple tests for ensureAddress.

src/node/app.ts

@@ -69,10 +69,10 @@ export const createApp = async (args: DefaultedArgs): Promise<[Express, Express,
 export const ensureAddress = (server: http.Server): string => {
   const addr = server.address()
   if (!addr) {
-    throw new Error("server has no address")
+    throw new Error("server has no address") // NOTE@jsjoeio test this line
   }
   if (typeof addr !== "string") {
     return `http://${addr.address}:${addr.port}`
   }
-  return addr
+  return addr // NOTE@jsjoeio test this line
 }

test/unit/node/app.test.ts

@@ -0,0 +1,30 @@
+import * as http from "http"
+import { ensureAddress } from "../../../src/node/app"
+import { getAvailablePort } from "../../utils/helpers"
+
+describe("ensureAddress", () => {
+  let mockServer: http.Server
+
+  beforeEach(() => {
+    mockServer = http.createServer()
+  })
+
+  afterEach(() => {
+    mockServer.close()
+  })
+
+  it("should throw and error if no address", () => {
+    expect(() => ensureAddress(mockServer)).toThrow("server has no address")
+  })
+  it("should return the address if it exists and not a string", async () => {
+    const port = await getAvailablePort()
+    mockServer.listen(port)
+    const address = ensureAddress(mockServer)
+    expect(address).toBe(`http://:::${port}`)
+  })
+  it("should return the address if it exists", async () => {
+    mockServer.address = () => "http://localhost:8080"
+    const address = ensureAddress(mockServer)
+    expect(address).toBe(`http://localhost:8080`)
+  })
+})