fix(portcheck): feedback from PR 266#discussion_r255314895

src/common/net.spec.ts

@@ -15,20 +15,20 @@ describe("Net", () => {
  describe("#isPortAvailable", () => {
  context("when the port is not allowed to be bound", () => {
  it("should return a rejected promise", () => {
- expect(isPortAvailable(specialPort, host)).to.eventually.be.rejected;
+ return expect(isPortAvailable(specialPort, host)).to.eventually.be.rejected;
  });
  });
 
  context("when the port is available", () => {
- it("should return a fulfilled promise", () => {
- expect(isPortAvailable(port + 1, host)).to.eventually.be.fulfilled;
+ it("should return a fulfilled promise",  () => {
+ return expect(isPortAvailable(port, host)).to.eventually.be.fulfilled;
  });
  });
 
  context("when the port is unavailable", () => {
  it("should return a rejected promise", () => {
  createServer(port).then((_: { close(): any }) => {
- expect(isPortAvailable(port, host)).to.eventually.be.rejected;
+ return expect(isPortAvailable(port, host)).to.eventually.be.rejected;
  });
  });
  });

src/common/net.ts

@@ -21,7 +21,7 @@ const portCheck = (port: number, host: string): Promise<void> => {
  .listen({ port, host, exclusive: true })
  .on("error", (e: any) => {
  if (e.code === "EADDRINUSE") {
- reject(new Error(`Port ${port} is unavailable`))
+ reject(new Error(`Port ${port} is unavailable on address ${host}`))
  } else {
  reject(e);
  }