fix: cannot catch EADDRINUSE (#198)

related to #184

Author: mpetrunic

.gitignore

@@ -4,3 +4,4 @@ coverage
 .nyc_output
 docs
 dist
+.coverage

package.json

@@ -168,7 +168,7 @@
     "@multiformats/multiaddr-to-uri": "^9.0.2",
     "abortable-iterator": "^4.0.2",
     "err-code": "^3.0.1",
-    "it-ws": "^5.0.0",
+    "it-ws": "^5.0.6",
     "p-defer": "^4.0.0",
     "p-timeout": "^6.0.0",
     "wherearewe": "^2.0.1"

test/node.ts

@@ -2,6 +2,7 @@
 /* eslint max-nested-callbacks: ["error", 6] */
 
 import https from 'https'
+import http from 'http'
 import fs from 'fs'
 import { expect } from 'aegir/chai'
 import { multiaddr } from '@multiformats/multiaddr'
@@ -102,6 +103,14 @@ describe('listen', () => {
       void listener.listen(ma)
     })
 
+    it('should error on starting two listeners on same address', async () => {
+      listener = ws.createListener({ upgrader })
+      const dumbServer = http.createServer()
+      await new Promise<void>(resolve => dumbServer.listen(ma.toOptions().port, resolve))
+      await expect(listener.listen(ma)).to.eventually.rejectedWith('listen EADDRINUSE')
+      await new Promise<void>(resolve => dumbServer.close(() => resolve()))
+    })
+
     it('listen, check for the close event', (done) => {
       const listener = ws.createListener({ upgrader })