test(server): fixed unix socket helper close method

Author: knagaitsev

test/helpers/test-unix-socket.js

@@ -15,11 +15,15 @@ const TestUnixSocket = class TestUnixSocket {
   }
 
   close(done) {
-    // get rid of connected sockets
-    for (const socket of this.sockets.values()) {
-      socket.destroy();
+    if (this.server.listening) {
+      // get rid of connected sockets
+      for (const socket of this.sockets.values()) {
+        socket.destroy();
+      }
+      this.server.close(done);
+    } else {
+      done();
     }
-    this.server.close(done);
   }
 };
 

test/server/socket-option.test.js

@@ -95,7 +95,7 @@ describe('socket', () => {
       });
     });
 
-    it('should work as Unix socket', (done) => {
+    it('should throw already used error', (done) => {
       server = testServer.start(
         config,
         {

test/server/utils/startUnixSocket.test.js

@@ -87,7 +87,7 @@ describe('startUnixSocket', () => {
       });
     });
 
-    it('should work as Unix socket', (done) => {
+    it('should throw already used error', (done) => {
       testUnixSocket = new TestUnixSocket();
       startUnixSocket(
         testUnixSocket.server,