Update gin_integration_test.go (#2341)

* Update gin_integration_test.go

TestUnixSocket fails if you run it twice in a row.  This is due to the unix socket file persisting.  Added defer to clean up.

Whats unclear is the following test TestBadUnixSocket I suspect is just looking for cruft maybe from a prior test or defaults not working, I have not enough background to say.

* Update gin_integration_test.go

I believe there is some tab issue here, tried to manual overwrite it now.

* Update gin_integration_test.go

squash you dang spaces!!!

gin_integration_test.go

@@ -146,15 +146,19 @@ func TestRunWithPort(t *testing.T) {
 func TestUnixSocket(t *testing.T) {
 	router := New()
 
+	unixTestSocket := "/tmp/unix_unit_test"
+
+	defer os.Remove(unixTestSocket)
+
 	go func() {
 		router.GET("/example", func(c *Context) { c.String(http.StatusOK, "it worked") })
-		assert.NoError(t, router.RunUnix("/tmp/unix_unit_test"))
+		assert.NoError(t, router.RunUnix(unixTestSocket))
 	}()
 	// have to wait for the goroutine to start and run the server
 	// otherwise the main thread will complete
 	time.Sleep(5 * time.Millisecond)
 
-	c, err := net.Dial("unix", "/tmp/unix_unit_test")
+	c, err := net.Dial("unix", unixTestSocket)
 	assert.NoError(t, err)
 
 	fmt.Fprint(c, "GET /example HTTP/1.0\r\n\r\n")