Change port and move to constants

src/spec-kemal.cr

@@ -1,19 +1,23 @@
 require "spec"
 require "kemal"
 
-Kemal.config.env = "test"
+TIME_TO_SLEEP = 0.00001
+APP_PORT = 1989
+APP_ENV = "test"
+
+Kemal.config.env = APP_ENV
+Kemal.config.port = APP_PORT
 
 Spec.before_each do
   spawn do
     Kemal.run
     Kemal.config.server.listen
   end
-  sleep 0.00001
+  sleep TIME_TO_SLEEP
 end
 
 Spec.after_each do
   spawn do
-    Kemal.run
-    Kemal.config.server.listen
+    Kemal.config.server.close
   end
 end