add integration test

tests/integration/app_cmd.bats

@@ -25,6 +25,24 @@ teardown(){
   fi
 }
 
+# bats test_tags=slow
+@test "autocomplete" {
+  run $ABRA app cmd --generate-bash-completion
+  assert_success
+  assert_output "$TEST_APP_DOMAIN"
+
+  run $ABRA app cmd "$TEST_APP_DOMAIN" --generate-bash-completion
+  assert_success
+  assert_output "app"
+
+  run $ABRA app cmd "$TEST_APP_DOMAIN" app --generate-bash-completion
+  assert_success
+  assert_output "test_cmd
+test_cmd_arg
+test_cmd_args
+test_cmd_export"
+}
+
 @test "validate app argument" {
   run $ABRA app cmd
   assert_failure