test: ensure autocomplete output works

See #649

tests/integration/autocomplete.bats

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+
+setup_file(){
+  load "$PWD/tests/integration/helpers/common"
+  _common_setup
+}
+
+setup(){
+  load "$PWD/tests/integration/helpers/common"
+  _common_setup
+}
+
+@test "autocomplete output works" {
+  run $ABRA autocomplete bash
+  assert_success
+
+  run $ABRA autocomplete fish
+  assert_success
+
+  run $ABRA autocomplete zsh
+  assert_success
+
+  run $ABRA autocomplete powershell
+  assert_success
+}