tests: add output/status and flesh out restart tests a bit more

tests/service_unlink.bats

@@ -53,7 +53,20 @@ teardown() {
 }
 
 @test "($PLUGIN_COMMAND_PREFIX:unlink) respects --no-restart" {
+  run dokku "$PLUGIN_COMMAND_PREFIX:unlink" ls my-app
+  echo "output: $output"
+  echo "status: $status"
+  assert_output_contains "Restarting app my-app" 1
+  assert_success
+
+  run dokku "$PLUGIN_COMMAND_PREFIX:link" ls my-app
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
   run dokku "$PLUGIN_COMMAND_PREFIX:unlink" ls my-app --no-restart
+  echo "output: $output"
+  echo "status: $status"
   assert_output_contains "Restarting app my-app" 0
   assert_success
 }