Add tests for every implemented command

tests/service_unexpose.bats

@@ -0,0 +1,28 @@
+#!/usr/bin/env bats
+load test_helper
+
+setup() {
+  dokku "$PLUGIN_COMMAND_PREFIX:create" l >&2
+}
+
+teardown() {
+  dokku --force "$PLUGIN_COMMAND_PREFIX:destroy" l >&2
+}
+
+@test "($PLUGIN_COMMAND_PREFIX:unexpose) error when there are no arguments" {
+  run dokku "$PLUGIN_COMMAND_PREFIX:unexpose"
+  assert_contains "${lines[*]}" "Please specify a name for the service"
+}
+
+@test "($PLUGIN_COMMAND_PREFIX:unexpose) error when service does not exist" {
+  run dokku "$PLUGIN_COMMAND_PREFIX:unexpose" not_existing_service
+  assert_contains "${lines[*]}" "service not_existing_service does not exist"
+}
+
+@test "($PLUGIN_COMMAND_PREFIX:unexpose) success" {
+  dokku "$PLUGIN_COMMAND_PREFIX:expose" l
+  run dokku "$PLUGIN_COMMAND_PREFIX:unexpose" l
+  [[ ! -f $PLUGIN_DATA_ROOT/PORT ]]
+  assert_contains "${lines[*]}" "Service l unexposed"
+}
+