add tests for repo commands

tests/unit/10_repo.bats

@@ -0,0 +1,31 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+setup() {
+  deploy_app
+}
+
+teardown() {
+  destroy_app
+}
+
+@test "(repo) repo:gc, repo:purge-cache" {
+  run dokku repo:gc $TEST_APP
+  echo "output: "$output
+  echo "status: "$status
+  assert_success
+
+  run bash -c "find $DOKKU_ROOT/$TEST_APP/cache -type f | wc -l | grep 0"
+  echo "output: "$output
+  echo "status: "$status
+  assert_failure
+  run dokku repo:purge-cache $TEST_APP
+  echo "output: "$output
+  echo "status: "$status
+  assert_success
+  run bash -c "find $DOKKU_ROOT/$TEST_APP/cache -type f | wc -l | grep 0"
+  echo "output: "$output
+  echo "status: "$status
+  assert_success
+}