feat: split out test files and execute them manually

This breaks the old grouping mechanism, but honestly that was a weird way of doing it.

tests/unit/repo.bats

@@ -0,0 +1,47 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+setup() {
+  global_setup
+  deploy_app
+}
+
+teardown() {
+  destroy_app
+  global_teardown
+}
+
+@test "(repo) repo:help" {
+  run /bin/bash -c "dokku repo"
+  echo "output: $output"
+  echo "status: $status"
+  assert_output_contains "Manage the app's repo"
+  help_output="$output"
+
+  run /bin/bash -c "dokku repo:help"
+  echo "output: $output"
+  echo "status: $status"
+  assert_output_contains "Manage the app's repo"
+  assert_output "$help_output"
+}
+
+@test "(repo) repo:gc, repo:purge-cache" {
+  run /bin/bash -c "dokku repo:gc $TEST_APP"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run /bin/bash -c "find $DOKKU_ROOT/$TEST_APP/cache -type f | wc -l | grep 0"
+  echo "output: $output"
+  echo "status: $status"
+  assert_failure
+  run /bin/bash -c "dokku repo:purge-cache $TEST_APP"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  run /bin/bash -c "find $DOKKU_ROOT/$TEST_APP/cache -type f | wc -l | grep 0"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+}