tests: add a test case to cover new functionality

tests/unit/nginx-vhosts_11.bats

@@ -149,3 +149,67 @@ teardown() {
   echo "status: $status"
   assert_output_contains "proxy_busy_buffers_size 10k;" 0
 }
+
+
+@test "(nginx-vhosts) nginx:set nginx.conf.sigil" {
+  local TMP=$(mktemp -d "/tmp/dokku.me.XXXXX")
+  trap 'popd &>/dev/null || true; rm -rf "$TMP"' INT TERM
+  export CUSTOM_TMP="$TMP"
+
+  run deploy_app python
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output_contains "Overriding default nginx.conf with detected nginx.conf.sigil" 0
+
+  pushd $TMP
+  custom_nginx_template "$TEST_APP" "$CUSTOM_TMP"
+
+  run /bin/bash -c "git add nginx.conf.sigil"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run /bin/bash -c "git commit -m 'Add custom nginx.conf.sigil'"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run /bin/bash -c "git push target master:master"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output_contains "Overriding default nginx.conf with detected nginx.conf.sigil"
+
+  mv "$CUSTOM_TMP/nginx.conf.sigil" "$CUSTOM_TMP/nginx.conf.sigil-2"
+
+  run /bin/bash -c "git add nginx.conf.sigil nginx.conf.sigil-2"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run /bin/bash -c "git commit -m 'Moving nginx.conf.sigil'"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run /bin/bash -c "git push target master:master"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output_contains "Overriding default nginx.conf with detected nginx.conf.sigil" 0
+
+  run /bin/bash -c "dokku nginx:set $TEST_APP nginx-conf-sigil-path nginx.conf.sigil-2"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+
+  run /bin/bash -c "dokku ps:rebuild $TEST_APP"
+  echo "output: $output"
+  echo "status: $status"
+  assert_success
+  assert_output_contains "Overriding default nginx.conf with detected nginx.conf.sigil"
+
+  popd
+  rm -rf "$TMP"
+}