tools/devshell/tests/fx-internal/optional-features_test

#!/bin/bash
# Copyright 2020 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

### Test expected behavior of optional features library

BT_FILE_DEPS=(
  "scripts/fx"
  "tools/devshell/lib/fx-cmd-locator.sh"
  "tools/devshell/lib/fx-optional-features.sh"
  "tools/devshell/lib/vars.sh"
  "tools/devshell/lib/platform.sh"
)

declare fx valid_feature

BT_SET_UP() {
  source "${BT_TEMP_DIR}/tools/devshell/tests/lib/fuchsia-mock.sh"
  fx="$(btf::setup_fx)"
  source "${BT_TEMP_DIR}/tools/devshell/lib/fx-optional-features.sh"
  # get the first valid feature defined in an array in fx-optional-features.sh
  # if there are no optional features, this variable will
  # be empty and the tests that depend on it should return SUCCESS.
  valid_feature="${_FX_OPTIONAL_FEATURES[0]}"
}

TEST_disable_feature() {
  if [[ -z "${valid_feature}" ]]; then
    # cannot test without a valid feature to be disabled
    return 0
  fi
  local cmd="mycmd"
  local cmd_path="${BT_TEMP_DIR}/tools/devshell/${cmd}"
  mkdir -p "$(dirname "${cmd_path}")"
  # create a command that runs is_feature_enabled and returns its exit code
  cat >"${cmd_path}" <<EOF
#!/bin/bash
source ${BT_TEMP_DIR}/tools/devshell/lib/fx-optional-features.sh || exit \$\?
is_feature_enabled "${valid_feature}"
EOF
  chmod u+x "${cmd_path}"
  # check that the command, when executed through fx, works as intended for
  # an optional feature. It should return 0 (true), since the feature
  # is not disabled explicitly, hence enabled.
  BT_EXPECT ${fx} ${cmd}

  # Now it should return false, since the feature is explicitly disabled
  # in the fx invocation.
  BT_EXPECT_FAIL ${fx} --disable=${valid_feature} ${cmd}
}

BT_RUN_TESTS "$@"