# 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.

import("//build/testing/host_test_data.gni")
import("//build/testing/test_spec.gni")

# Declares a host test.
#
# Since the testing infrastructure doesn't handle tests with arguments, this
# template will generate a script that encapsulates the arguments and build the
# relevant test_spec target. This can be used to build data driven tests by
# invoking a host tool with a test specification.
#
# Note: The tool and any data dependencies it has (including files referred to
# by the arguments) MUST be declared by using the host_test_data template.
#
# Parameters
#
#   binary_path (required)
#     [path]: Path to the binary the test should invoke.
#
#   args (optional)
#     [list of strings]: Arguments to pass to the tool.
#
#   target (optional)
#     [label]: The test target. Defaults to target_name.
#
#   deps, environments, data_deps, public_deps, visibility
#     Forwarded from invoker.
#
template("host_test") {
  assert(defined(invoker.binary_path), "Requires a binary_path")
  assert(
      is_host,
      "host_test should only be used on host, to fix this, wrap you target with `if (is_host) { ... }`")

  _test_path = invoker.binary_path

  if (defined(invoker.args)) {
    _test_data_target = "${target_name}_script_data"
    _script_file = "${target_out_dir}/${target_name}.sh"
    _test_path = _script_file
    _test_script_target = "${target_name}_script"

    host_test_data(_test_data_target) {
      sources = [
        _script_file,
        invoker.binary_path,
      ]
      visibility = [ ":*" ]
    }

    action(_test_script_target) {
      testonly = true
      script = "//build/testing/create_test.sh"
      args = [
        rebase_path(_script_file, root_build_dir),
        rebase_path(invoker.binary_path, root_build_dir),
      ]
      args += invoker.args
      outputs = [ "${_script_file}" ]
      visibility = [ ":*" ]

      # The infra currently uses ninja to build host tests, specifying the
      # test_spec.path field as the target. Thus we have to ensure that
      # this target has all the dependencies neede to actually build the test.
      forward_variables_from(invoker,
                             [
                               "data_deps",
                               "deps",
                               "public_deps",
                             ])
      deps += [ ":${_test_data_target}" ]
    }
  }

  test_spec(target_name) {
    if (defined(invoker.target)) {
      target = invoker.target
    } else {
      target = get_label_info(":${target_name}", "label_with_toolchain")
    }
    path = _test_path

    forward_variables_from(invoker,
                           [
                             "environments",
                             "visibility",
                           ])

    # If we have args, we put most deps on the script target,
    # and here just depend on that.
    if (defined(invoker.args)) {
      deps = [ ":${_test_script_target}" ]
    } else {
      forward_variables_from(invoker,
                             [
                               "data_deps",
                               "deps",
                               "public_deps",
                             ])
    }
  }
}