tests/core/transition/cmdline_test.go

// Copyright 2020 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package cmdline_test

import (
	"bytes"
	"testing"

	"github.com/bazelbuild/rules_go/go/tools/bazel_testing"
)

func TestMain(m *testing.M) {
	bazel_testing.TestMain(m, bazel_testing.Args{
		Main: `
-- BUILD.bazel --
load("@io_bazel_rules_go//go:def.bzl", "go_binary")

go_binary(
    name = "maybe_pure",
    srcs = [
        "not_pure.go",
        "pure.go",
    ],
)

-- not_pure.go --
// +build cgo

package main

import "fmt"

func main() {
	fmt.Println("not pure")
}

-- pure.go --
// +build !cgo

package main

import "fmt"

func main() {
	fmt.Println("pure")
}
`,
	})
}

// TestPure checks that the --@io_bazel_rules_go//go/config:pure flag controls
// whether a target is built in pure mode. It doesn't actually require cgo,
// since that doesn't work within go_bazel_test on Windows.
func TestPure(t *testing.T) {
	out, err := bazel_testing.BazelOutput("run", "//:maybe_pure")
	if err != nil {
		t.Fatalf("running //:maybe_pure without flag: %v", err)
	}
	got := string(bytes.TrimSpace(out))
	if want := "not pure"; got != want {
		t.Fatalf("got %q; want %q", got, want)
	}

	out, err = bazel_testing.BazelOutput("run", "--@io_bazel_rules_go//go/config:pure", "//:maybe_pure")
	if err != nil {
		t.Fatalf("running //:maybe_pure with flag: %v", err)
	}
	got = string(bytes.TrimSpace(out))
	if want := "pure"; got != want {
		t.Fatalf("got %q; want %q", got, want)
	}
}