path: root/cmd/geth/run_test.go

// Copyright 2016 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.

package main

import (
    "fmt"
    "io/ioutil"
    "os"
    "testing"

    "github.com/docker/docker/pkg/reexec"
    "github.com/ethereum/go-ethereum/internal/cmdtest"
)

func tmpdir(t *testing.T) string {
    dir, err := ioutil.TempDir("", "geth-test")
    if err != nil {
        t.Fatal(err)
    }
    return dir
}

type testgeth struct {
    *cmdtest.TestCmd

    // template variables for expect
    Datadir   string
    Etherbase string
}

func init() {
    // Run the app if we've been exec'd as "geth-test" in runGeth.
    reexec.Register("geth-test", func() {
        if err := app.Run(os.Args); err != nil {
            fmt.Fprintln(os.Stderr, err)
            os.Exit(1)
        }
        os.Exit(0)
    })
}

func TestMain(m *testing.M) {
    // check if we have been reexec'd
    if reexec.Init() {
        return
    }
    os.Exit(m.Run())
}

// spawns geth with the given command line args. If the args don't set --datadir, the
// child g gets a temporary data directory.
func runGeth(t *testing.T, args ...string) *testgeth {
    tt := &testgeth{}
    tt.TestCmd = cmdtest.NewTestCmd(t, tt)
    for i, arg := range args {
        switch {
        case arg == "-datadir" || arg == "--datadir":
            if i < len(args)-1 {
                tt.Datadir = args[i+1]
            }
        case arg == "-etherbase" || arg == "--etherbase":
            if i < len(args)-1 {
                tt.Etherbase = args[i+1]
            }
        }
    }
    if tt.Datadir == "" {
        tt.Datadir = tmpdir(t)
        tt.Cleanup = func() { os.RemoveAll(tt.Datadir) }
        args = append([]string{"-datadir", tt.Datadir}, args...)
        // Remove the temporary datadir if something fails below.
        defer func() {
            if t.Failed() {
                tt.Cleanup()
            }
        }()
    }

    // Boot "geth". This actually runs the test binary but the TestMain
    // function will prevent any tests from running.
    tt.Run("geth-test", args...)

    return tt
}