105 lines
2.9 KiB
Go
105 lines
2.9 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"fmt"
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"go/build"
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"io"
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"io/ioutil"
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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"testing"
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)
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// This file contains a test that compiles and runs each program in testdata
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// after generating the string method for its type. The rule is that for testdata/x.go
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// we run stringer -type X and then compile and run the program. The resulting
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// binary panics if the String method for X is not correct, including for error cases.
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func TestEndToEnd(t *testing.T) {
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dir, err := ioutil.TempDir("", "stringer")
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defer os.RemoveAll(dir)
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// Create stringer in temporary directory.
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stringer := filepath.Join(dir, "stringer.exe")
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err = run("go", "build", "-o", stringer, "stringer.go")
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if err != nil {
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t.Fatalf("building stringer: %s", err)
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}
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// Read the testdata directory.
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fd, err := os.Open("testdata")
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if err != nil {
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t.Fatal(err)
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}
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defer fd.Close()
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names, err := fd.Readdirnames(-1)
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if err != nil {
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t.Fatalf("Readdirnames: %s", err)
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}
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// Generate, compile, and run the test programs.
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for _, name := range names {
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if !strings.HasSuffix(name, ".go") {
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t.Errorf("%s is not a Go file", name)
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continue
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}
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if name == "cgo.go" && !build.Default.CgoEnabled {
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t.Logf("cgo is no enabled for %s", name)
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continue
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}
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// Names are known to be ASCII and long enough.
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typeName := fmt.Sprintf("%c%s", name[0]+'A'-'a', name[1:len(name)-len(".go")])
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stringerCompileAndRun(t, dir, stringer, typeName, name)
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}
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}
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// stringerCompileAndRun runs stringer for the named file and compiles and
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// runs the target binary in directory dir. That binary will panic if the String method is incorrect.
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func stringerCompileAndRun(t *testing.T, dir, stringer, typeName, fileName string) {
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t.Logf("run: %s %s\n", fileName, typeName)
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source := filepath.Join(dir, fileName)
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err := copy(source, filepath.Join("testdata", fileName))
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if err != nil {
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t.Fatalf("copying file to temporary directory: %s", err)
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}
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stringSource := filepath.Join(dir, typeName+"_string.go")
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// Run stringer in temporary directory.
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err = run(stringer, "-type", typeName, "-output", stringSource, source)
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if err != nil {
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t.Fatal(err)
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}
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// Run the binary in the temporary directory.
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err = run("go", "run", stringSource, source)
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if err != nil {
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t.Fatal(err)
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}
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}
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// copy copies the from file to the to file.
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func copy(to, from string) error {
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toFd, err := os.Create(to)
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if err != nil {
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return err
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}
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defer toFd.Close()
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fromFd, err := os.Open(from)
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if err != nil {
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return err
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}
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defer fromFd.Close()
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_, err = io.Copy(toFd, fromFd)
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return err
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}
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// run runs a single command and returns an error if it does not succeed.
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// os/exec should have this function, to be honest.
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func run(name string, arg ...string) error {
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cmd := exec.Command(name, arg...)
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cmd.Stdout = os.Stdout
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cmd.Stderr = os.Stderr
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return cmd.Run()
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}
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