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|
package reexec
import (
"context"
"errors"
"fmt"
"os"
"os/exec"
"path/filepath"
"reflect"
"strings"
"testing"
"time"
)
const (
testReExec = "test-reexec"
testReExec2 = "test-reexec2"
testReExec3 = "test-reexec3"
)
func init() {
Register(testReExec, func() {
panic("Return Error")
})
Register(testReExec2, func() {
var args string
if len(os.Args) > 1 {
args = fmt.Sprintf("(args: %#v)", os.Args[1:])
}
fmt.Println("Hello", testReExec2, args)
os.Exit(0)
})
Register(testReExec3, func() {
fmt.Println("Hello " + testReExec3)
time.Sleep(1 * time.Second)
os.Exit(0)
})
Init()
}
func TestRegister(t *testing.T) {
tests := []struct {
doc string
name string
expectedErr string
}{
{
doc: "duplicate name",
name: testReExec,
expectedErr: `reexec func already registered under name "test-reexec"`,
},
{
doc: "invalid name",
name: filepath.Join("something", testReExec),
expectedErr: fmt.Sprintf("reexec func does not expect a path component: %q", filepath.Join("something", testReExec)),
},
}
for _, tc := range tests {
t.Run(tc.doc, func(t *testing.T) {
defer func() {
r := recover()
if r == nil {
t.Errorf("Register() did not panic")
return
}
if r != tc.expectedErr {
t.Errorf("got %q, want %q", r, tc.expectedErr)
}
}()
Register(tc.name, func() {})
})
}
}
func TestCommand(t *testing.T) {
tests := []struct {
doc string
cmdAndArgs []string
expOut string
}{
{
doc: "basename",
cmdAndArgs: []string{testReExec2},
expOut: "Hello test-reexec2",
},
{
doc: "full path",
cmdAndArgs: []string{filepath.Join("something", testReExec2)},
expOut: `Hello test-reexec2`,
},
{
doc: "command with args",
cmdAndArgs: []string{testReExec2, "--some-flag", "some-value", "arg1", "arg2"},
expOut: `Hello test-reexec2 (args: []string{"--some-flag", "some-value", "arg1", "arg2"})`,
},
}
for _, tc := range tests {
t.Run(tc.doc, func(t *testing.T) {
cmd := Command(tc.cmdAndArgs...)
if !reflect.DeepEqual(cmd.Args, tc.cmdAndArgs) {
t.Fatalf("got %+v, want %+v", cmd.Args, tc.cmdAndArgs)
}
w, err := cmd.StdinPipe()
if err != nil {
t.Fatalf("Error on pipe creation: %v", err)
}
defer func() { _ = w.Close() }()
out, err := cmd.CombinedOutput()
if err != nil {
t.Errorf("Error on re-exec cmd: %v, out: %v", err, string(out))
}
actual := strings.TrimSpace(string(out))
if actual != tc.expOut {
t.Errorf("got %v, want %v", actual, tc.expOut)
}
})
}
}
func TestCommandContext(t *testing.T) {
testError := errors.New("test-error: the command was canceled")
tests := []struct {
doc string
cmdAndArgs []string
cancel bool
expOut string
expError error
}{
{
doc: "basename",
cmdAndArgs: []string{testReExec2},
expOut: "Hello test-reexec2",
},
{
doc: "full path",
cmdAndArgs: []string{filepath.Join("something", testReExec2)},
expOut: "Hello test-reexec2",
},
{
doc: "command with args",
cmdAndArgs: []string{testReExec2, "--some-flag", "some-value", "arg1", "arg2"},
expOut: `Hello test-reexec2 (args: []string{"--some-flag", "some-value", "arg1", "arg2"})`,
},
{
doc: "context canceled",
cancel: true,
cmdAndArgs: []string{testReExec2},
expError: context.Canceled,
},
{
doc: "context timeout",
cmdAndArgs: []string{testReExec3},
expOut: "Hello test-reexec3",
expError: testError,
},
}
for _, tc := range tests {
t.Run(tc.doc, func(t *testing.T) {
ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
defer cancel()
cmd := CommandContext(ctx, tc.cmdAndArgs...)
if !reflect.DeepEqual(cmd.Args, tc.cmdAndArgs) {
t.Fatalf("got %+v, want %+v", cmd.Args, tc.cmdAndArgs)
}
cmd.Cancel = func() error {
return testError
}
w, err := cmd.StdinPipe()
if err != nil {
t.Fatalf("Error on pipe creation: %v", err)
}
defer func() { _ = w.Close() }()
if tc.cancel {
cancel()
}
out, err := cmd.CombinedOutput()
if !errors.Is(err, tc.expError) {
t.Errorf("expected %v, got: %v", tc.expError, err)
}
actual := strings.TrimSpace(string(out))
if actual != tc.expOut {
t.Errorf("got %v, want %v", actual, tc.expOut)
}
})
}
}
func TestNaiveSelf(t *testing.T) {
if os.Getenv("TEST_CHECK") == "1" {
os.Exit(2)
}
cmd := exec.Command(naiveSelf(), "-test.run=TestNaiveSelf")
cmd.Env = append(os.Environ(), "TEST_CHECK=1")
err := cmd.Start()
if err != nil {
t.Fatalf("Unable to start command: %v", err)
}
err = cmd.Wait()
var expError *exec.ExitError
if !errors.As(err, &expError) {
t.Fatalf("got %T, want %T", err, expError)
}
const expected = "exit status 2"
if err.Error() != expected {
t.Fatalf("got %v, want %v", err, expected)
}
os.Args[0] = "mkdir"
if naiveSelf() == os.Args[0] {
t.Fatalf("Expected naiveSelf to resolve the location of mkdir")
}
}
|
