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// Copyright 2020 The Gogs Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package testutil
import (
"errors"
"fmt"
"os"
"os/exec"
"strings"
)
// Exec executes "go test" on given helper with supplied environment variables.
// It is useful to mock "os/exec" functions in tests. When succeeded, it returns
// the result produced by the test helper.
// The test helper should:
// 1. Use WantHelperProcess function to determine if it is being called in helper mode.
// 2. Call fmt.Fprintln(os.Stdout, ...) to print results for the main test to collect.
func Exec(helper string, envs ...string) (string, error) {
cmd := exec.Command(os.Args[0], "-test.run="+helper, "--")
cmd.Env = []string{
"GO_WANT_HELPER_PROCESS=1",
"GOCOVERDIR=" + os.TempDir(),
}
cmd.Env = append(cmd.Env, envs...)
out, err := cmd.CombinedOutput()
str := string(out)
// The error is quite confusing even when tests passed, so let's check whether
// it is passed first.
if strings.Contains(str, "no tests to run") {
return "", errors.New("no tests to run")
} else if i := strings.Index(str, "PASS"); i >= 0 {
// Collect helper result
return strings.TrimSpace(str[:i]), nil
}
if err != nil {
return "", fmt.Errorf("%v - %s", err, str)
}
return "", errors.New(str)
}
// WantHelperProcess returns true if current process is in helper mode.
func WantHelperProcess() bool {
return os.Getenv("GO_WANT_HELPER_PROCESS") == "1"
}
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