Currently I am using the following code to mock the exec.Command. But there
are two issues:
1. I expect the code being tested gets the expected output message (value
of the variable 'msg') from STDOUT, but actually what it gets from STDOUT
is always "PASS", which should be the output of the golang unit test result.
2. When the exit code of "TestHelperCommand" is non-zero, then I expect the
function which calls fakeExecCommand should get an error response, but it
doesn't. What do I miss?
// fakeExecCommand is used to replace the real command in unit test
func fakeExecCommand(executable string, args ...string) *exec.Cmd {
newArgs := []string{"-test.run=TestHelperCommand", "--", executable}
newArgs = append(newArgs, args...)
cmd := exec.Command(os.Args[0], newArgs...)
cmd.Env = []string{
"USE_HELPER_COMMAND=1",
fmt.Sprintf("STDOUT=%s", msg),
fmt.Sprintf("EXIT_STATUS=%d", exitCode),
}
return cmd
}
func TestHelperCommand(t *testing.T) {
if os.Getenv("USE_HELPER_COMMAND") != "1" {
return
}
stdOutMsg := os.Getenv("STDOUT")
if len(stdOutMsg) > 0 {
fmt.Fprintf(os.Stdout, stdOutMsg)
}
stdErrMsg := os.Getenv("STDERR")
if len(stdErrMsg) > 0 {
fmt.Fprintf(os.Stderr, stdErrMsg)
}
exitCode, _ := strconv.Atoi(os.Getenv("EXIT_STATUS"))
os.Exit(exitCode)
}在此输入代码...
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