func testCommandInvokerCancel(t *testing.T, invoke CommandInvoker, cancelFlag task.CancelFlag, testCase TestCase) {
go func() {
time.Sleep(100 * time.Millisecond)
cancelFlag.Set(task.Canceled)
}()
start := time.Now()
stdout, stderr, exitCode, errs := invoke(testCase.Commands)
duration := time.Since(start)
// test that the job returned before the normal time
assert.True(t, duration.Seconds() <= cancelWaitTimeoutSeconds, "The command took too long to kill (%v)!", duration)
// test that we receive kill exception
assert.Equal(t, len(errs), 1)
assert.IsType(t, &exec.ExitError{}, errs[0])
assertReaderEquals(t, testCase.ExpectedStdout, stdout)
assertReaderEquals(t, testCase.ExpectedStderr, stderr)
assert.Equal(t, exitCode, testCase.ExpectedExitCode)
}
