/*
Copyright 2023 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package unittests

import (
	"bytes"
	"flag"
	"testing"

	"github.com/stretchr/testify/require"
	"k8s.io/kubernetes/test/e2e/framework"
)

// GetFrameworkOutput captures writes to framework.Output during a test suite setup
// and returns it together with any explicit Exit call code, -1 if none.
// May only be called once per test binary.
func GetFrameworkOutput(t *testing.T, flags map[string]string) (output string, finalExitCode int) {
	// This simulates how test/e2e uses the framework and how users
	// invoke test/e2e.
	framework.RegisterCommonFlags(flag.CommandLine)
	framework.RegisterClusterFlags(flag.CommandLine)
	for flagname, value := range flags {
		require.NoError(t, flag.Set(flagname, value), "set %s", flagname)
	}
	var buffer bytes.Buffer
	framework.Output = &buffer
	framework.Exit = func(code int) {
		panic(exitCode(code))
	}
	finalExitCode = -1
	defer func() {
		if r := recover(); r != nil {
			if code, ok := r.(exitCode); ok {
				finalExitCode = int(code)
			} else {
				panic(r)
			}
		}
		output = buffer.String()
	}()
	framework.AfterReadingAllFlags(&framework.TestContext)

	// Results set by defer.
	return
}

type exitCode int