prometheus/testutil/testutil.go

// The MIT License (MIT)

// Copyright (c) 2014 Ben Johnson

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

package testutil

import (
	"fmt"
	"path/filepath"
	"reflect"
	"runtime"
	"testing"
)

// Assert fails the test if the condition is false.
func Assert(tb testing.TB, condition bool, msg string, v ...interface{}) {
	if !condition {
		_, file, line, _ := runtime.Caller(1)
		fmt.Printf("\033[31m%s:%d: "+msg+"\033[39m\n\n", append([]interface{}{filepath.Base(file), line}, v...)...)
		tb.FailNow()
	}
}

// Ok fails the test if an err is not nil.
func Ok(tb testing.TB, err error) {
	if err != nil {
		_, file, line, _ := runtime.Caller(1)
		fmt.Printf("\033[31m%s:%d: unexpected error: %s\033[39m\n\n", filepath.Base(file), line, err.Error())
		tb.FailNow()
	}
}

// NotOk fails the test if an err is nil.
func NotOk(tb testing.TB, err error) {
	if err == nil {
		_, file, line, _ := runtime.Caller(1)
		fmt.Printf("\033[31m%s:%d: expected error, got nothing \033[39m\n\n", filepath.Base(file), line)
		tb.FailNow()
	}
}

// Equals fails the test if exp is not equal to act.
func Equals(tb testing.TB, exp, act interface{}, msgAndArgs ...interface{}) {
	if !reflect.DeepEqual(exp, act) {
		_, file, line, _ := runtime.Caller(1)
		fmt.Printf("\033[31m%s:%d:%s\n\n\texp: %#v\n\n\tgot: %#v\033[39m\n\n", filepath.Base(file), line, formatMessage(msgAndArgs), exp, act)
		tb.FailNow()
	}
}

func formatMessage(msgAndArgs []interface{}) string {
	if len(msgAndArgs) == 0 {
		return ""
	}

	if msg, ok := msgAndArgs[0].(string); ok {
		return fmt.Sprintf("\n\nmsg: "+msg, msgAndArgs[1:]...)
	}
	return ""
}