// Copyright (c) 2019 The Jaeger Authors.
// Copyright (c) 2017 Uber Technologies, Inc.
//
// 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 model_test

import (
	"errors"
	"fmt"
	"io"
	"testing"

	"github.com/stretchr/testify/assert"

	"github.com/jaegertracing/jaeger/model"
)

type mockHashWwiterAnswer struct {
	n   int
	err error
}

type mockHashWwiter struct {
	answers []mockHashWwiterAnswer
}

func (w *mockHashWwiter) Write(data []byte) (int, error) {
	if len(w.answers) == 0 {
		return 0, fmt.Errorf("no answer registered for call with data=%+v", data)
	}
	answer := w.answers[0]
	w.answers = w.answers[1:]
	return answer.n, answer.err
}

type errHashable struct {
	err error
}

func (e *errHashable) Hash(w io.Writer) error {
	return e.err
}

func TestHasCodeError(t *testing.T) {
	someErr := errors.New("some error")
	h := &errHashable{err: someErr}
	n, err := model.HashCode(h)
	assert.Equal(t, uint64(0), n)
	assert.Equal(t, someErr, err)
}
