// Copyright 2020 Google Inc. All Rights Reserved.
//
// 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 metrics

import (
	"testing"
	"time"
)

func TestEnd(t *testing.T) {
	startTime := time.Date(2020, time.July, 13, 13, 0, 0, 0, time.UTC)
	dur := time.Nanosecond * 10
	initialNow := _now
	_now = func() time.Time { return startTime.Add(dur) }
	defer func() { _now = initialNow }()

	et := &EventTracer{}
	et.push(&event{
		desc:  "test",
		name:  "test",
		start: startTime,
	})

	perf := et.End()
	if perf.GetRealTime() != uint64(dur.Nanoseconds()) {
		t.Errorf("got %d, want %d nanoseconds for event duration", perf.GetRealTime(), dur.Nanoseconds())
	}
}

func TestEndWithError(t *testing.T) {
	startTime := time.Date(2020, time.July, 13, 13, 0, 0, 0, time.UTC)
	dur := time.Nanosecond * 10
	initialNow := _now
	_now = func() time.Time { return startTime.Add(dur) }
	defer func() { _now = initialNow }()

	err := "foobar"
	et := &EventTracer{}
	et.push(&event{
		desc:            "test",
		name:            "test",
		start:           startTime,
		nonZeroExitCode: true,
		errorMsg:        &err,
	})

	perf := et.End()
	if msg := perf.GetErrorMessage(); msg != err {
		t.Errorf("got %q, want %q for even error message", msg, err)
	}
}