github.com/m3db/m3@v1.5.0/src/cmd/services/m3coordinator/downsample/async_downsampler_test.go (about)

     1  // Copyright (c) 2018 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package downsample
    22  
    23  import (
    24  	"errors"
    25  	"fmt"
    26  	"sync"
    27  	"testing"
    28  
    29  	"github.com/golang/mock/gomock"
    30  	"github.com/stretchr/testify/assert"
    31  	"github.com/stretchr/testify/require"
    32  )
    33  
    34  func TestAsyncDownsamplerError(t *testing.T) {
    35  	customErr := errors.New("some error")
    36  	expectedErrStr := fmt.Sprintf(errNewDownsamplerFailFmt, customErr)
    37  
    38  	done := make(chan struct{}, 1)
    39  	asyncDownsampler := NewAsyncDownsampler(func() (Downsampler, error) {
    40  		return nil, customErr
    41  	}, done)
    42  	require.NotNil(t, asyncDownsampler)
    43  
    44  	// Wait for downsampler to be done initializing (which we mock to return an error)
    45  	<-done
    46  
    47  	_, err := asyncDownsampler.NewMetricsAppender()
    48  	assert.EqualError(t, err, expectedErrStr)
    49  }
    50  
    51  func TestAsyncDownsamplerUninitialized(t *testing.T) {
    52  	ctrl := gomock.NewController(t)
    53  	defer ctrl.Finish()
    54  
    55  	mockDownsampler := NewMockDownsampler(ctrl)
    56  
    57  	// Sleep until test has finished
    58  	var wg sync.WaitGroup
    59  	wg.Add(1)
    60  	defer wg.Done()
    61  
    62  	asyncDownsampler := NewAsyncDownsampler(func() (Downsampler, error) {
    63  		wg.Wait()
    64  		return mockDownsampler, nil
    65  	}, nil)
    66  	require.NotNil(t, asyncDownsampler)
    67  
    68  	_, err := asyncDownsampler.NewMetricsAppender()
    69  	assert.EqualError(t, err, errDownsamplerUninitialized.Error())
    70  }
    71  
    72  func TestAsyncDownsamplerInitialized(t *testing.T) {
    73  	ctrl := gomock.NewController(t)
    74  	defer ctrl.Finish()
    75  
    76  	mockMetricsAppender := NewMockMetricsAppender(ctrl)
    77  
    78  	mockDownsampler := NewMockDownsampler(ctrl)
    79  	mockDownsampler.EXPECT().NewMetricsAppender().Return(mockMetricsAppender, nil)
    80  
    81  	done := make(chan struct{}, 1)
    82  	asyncDownsampler := NewAsyncDownsampler(func() (Downsampler, error) {
    83  		return mockDownsampler, nil
    84  	}, done)
    85  	require.NotNil(t, asyncDownsampler)
    86  	// Wait for session to be done initializing
    87  	<-done
    88  
    89  	metricsAppender, err := asyncDownsampler.NewMetricsAppender()
    90  	assert.NoError(t, err)
    91  	concreteMetricsAppender, ok := metricsAppender.(*MockMetricsAppender)
    92  	require.True(t, ok)
    93  	assert.True(t, concreteMetricsAppender == mockMetricsAppender)
    94  }