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package memmetrics
import (
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/vulcand/oxy/v2/internal/holsterv4/clock"
"github.com/vulcand/oxy/v2/testutils"
)
func TestNewRatioCounterInvalidParams(t *testing.T) {
done := testutils.FreezeTime()
defer done()
// Bad buckets count
_, err := NewRatioCounter(0, clock.Second)
require.Error(t, err)
// Too precise resolution
_, err = NewRatioCounter(10, clock.Millisecond)
require.Error(t, err)
}
func TestNotReady(t *testing.T) {
done := testutils.FreezeTime()
defer done()
// No data
fr, err := NewRatioCounter(10, clock.Second)
require.NoError(t, err)
assert.Equal(t, false, fr.IsReady())
assert.Equal(t, 0.0, fr.Ratio())
// Not enough data
fr, err = NewRatioCounter(10, clock.Second)
require.NoError(t, err)
fr.CountA()
assert.Equal(t, false, fr.IsReady())
}
func TestNoB(t *testing.T) {
done := testutils.FreezeTime()
defer done()
fr, err := NewRatioCounter(1, clock.Second)
require.NoError(t, err)
fr.IncA(1)
assert.Equal(t, true, fr.IsReady())
assert.Equal(t, 1.0, fr.Ratio())
}
func TestNoA(t *testing.T) {
done := testutils.FreezeTime()
defer done()
fr, err := NewRatioCounter(1, clock.Second)
require.NoError(t, err)
fr.IncB(1)
assert.Equal(t, true, fr.IsReady())
assert.Equal(t, 0.0, fr.Ratio())
}
// Make sure that data is properly calculated over several buckets.
func TestMultipleBuckets(t *testing.T) {
done := testutils.FreezeTime()
defer done()
fr, err := NewRatioCounter(3, clock.Second)
require.NoError(t, err)
fr.IncB(1)
clock.Advance(clock.Second)
fr.IncA(1)
clock.Advance(clock.Second)
fr.IncA(1)
assert.Equal(t, true, fr.IsReady())
assert.Equal(t, float64(2)/float64(3), fr.Ratio())
}
// Make sure that data is properly calculated over several buckets
// When we overwrite old data when the window is rolling.
func TestOverwriteBuckets(t *testing.T) {
done := testutils.FreezeTime()
defer done()
fr, err := NewRatioCounter(3, clock.Second)
require.NoError(t, err)
fr.IncB(1)
clock.Advance(clock.Second)
fr.IncA(1)
clock.Advance(clock.Second)
fr.IncA(1)
// This time we should overwrite the old data points
clock.Advance(clock.Second)
fr.IncA(1)
fr.IncB(2)
assert.Equal(t, true, fr.IsReady())
assert.Equal(t, float64(3)/float64(5), fr.Ratio())
}
// Make sure we cleanup the data after periods of inactivity
// So it does not mess up the stats.
func TestInactiveBuckets(t *testing.T) {
done := testutils.FreezeTime()
defer done()
fr, err := NewRatioCounter(3, clock.Second)
require.NoError(t, err)
fr.IncB(1)
clock.Advance(clock.Second)
fr.IncA(1)
clock.Advance(clock.Second)
fr.IncA(1)
// This time we should overwrite the old data points with new data
clock.Advance(clock.Second)
fr.IncA(1)
fr.IncB(2)
// Jump to the last bucket and change the data
clock.Advance(clock.Second * 2)
fr.IncB(1)
assert.Equal(t, true, fr.IsReady())
assert.Equal(t, float64(1)/float64(4), fr.Ratio())
}
func TestLongPeriodsOfInactivity(t *testing.T) {
done := testutils.FreezeTime()
defer done()
fr, err := NewRatioCounter(2, clock.Second)
require.NoError(t, err)
fr.IncB(1)
clock.Advance(clock.Second)
fr.IncA(1)
assert.Equal(t, true, fr.IsReady())
assert.Equal(t, 0.5, fr.Ratio())
// This time we should overwrite all data points
clock.Advance(100 * clock.Second)
fr.IncA(1)
assert.Equal(t, 1.0, fr.Ratio())
}
func TestNewRatioCounterReset(t *testing.T) {
done := testutils.FreezeTime()
defer done()
fr, err := NewRatioCounter(1, clock.Second)
require.NoError(t, err)
fr.IncB(1)
fr.IncA(1)
assert.Equal(t, true, fr.IsReady())
assert.Equal(t, 0.5, fr.Ratio())
// Reset the counter
fr.Reset()
assert.Equal(t, false, fr.IsReady())
// Now add some stats
fr.IncA(2)
// We are game again!
assert.Equal(t, true, fr.IsReady())
assert.Equal(t, 1.0, fr.Ratio())
}
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