Function TestQueryLookbackDelta

promql/engine_test.go:3951–4031

(t *testing.T)

}

func TestQueryLookbackDelta(t *testing.T) {
	var (
		load = `load 5m
metric 0 1 2
`
		query           = "metric"
		lastDatapointTs = time.Unix(600, 0)
	)

	cases := []struct {
		name                          string
		ts                            time.Time
		engineLookback, queryLookback time.Duration
		expectSamples                 bool
	}{
		{
			name:          "default lookback delta",
			ts:            lastDatapointTs.Add(defaultLookbackDelta - time.Millisecond),
			expectSamples: true,
		},
		{
			name:          "outside default lookback delta",
			ts:            lastDatapointTs.Add(defaultLookbackDelta),
			expectSamples: false,
		},
		{
			name:           "custom engine lookback delta",
			ts:             lastDatapointTs.Add(10*time.Minute - time.Millisecond),
			engineLookback: 10 * time.Minute,
			expectSamples:  true,
		},
		{
			name:           "outside custom engine lookback delta",
			ts:             lastDatapointTs.Add(10 * time.Minute),
			engineLookback: 10 * time.Minute,
			expectSamples:  false,
		},
		{
			name:           "custom query lookback delta",
			ts:             lastDatapointTs.Add(20*time.Minute - time.Millisecond),
			engineLookback: 10 * time.Minute,
			queryLookback:  20 * time.Minute,
			expectSamples:  true,
		},
		{
			name:           "outside custom query lookback delta",
			ts:             lastDatapointTs.Add(20 * time.Minute),
			engineLookback: 10 * time.Minute,
			queryLookback:  20 * time.Minute,
			expectSamples:  false,
		},
		{
			name:           "negative custom query lookback delta",
			ts:             lastDatapointTs.Add(20*time.Minute - time.Millisecond),
			engineLookback: -10 * time.Minute,
			queryLookback:  20 * time.Minute,
			expectSamples:  true,
		},