Method TestWRR_Metrics_SubConnWeight

balancer/weightedroundrobin/metrics_test.go:41–132

TestWRR_Metrics_SubConnWeight tests different scenarios for the weight call on a weighted SubConn, and expects certain metrics for each of these scenarios.

(t *testing.T)

// on a weighted SubConn, and expects certain metrics for each of these
// scenarios.
func (s) TestWRR_Metrics_SubConnWeight(t *testing.T) {
	tests := []struct {
		name                           string
		weightExpirationPeriod         time.Duration
		blackoutPeriod                 time.Duration
		lastUpdated                    time.Time
		nonEmpty                       time.Time
		nowTime                        time.Time
		endpointWeightStaleWant        float64
		endpointWeightNotYetUsableWant float64
		endpointWeightWant             float64
	}{
		// The weighted SubConn's lastUpdated field hasn't been set, so this
		// SubConn's weight is not yet usable. Thus, should emit that endpoint
		// weight is not yet usable, and 0 for weight.
		{
			name:                           "no weight set",
			weightExpirationPeriod:         time.Second,
			blackoutPeriod:                 time.Second,
			nowTime:                        time.Now(),
			endpointWeightStaleWant:        0,
			endpointWeightNotYetUsableWant: 1,
			endpointWeightWant:             0,
		},
		{
			name:                           "weight expiration",
			lastUpdated:                    time.Now(),
			weightExpirationPeriod:         2 * time.Second,
			blackoutPeriod:                 time.Second,
			nowTime:                        time.Now().Add(100 * time.Second),
			endpointWeightStaleWant:        1,
			endpointWeightNotYetUsableWant: 0,
			endpointWeightWant:             0,
		},
		{
			name:                           "in blackout period",
			lastUpdated:                    time.Now(),
			weightExpirationPeriod:         time.Minute,
			blackoutPeriod:                 10 * time.Second,
			nowTime:                        time.Now(),
			endpointWeightStaleWant:        0,
			endpointWeightNotYetUsableWant: 1,
			endpointWeightWant:             0,
		},
		{
			name:                           "normal weight",
			lastUpdated:                    time.Now(),
			nonEmpty:                       time.Now(),
			weightExpirationPeriod:         time.Minute,
			blackoutPeriod:                 time.Second,
			nowTime:                        time.Now().Add(10 * time.Second),
			endpointWeightStaleWant:        0,
			endpointWeightNotYetUsableWant: 0,
			endpointWeightWant:             3,
		},
		{
			name:                           "weight expiration takes precdedence over blackout",
			lastUpdated:                    time.Now(),