| // Copyright 2014 The Prometheus Authors |
| // 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 prometheus |
| |
| import ( |
| "fmt" |
| "math" |
| "testing" |
| |
| dto "github.com/prometheus/client_model/go" |
| ) |
| |
| func TestCounterAdd(t *testing.T) { |
| counter := NewCounter(CounterOpts{ |
| Name: "test", |
| Help: "test help", |
| ConstLabels: Labels{"a": "1", "b": "2"}, |
| }).(*counter) |
| counter.Inc() |
| if expected, got := 0.0, math.Float64frombits(counter.valBits); expected != got { |
| t.Errorf("Expected %f, got %f.", expected, got) |
| } |
| if expected, got := uint64(1), counter.valInt; expected != got { |
| t.Errorf("Expected %d, got %d.", expected, got) |
| } |
| counter.Add(42) |
| if expected, got := 0.0, math.Float64frombits(counter.valBits); expected != got { |
| t.Errorf("Expected %f, got %f.", expected, got) |
| } |
| if expected, got := uint64(43), counter.valInt; expected != got { |
| t.Errorf("Expected %d, got %d.", expected, got) |
| } |
| |
| counter.Add(24.42) |
| if expected, got := 24.42, math.Float64frombits(counter.valBits); expected != got { |
| t.Errorf("Expected %f, got %f.", expected, got) |
| } |
| if expected, got := uint64(43), counter.valInt; expected != got { |
| t.Errorf("Expected %d, got %d.", expected, got) |
| } |
| |
| if expected, got := "counter cannot decrease in value", decreaseCounter(counter).Error(); expected != got { |
| t.Errorf("Expected error %q, got %q.", expected, got) |
| } |
| |
| m := &dto.Metric{} |
| counter.Write(m) |
| |
| if expected, got := `label:<name:"a" value:"1" > label:<name:"b" value:"2" > counter:<value:67.42 > `, m.String(); expected != got { |
| t.Errorf("expected %q, got %q", expected, got) |
| } |
| } |
| |
| func decreaseCounter(c *counter) (err error) { |
| defer func() { |
| if e := recover(); e != nil { |
| err = e.(error) |
| } |
| }() |
| c.Add(-1) |
| return nil |
| } |
| |
| func TestCounterVecGetMetricWithInvalidLabelValues(t *testing.T) { |
| testCases := []struct { |
| desc string |
| labels Labels |
| }{ |
| { |
| desc: "non utf8 label value", |
| labels: Labels{"a": "\xFF"}, |
| }, |
| { |
| desc: "not enough label values", |
| labels: Labels{}, |
| }, |
| { |
| desc: "too many label values", |
| labels: Labels{"a": "1", "b": "2"}, |
| }, |
| } |
| |
| for _, test := range testCases { |
| counterVec := NewCounterVec(CounterOpts{ |
| Name: "test", |
| }, []string{"a"}) |
| |
| labelValues := make([]string, len(test.labels)) |
| for _, val := range test.labels { |
| labelValues = append(labelValues, val) |
| } |
| |
| expectPanic(t, func() { |
| counterVec.WithLabelValues(labelValues...) |
| }, fmt.Sprintf("WithLabelValues: expected panic because: %s", test.desc)) |
| expectPanic(t, func() { |
| counterVec.With(test.labels) |
| }, fmt.Sprintf("WithLabelValues: expected panic because: %s", test.desc)) |
| |
| if _, err := counterVec.GetMetricWithLabelValues(labelValues...); err == nil { |
| t.Errorf("GetMetricWithLabelValues: expected error because: %s", test.desc) |
| } |
| if _, err := counterVec.GetMetricWith(test.labels); err == nil { |
| t.Errorf("GetMetricWith: expected error because: %s", test.desc) |
| } |
| } |
| } |
| |
| func expectPanic(t *testing.T, op func(), errorMsg string) { |
| defer func() { |
| if err := recover(); err == nil { |
| t.Error(errorMsg) |
| } |
| }() |
| |
| op() |
| } |
| |
| func TestCounterAddInf(t *testing.T) { |
| counter := NewCounter(CounterOpts{ |
| Name: "test", |
| Help: "test help", |
| }).(*counter) |
| |
| counter.Inc() |
| if expected, got := 0.0, math.Float64frombits(counter.valBits); expected != got { |
| t.Errorf("Expected %f, got %f.", expected, got) |
| } |
| if expected, got := uint64(1), counter.valInt; expected != got { |
| t.Errorf("Expected %d, got %d.", expected, got) |
| } |
| |
| counter.Add(math.Inf(1)) |
| if expected, got := math.Inf(1), math.Float64frombits(counter.valBits); expected != got { |
| t.Errorf("valBits expected %f, got %f.", expected, got) |
| } |
| if expected, got := uint64(1), counter.valInt; expected != got { |
| t.Errorf("valInts expected %d, got %d.", expected, got) |
| } |
| |
| counter.Inc() |
| if expected, got := math.Inf(1), math.Float64frombits(counter.valBits); expected != got { |
| t.Errorf("Expected %f, got %f.", expected, got) |
| } |
| if expected, got := uint64(2), counter.valInt; expected != got { |
| t.Errorf("Expected %d, got %d.", expected, got) |
| } |
| |
| m := &dto.Metric{} |
| counter.Write(m) |
| |
| if expected, got := `counter:<value:inf > `, m.String(); expected != got { |
| t.Errorf("expected %q, got %q", expected, got) |
| } |
| } |
| |
| func TestCounterAddLarge(t *testing.T) { |
| counter := NewCounter(CounterOpts{ |
| Name: "test", |
| Help: "test help", |
| }).(*counter) |
| |
| // large overflows the underlying type and should therefore be stored in valBits. |
| large := float64(math.MaxUint64 + 1) |
| counter.Add(large) |
| if expected, got := large, math.Float64frombits(counter.valBits); expected != got { |
| t.Errorf("valBits expected %f, got %f.", expected, got) |
| } |
| if expected, got := uint64(0), counter.valInt; expected != got { |
| t.Errorf("valInts expected %d, got %d.", expected, got) |
| } |
| |
| m := &dto.Metric{} |
| counter.Write(m) |
| |
| if expected, got := fmt.Sprintf("counter:<value:%0.16e > ", large), m.String(); expected != got { |
| t.Errorf("expected %q, got %q", expected, got) |
| } |
| } |
| |
| func TestCounterAddSmall(t *testing.T) { |
| counter := NewCounter(CounterOpts{ |
| Name: "test", |
| Help: "test help", |
| }).(*counter) |
| small := 0.000000000001 |
| counter.Add(small) |
| if expected, got := small, math.Float64frombits(counter.valBits); expected != got { |
| t.Errorf("valBits expected %f, got %f.", expected, got) |
| } |
| if expected, got := uint64(0), counter.valInt; expected != got { |
| t.Errorf("valInts expected %d, got %d.", expected, got) |
| } |
| |
| m := &dto.Metric{} |
| counter.Write(m) |
| |
| if expected, got := fmt.Sprintf("counter:<value:%0.0e > ", small), m.String(); expected != got { |
| t.Errorf("expected %q, got %q", expected, got) |
| } |
| } |