client_golang/metrics/tallying_bucket_test.go

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2012-05-20 01:59:25 +04:00
// Copyright (c) 2012, Matt T. Proud
// All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// tallying_bucket_test.go provides a test complement for the
// tallying_bucket.go module.
package metrics
import (
"github.com/matttproud/golang_instrumentation/maths"
. "launchpad.net/gocheck"
)
func (s *S) TestTallyingPercentileEstimatorMinimum(c *C) {
c.Assert(Minimum(-2, -1, 0, 0), maths.IsNaN)
c.Check(Minimum(-2, -1, 0, 1), Equals, -2.0)
}
func (s *S) TestTallyingPercentileEstimatorMaximum(c *C) {
c.Assert(Maximum(-2, -1, 0, 0), maths.IsNaN)
c.Check(Maximum(-2, -1, 0, 1), Equals, -1.0)
}
func (s *S) TestTallyingPercentilesEstimatorAverage(c *C) {
c.Assert(Average(-2, -1, 0, 0), maths.IsNaN)
c.Check(Average(-2, -2, 0, 1), Equals, -2.0)
c.Check(Average(-1, -1, 0, 1), Equals, -1.0)
c.Check(Average(1, 1, 0, 2), Equals, 1.0)
c.Check(Average(2, 1, 0, 2), Equals, 1.5)
}
func (s *S) TestTallyingPercentilesEstimatorUniform(c *C) {
c.Assert(Uniform(-5, 5, 0, 0), maths.IsNaN)
// TODO(mtp): Rewrite.
// for i := 0.0; i < 33.3; i += 0.1 {
// c.Check(Uniform(-5, 5, i, 2), Equals, -5.0)
// }
// for i := 33.4; i < 66.0; i += 0.1 {
// c.Check(Uniform(-5, 5, i, 2), Equals, 0.0)
// }
// for i := 66.7; i < 100.0; i += 0.1 {
// c.Check(Uniform(-5, 5, i, 2), Equals, 5.0)
// }
}
func (s *S) TestTallyingBucketBuilder(c *C) {
var bucket Bucket = TallyingBucketBuilder()
c.Assert(bucket, Not(IsNil))
}
func (s *S) TestTallyingBucketHumanize(c *C) {
bucket := TallyingBucket{
observations: 3,
smallestObserved: 2.0,
largestObserved: 5.5,
}
c.Check(bucket.Humanize(), Equals, "[TallyingBucket (2.000000, 5.500000); 3 items]")
}
func (s *S) TestTallyingBucketAdd(c *C) {
b := DefaultTallyingBucket()
b.Add(1)
c.Check(b.observations, Equals, 1)
c.Check(b.Observations(), Equals, 1)
c.Check(b.smallestObserved, Equals, 1.0)
c.Check(b.largestObserved, Equals, 1.0)
b.Add(2)
c.Check(b.observations, Equals, 2)
c.Check(b.Observations(), Equals, 2)
c.Check(b.smallestObserved, Equals, 1.0)
c.Check(b.largestObserved, Equals, 2.0)
}