github.com/uber/kraken@v0.1.4/lib/hrw/testutils_test.go (about)

     1  // Copyright (c) 2016-2019 Uber Technologies, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  package hrw
    15  
    16  import (
    17  	"testing"
    18  
    19  	"github.com/stretchr/testify/assert"
    20  )
    21  
    22  // assertKeyDistribution makes sure the ratio of keys falls in a particular
    23  // bucket conforms to general weight distribution within delta.
    24  func assertKeyDistribution(
    25  	t *testing.T, rh *RendezvousHash, nodekeys NodeKeysTable,
    26  	numKeys int, totalWeights float64, delta float64) {
    27  
    28  	for name, v := range nodekeys {
    29  		node, _ := rh.GetNode(name)
    30  		assert.NotEqual(t, node, nil)
    31  
    32  		assert.InDelta(
    33  			t, float64(len(v))/float64(numKeys), float64(node.Weight)/totalWeights, delta)
    34  	}
    35  }
    36  
    37  type ByScore []float64
    38  
    39  func (a ByScore) Len() int           { return len(a) }
    40  func (a ByScore) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
    41  func (a ByScore) Less(i, j int) bool { return a[i] < a[j] }