ring_test.go

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 holmes

import (
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestEmptyRing(t *testing.T) {
	var r = newRing(0)
	assert.Equal(t, r.avg(), 0)

	r = newRing(1)
	assert.Equal(t, r.avg(), 0)
}

func TestRing(t *testing.T) {
	var cases = []struct {
		slice  []int
		maxLen int
		avg    int
	}{
		{
			slice:  []int{1, 2, 3},
			maxLen: 10,
			avg:    2,
		},
		{
			slice:  []int{1, 2, 3},
			maxLen: 1,
			avg:    3,
		},
	}

	for _, cas := range cases {
		var r = newRing(cas.maxLen)
		for _, elem := range cas.slice {
			r.push(elem)
		}
		assert.Equal(t, r.avg(), cas.avg)
	}
}

func Test_ring_humanData(t *testing.T) {
	r := newRing(5)
	var cases = []struct {
		except []int
	}{
		{
			except: []int{1, 0, 0, 0, 0},
		},
		{
			except: []int{1, 2, 0, 0, 0},
		},
		{
			except: []int{1, 2, 3, 0, 0},
		},
		{
			except: []int{1, 2, 3, 4, 0},
		},
		{
			except: []int{1, 2, 3, 4, 5},
		},
		{
			except: []int{2, 3, 4, 5, 6},
		},
		{
			except: []int{3, 4, 5, 6, 7},
		},
		{
			except: []int{4, 5, 6, 7, 8},
		},
		{
			except: []int{5, 6, 7, 8, 9},
		},
		{
			except: []int{6, 7, 8, 9, 10},
		},
	}
	for i := 0; i < 10; i++ {
		r.push(i + 1)
		assert.Equal(t, r.sequentialData(), cases[i].except)
	}
}