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package lfring
import (
. "gopkg.in/check.v1"
)
func (s *MySuite) TestFindPowerOfTwo(c *C) {
// given
cap1 := uint64(0)
cap2 := uint64(10)
cap3 := uint64(16)
cap4 := uint64(33)
cap5 := ^uint64(0)
// when
res1 := findPowerOfTwo(cap1)
res2 := findPowerOfTwo(cap2)
res3 := findPowerOfTwo(cap3)
res4 := findPowerOfTwo(cap4)
res5 := findPowerOfTwo(cap5)
// then
c.Assert(res1, Equals, uint64(0))
c.Assert(res2, Equals, uint64(16))
c.Assert(res3, Equals, uint64(16))
c.Assert(res4, Equals, uint64(64))
c.Assert(res5, Equals, uint64(0))
}
var bufferSet = []BufferType{NodeBased, Classical}
func (s *MySuite) TestOfferAndPollSuccess(c *C) {
for _, t := range bufferSet {
// given
fakeString := "fake"
buffer := New(t, 10)
// when
result := buffer.Offer(&fakeString)
poll, _ := buffer.Poll()
// then
c.Assert(result, Equals, true)
c.Assert(poll, Equals, &fakeString)
}
}
func (s *MySuite) TestOfferFailedWhenFull(c *C) {
for _, t := range bufferSet {
// given
capacity := 10
buffer := New(t, uint64(capacity))
realCapacity := findPowerOfTwo(uint64(capacity + 1))
for i := 0; i < int(realCapacity); i++ {
buffer.Offer(i)
}
// when
offered := buffer.Offer(10)
// then
c.Assert(offered, Equals, false)
}
}
func (s *MySuite) TestPollFailedWhenEmpty(c *C) {
for _, t := range bufferSet {
// given
capacity := 10
buffer := New(t, uint64(capacity))
// when
_, success := buffer.Poll()
// then
c.Assert(success, Equals, false)
}
}
func (s *MySuite) TestRingBufferShift(c *C) {
for _, t := range bufferSet {
// given
capacity := 10
buffer := New(t, uint64(capacity))
// when
for i := 0; i < 13; i++ {
buffer.Offer(i)
}
// when
buffer.Offer(13)
buffer.Offer(14)
// then
polled, success := buffer.Poll()
c.Assert(success, Equals, true)
c.Assert(polled, Equals, 0)
// when
buffer.Offer(15)
// then
for i := 0; i < 14; i++ {
polled, success := buffer.Poll()
c.Assert(success, Equals, true)
c.Assert(polled, Equals, i+1)
}
// when
buffer.Offer(16)
buffer.Offer(17)
buffer.Offer(18)
// then
polled1, _ := buffer.Poll()
c.Assert(polled1, Equals, 15)
polled2, _ := buffer.Poll()
c.Assert(polled2, Equals, 16)
}
}
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