forked from DamnWidget/goqueue
/
queue_test.go
152 lines (129 loc) · 3.83 KB
/
queue_test.go
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/*
Copyright (C) 2014 Oscar Campos <oscar.campos@member.fsf.org>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
See LICENSE file for more details.
*/
package goqueue_test
import (
"runtime"
queue "github.com/DamnWidget/goqueue"
)
var _ = Describe("Queue", func() {
runtime.GOMAXPROCS(runtime.NumCPU())
Describe("Call the New function", func() {
Context("With a fixed size", func() {
q := queue.New(10)
It("Should return a pointer to a new Queue of that size", func() {
Expect(q).ToNot(BeNil())
Expect(q.Cap()).To(Equal(int64(10)))
})
})
Context("With non size", func() {
q := queue.New()
It("Should return a pointer to a new Queue of unlimited size", func() {
Expect(q).ToNot(BeNil())
Expect(q.Cap()).To(Equal(int64(-1)))
})
})
})
Describe("Len method", func() {
Describe("Should return the current Queue lenght", func() {
Context("With ten elements", func() {
q := queue.New()
for i := 0; i < 10; i++ {
q.Push(struct{}{})
}
It("Should return ten", func() {
Expect(q.Len()).To(Equal(int64(10)))
})
})
Context("With no elements", func() {
q := queue.New()
It("Should return zero", func() {
Expect(q.Len()).To(BeZero())
})
})
})
})
Describe("Push method", func() {
Context("Push a new element at the end of the queue", func() {
q := queue.New()
q.Push(true)
It("Should be a queue of unlimited capacity with one true element", func() {
Expect(q.Cap()).To(Equal(int64(-1)))
Expect(q.Len()).To(Equal(int64(1)))
Expect(q.Pop()).To(BeTrue())
Expect(q.Pop()).To(BeNil())
})
})
Context("Push two elements at the end of the queue is FIFO", func() {
q := queue.New()
q.Push(true)
q.Push(false)
It("Should be an unlimited queue with two elements, first one true", func() {
Expect(q.Cap()).To(Equal(int64(-1)))
Expect(q.Len()).To(Equal(int64(2)))
Expect(q.Pop()).To(BeTrue())
Expect(q.Len()).To(Equal(int64(1)))
})
})
Context("Push beyond limits is not allowed", func() {
q := queue.New(1)
q.Push(1)
err := q.Push(2)
It("Should return an error", func() {
Expect(err).ToNot(BeNil())
})
})
})
Describe("Thread Safety", func() {
Context("Push is thread safe with two or more goroutines", func() {
q := queue.New()
for i := 0; i < 6; i++ {
go func(q *queue.Queue) { q.Push(1) }(q)
}
It("Should be a queue of six element", func() {
Expect(q.Len()).To(Equal(int64(6)))
})
})
Context("Calling push and pop in goroutines is safe", func() {
q := queue.New()
for i := 1; i < 601; i++ {
go func(q *queue.Queue) { q.Push(1) }(q)
}
for i := 0; i < 300; i++ {
go func(q *queue.Queue) { q.Pop() }(q)
}
It("Should be a Queue of three thousand elements", func() {
Expect(q.Len()).To(Equal(int64(300)))
})
})
})
Describe("Values returns the whole Queue values", func() {
q := queue.New()
for i := 1; i < 6; i++ {
q.Push(i * i)
}
It("Shouldn't mute the Queue", func() {
v := q.Values()
Expect(v).To(Equal([]interface{}{1, 4, 9, 16, 25}))
Expect(q.Len()).To(Equal(int64(5)))
})
Context("If the Queue is empty", func() {
q := queue.New()
It("Returns just empty slice", func() {
v := q.Values()
Expect(v).To(Equal([]interface{}{}))
})
})
})
})