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bounded_test.go
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// Copyright 2017 Kristian Bolino
//
// Licensed 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 exec_test
import (
"sync/atomic"
"testing"
"time"
"github.com/kbolino/go-exec"
. "github.com/smartystreets/goconvey/convey"
)
func TestBounded_Do(t *testing.T) {
Convey("Bounded.Do limits the number of running goroutines", t, func() {
counter := int32(0)
bounded := exec.NewBounded(2)
go func() {
for i := 0; i < 3; i++ {
bounded.Do(func() {
atomic.AddInt32(&counter, 1)
time.Sleep(50 * time.Millisecond)
})
}
}()
time.Sleep(10 * time.Millisecond)
So(atomic.LoadInt32(&counter), ShouldEqual, 2)
time.Sleep(100 * time.Millisecond)
So(atomic.LoadInt32(&counter), ShouldEqual, 3)
})
}
func TestBounded_Try(t *testing.T) {
Convey("Bounded.Try doesn't block", t, func() {
counter := int32(0)
bounded := exec.NewBounded(2)
tries := []bool{}
go func() {
for i := 0; i < 3; i++ {
try := bounded.Try(func() {
atomic.AddInt32(&counter, 1)
time.Sleep(50 * time.Millisecond)
})
tries = append(tries, try)
}
}()
time.Sleep(10 * time.Millisecond)
So(atomic.LoadInt32(&counter), ShouldEqual, 2)
time.Sleep(100 * time.Millisecond)
So(atomic.LoadInt32(&counter), ShouldEqual, 2)
So(tries, ShouldResemble, []bool{true, true, false})
})
}
func TestBounded_TryUntil(t *testing.T) {
Convey("Bounded.TryUntil blocks until timeout is reached", t, func() {
counter := int32(0)
bounded := exec.NewBounded(1)
tries := []bool{}
go func() {
for i := 0; i < 3; i++ {
n := i + 1
try := bounded.TryUntil(50*time.Millisecond, func() {
atomic.AddInt32(&counter, 1)
ms := 25 * time.Duration(n)
time.Sleep(ms * time.Millisecond)
})
tries = append(tries, try)
}
}()
time.Sleep(10 * time.Millisecond)
So(atomic.LoadInt32(&counter), ShouldEqual, 1)
time.Sleep(100 * time.Millisecond)
So(atomic.LoadInt32(&counter), ShouldEqual, 2)
So(tries, ShouldResemble, []bool{true, true, false})
})
}
func TestBounded_Wait(t *testing.T) {
Convey("Bounded.Wait blocks until all goroutines are done", t, func() {
counter := int32(0)
bounded := exec.NewBounded(2)
go func() {
for i := 0; i < 3; i++ {
bounded.Do(func() {
time.Sleep(50 * time.Millisecond)
atomic.AddInt32(&counter, 1)
})
}
}()
time.Sleep(10 * time.Millisecond)
bounded.Wait()
So(atomic.LoadInt32(&counter), ShouldEqual, 3)
})
}
func TestNewBounded(t *testing.T) {
cases := []struct {
desc string
n int
panics bool
}{
{"panics when n < 0", -1, true},
{"panics when n == 0", 0, true},
{"does not panic when n > 0", 1, false},
}
Convey("NewBounded", t, func() {
for _, c := range cases {
Convey(c.desc, func() {
var bounded *exec.Bounded
f := func() {
bounded = exec.NewBounded(c.n)
}
if c.panics {
So(f, ShouldPanic)
} else {
So(f, ShouldNotPanic)
So(bounded, ShouldNotBeNil)
}
})
}
})
}