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/*
Copyright 2014 The Kubernetes Authors All rights reserved.
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 resource
import (
"testing"
)
func TestDetectOverflowAdd(t *testing.T) {
for _, test := range []struct {
a, b int64
c int64
ok bool
}{
{0, 0, 0, true},
{-1, 1, 0, true},
{0, 1, 1, true},
{2, 2, 4, true},
{2, -2, 0, true},
{-2, -2, -4, true},
{mostNegative, -1, 0, false},
{mostNegative, 1, mostNegative + 1, true},
{mostPositive, -1, mostPositive - 1, true},
{mostPositive, 1, 0, false},
{mostNegative, mostPositive, -1, true},
{mostPositive, mostNegative, -1, true},
{mostPositive, mostPositive, 0, false},
{mostNegative, mostNegative, 0, false},
{-mostPositive, mostNegative, 0, false},
{mostNegative, -mostPositive, 0, false},
{-mostPositive, -mostPositive, 0, false},
} {
c, ok := int64Add(test.a, test.b)
if c != test.c {
t.Errorf("%v: unexpected result: %d", test, c)
}
if ok != test.ok {
t.Errorf("%v: unexpected overflow: %t", test, ok)
}
// addition is commutative
d, ok2 := int64Add(test.b, test.a)
if c != d || ok != ok2 {
t.Errorf("%v: not commutative: %d %t", test, d, ok2)
}
}
}
func TestDetectOverflowMultiply(t *testing.T) {
for _, test := range []struct {
a, b int64
c int64
ok bool
}{
{0, 0, 0, true},
{-1, 1, -1, true},
{-1, -1, 1, true},
{1, 1, 1, true},
{0, 1, 0, true},
{1, 0, 0, true},
{2, 2, 4, true},
{2, -2, -4, true},
{-2, -2, 4, true},
{mostNegative, -1, 0, false},
{mostNegative, 1, mostNegative, true},
{mostPositive, -1, -mostPositive, true},
{mostPositive, 1, mostPositive, true},
{mostNegative, mostPositive, 0, false},
{mostPositive, mostNegative, 0, false},
{mostPositive, mostPositive, 1, false},
{mostNegative, mostNegative, 0, false},
{-mostPositive, mostNegative, 0, false},
{mostNegative, -mostPositive, 0, false},
{-mostPositive, -mostPositive, 1, false},
} {
c, ok := int64Multiply(test.a, test.b)
if c != test.c {
t.Errorf("%v: unexpected result: %d", test, c)
}
if ok != test.ok {
t.Errorf("%v: unexpected overflow: %t", test, ok)
}
// multiplication is commutative
d, ok2 := int64Multiply(test.b, test.a)
if c != d || ok != ok2 {
t.Errorf("%v: not commutative: %d %t", test, d, ok2)
}
}
}
func TestDetectOverflowScale(t *testing.T) {
for _, a := range []int64{0, -1, 1, 10, -10, mostPositive, mostNegative, -mostPositive} {
for _, b := range []int64{1, 2, 10, 100, 1000, mostPositive} {
expect, expectOk := int64Multiply(a, b)
c, ok := int64MultiplyScale(a, b)
if c != expect {
t.Errorf("%d*%d: unexpected result: %d", a, b, c)
}
if ok != expectOk {
t.Errorf("%d*%d: unexpected overflow: %t", a, b, ok)
}
}
for _, test := range []struct {
base int64
fn func(a int64) (int64, bool)
}{
{10, int64MultiplyScale10},
{100, int64MultiplyScale100},
{1000, int64MultiplyScale1000},
} {
expect, expectOk := int64Multiply(a, test.base)
c, ok := test.fn(a)
if c != expect {
t.Errorf("%d*%d: unexpected result: %d", a, test.base, c)
}
if ok != expectOk {
t.Errorf("%d*%d: unexpected overflow: %t", a, test.base, ok)
}
}
}
}
func TestRemoveInt64Factors(t *testing.T) {
for _, test := range []struct {
value int64
max int64
result int64
scale int32
}{
{100, 10, 1, 2},
{100, 10, 1, 2},
{100, 100, 1, 1},
{1, 10, 1, 0},
} {
r, s := removeInt64Factors(test.value, test.max)
if r != test.result {
t.Errorf("%v: unexpected result: %d", test, r)
}
if s != test.scale {
t.Errorf("%v: unexpected scale: %d", test, s)
}
}
}
func TestNegativeScaleInt64(t *testing.T) {
for _, test := range []struct {
base int64
scale Scale
result int64
exact bool
}{
{1234567, 0, 1234567, true},
{1234567, 1, 123457, false},
{1234567, 2, 12346, false},
{1234567, 3, 1235, false},
{1234567, 4, 124, false},
{-1234567, 0, -1234567, true},
{-1234567, 1, -123457, false},
{-1234567, 2, -12346, false},
{-1234567, 3, -1235, false},
{-1234567, 4, -124, false},
{1000, 0, 1000, true},
{1000, 1, 100, true},
{1000, 2, 10, true},
{1000, 3, 1, true},
{1000, 4, 1, false},
{-1000, 0, -1000, true},
{-1000, 1, -100, true},
{-1000, 2, -10, true},
{-1000, 3, -1, true},
{-1000, 4, -1, false},
{0, 0, 0, true},
{0, 1, 0, true},
{0, 2, 0, true},
// negative scale is undefined behavior
{1000, -1, 1000, true},
} {
result, exact := negativeScaleInt64(test.base, test.scale)
if result != test.result {
t.Errorf("%v: unexpected result: %d", test, result)
}
if exact != test.exact {
t.Errorf("%v: unexpected exact: %t", test, exact)
}
}
}
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