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/*
* util_test.go - Tests the util package
*
* Copyright 2017 Google Inc.
* Author: Joe Richey (joerichey@google.com)
*
* 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 util
import (
"bytes"
"testing"
"unsafe"
)
const offset = 3
var (
byteArr = []byte{'a', 'b', 'c', 'd'}
ptrArr = []*int{&a, &b, &c, &d}
a = 1
b = 2
c = 3
d = 4
)
// Make sure the address behaves well under slicing
func TestPtrOffset(t *testing.T) {
i1 := uintptr(Ptr(byteArr[offset:]))
i2 := uintptr(Ptr(byteArr))
if i1 != i2+offset {
t.Errorf("pointers %v and %v do not have an offset of %v", i1, i2, offset)
}
}
// Tests that the ByteSlice method essentially reverses the Ptr method
func TestByteSlice(t *testing.T) {
ptr := Ptr(byteArr)
generatedArr := ByteSlice(ptr)[:len(byteArr)]
if !bytes.Equal(byteArr, generatedArr) {
t.Errorf("generated array (%v) and original array (%v) do not agree",
generatedArr, byteArr)
}
}
// Tests that the PointerSlice method correctly handles Go Pointers
func TestPointerSlice(t *testing.T) {
arrPtr := unsafe.Pointer(&ptrArr[0])
// Convert an array of unsafe pointers to int pointers.
for i, ptr := range PointerSlice(arrPtr)[:len(ptrArr)] {
if ptrArr[i] != (*int)(ptr) {
t.Errorf("generated array and original array disagree at %d", i)
}
}
}
// Make sure NeverError actually panics
func TestNeverErrorPanic(t *testing.T) {
defer func() {
if r := recover(); r == nil {
t.Errorf("NeverError did not panic")
}
}()
err := SystemError("Hello")
NeverError(err)
}
// Make sure NeverError doesn't panic on nil
func TestNeverErrorNoPanic(t *testing.T) {
defer func() {
if r := recover(); r != nil {
t.Errorf("NeverError panicked")
}
}()
NeverError(nil)
}
func TestIsKernelVersionAtLeast(t *testing.T) {
// Even just running Go requires at least v2.6.23, so...
if !IsKernelVersionAtLeast(2, 6) {
t.Error("IsKernelVersionAtLeast() is broken")
}
}
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