Improve test consistency

export_test.go

@@ -51,3 +51,7 @@ func DisableAssertions() {
 func Fastrand() uint32 {
 	return fastrand()
 }
+
+func NextPowOf2(v uint32) uint32 {
+	return nextPowOf2(v)
+}

util_test.go

@@ -1,31 +1,35 @@
-package xsync
+package xsync_test
 
 import (
 	"math/rand"
 	"testing"
+
+	. "github.com/puzpuzpuz/xsync/v2"
 )
 
 func TestNextPowOf2(t *testing.T) {
-	if nextPowOf2(0) != 1 {
+	if NextPowOf2(0) != 1 {
 		t.Error("nextPowOf2 failed")
 	}
-	if nextPowOf2(1) != 1 {
+	if NextPowOf2(1) != 1 {
 		t.Error("nextPowOf2 failed")
 	}
-	if nextPowOf2(2) != 2 {
+	if NextPowOf2(2) != 2 {
 		t.Error("nextPowOf2 failed")
 	}
-	if nextPowOf2(3) != 4 {
+	if NextPowOf2(3) != 4 {
 		t.Error("nextPowOf2 failed")
 	}
 }
 
+// This test is here to catch potential problems
+// with fastrand-related changes.
 func TestFastrand(t *testing.T) {
 	count := 10000
 	set := make(map[uint32]struct{}, count)
 
 	for i := 0; i < count; i++ {
-		num := fastrand()
+		num := Fastrand()
 		set[num] = struct{}{}
 	}
 
@@ -36,14 +40,14 @@ func TestFastrand(t *testing.T) {
 
 func BenchmarkFastrand(b *testing.B) {
 	for i := 0; i < b.N; i++ {
-		_ = fastrand()
+		_ = Fastrand()
 	}
-	// about 1.5 ns/op
+	// about 1.4 ns/op on x86-64
 }
 
 func BenchmarkRand(b *testing.B) {
 	for i := 0; i < b.N; i++ {
 		_ = rand.Uint32()
 	}
-	// about 12 ns/op
+	// about 12 ns/op on x86-64
 }