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Add extra test and benchmark for count bits

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This commit is contained in:
Tom Payne 2021-10-01 17:08:36 +02:00
parent c46d84b991
commit 125312a8cf
1 changed files with 16 additions and 0 deletions
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16
pkg/registry/core/service/allocator/utils_test.go
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@ -22,12 +22,18 @@ import (
) )
func TestCountBits(t *testing.T) { func TestCountBits(t *testing.T) {
// bigN is an integer that occupies more than one big.Word.
bigN, ok := big.NewInt(0).SetString("10000000000000000000000000000000000000000000000000000000000000000", 16)
if !ok {
t.Fatal("Failed to set bigN")
}
tests := []struct { tests := []struct {
n *big.Int n *big.Int
expected int expected int
}{ }{
{n: big.NewInt(int64(0)), expected: 0}, {n: big.NewInt(int64(0)), expected: 0},
{n: big.NewInt(int64(0xffffffffff)), expected: 40}, {n: big.NewInt(int64(0xffffffffff)), expected: 40},
{n: bigN, expected: 1},
} }
for _, test := range tests { for _, test := range tests {
actual := countBits(test.n) actual := countBits(test.n)
@ -36,3 +42,13 @@ func TestCountBits(t *testing.T) {
} }
} }
} }
func BenchmarkCountBits(b *testing.B) {
bigN, ok := big.NewInt(0).SetString("10000000000000000000000000000000000000000000000000000000000000000", 16)
if !ok {
b.Fatal("Failed to set bigN")
}
for i := 0; i < b.N; i++ {
countBits(bigN)
}
}