22 lines
423 B
Go
22 lines
423 B
Go
package utils
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import (
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"testing"
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)
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func TestPreviousPowerOfTwo(t *testing.T) {
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loopPath := func(x uint64) int {
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//find closest low power of two
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var cnt uint64
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for cnt = 1; cnt <= x; cnt <<= 1 {
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}
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cnt >>= 1
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return int(cnt)
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}
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for i := uint64(1); i < 65536; i++ {
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if PreviousPowerOfTwo(i) != loopPath(i) {
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t.Fatalf("expected %d, got %d for iteration %d", loopPath(i), PreviousPowerOfTwo(i), i)
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}
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}
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}
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