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package math
import (
gmath "math"
"testing"
)
type operation byte
const (
sub operation = iota
add
mul
)
func TestOverflow(t *testing.T) {
for i, test := range []struct {
x uint64
y uint64
overflow bool
op operation
}{
// add operations
{gmath.MaxUint64, 1, true, add},
{gmath.MaxUint64 - 1, 1, false, add},
// sub operations
{0, 1, true, sub},
{0, 0, false, sub},
// mul operations
{10, 10, false, mul},
{gmath.MaxUint64, 2, true, mul},
{gmath.MaxUint64, 1, false, mul},
} {
var overflows bool
switch test.op {
case sub:
_, overflows = SafeSub(test.x, test.y)
case add:
_, overflows = SafeAdd(test.x, test.y)
case mul:
_, overflows = SafeMul(test.x, test.y)
}
if test.overflow != overflows {
t.Errorf("%d failed. Expected test to be %v, got %v", i, test.overflow, overflows)
}
}
}
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