Multiplication mutation to Division

[kob-h]

I have the following code:

package mutation

type Calculator struct {
}

func (c *Calculator) Multiply(a int, b int) int {
	return a * b
}

package mutation_test

import (
	mutation "awesomeProject"
	"github.com/stretchr/testify/assert"
	"testing"
)

func TestMe(t *testing.T) {
	c := mutation.Calculator{}
	res := c.Multiply(1, 1)
	assert.Equal(t, 1, res)
}

When I run go-mutation I get the results:
The mutation score is 0.000000 (0 passed, 0 failed, 0 duplicated, 0 skipped, total is 0)
While I expected to get a result that shows me that multiplication can be replaced for division for this specific test data.
I believe this is an issue?

Thanks,
Kobi.