fn test_repeat() {
r1 := `V`
r2 := `👋`
assert r1.repeat(5) == 'VVVVV'
assert r2.repeat(5) == '👋👋👋👋👋'
assert r1.repeat(1) == r1.str()
assert r2.repeat(1) == r2.str()
assert r1.repeat(0) == ''
assert r2.repeat(0) == ''
}