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package sexp
import (
"bufio"
"bytes"
"math/big"
"testing"
)
func Test_BigNum_First_generatesAPanic(t *testing.T) {
defer checkForPanic(t, "not valid to call First on a BigNum")
NewBigNum("ABCD").First()
}
func Test_BigNum_Second_generatesAPanic(t *testing.T) {
defer checkForPanic(t, "not valid to call Second on a BigNum")
NewBigNum("ABCD").Second()
}
func Test_BigNum_String_generatesAValidRepresentation(t *testing.T) {
res := NewBigNum("ABCD").String()
assertEquals(t, res, "#ABCD#")
}
func Test_BigNum_Value_returnsTheBigNumInside(t *testing.T) {
res := NewBigNum("ABCD").Value().(*big.Int)
assertDeepEquals(t, res, new(big.Int).SetBytes([]byte{0xAB, 0xCD}))
}
func Test_ReadBigNum_returnsNilIfAskedToReadNonBigNum(t *testing.T) {
res := ReadBigNum(bufio.NewReader(bytes.NewReader([]byte(""))))
assertEquals(t, res, nil)
}
func Test_ReadBigNum_returnsNilIfAskedToReadBigNumThatDoesntEndCorrectly(t *testing.T) {
res := ReadBigNum(bufio.NewReader(bytes.NewReader([]byte("#ABCD"))))
assertEquals(t, res, nil)
}
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