Increase test coverage
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This commit is contained in:
Timothy Warren 2020-03-13 16:31:37 -04:00
parent f8b91531b9
commit e9b125aa7a

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@ -2,11 +2,12 @@
//! \[WIP\] Arbitrarily large integers
use crate::num::Sign::*;
use crate::num::*;
use core::convert::TryInto;
use core::mem::replace;
use core::ops::{
Add, AddAssign, Div, DivAssign, Mul, MulAssign, Neg, Not, Rem, RemAssign, Sub, SubAssign,
};
use core::usize;
use std::convert::TryInto;
#[derive(Clone, Debug, PartialEq)]
pub struct BigInt {
@ -242,7 +243,7 @@ impl Mul for BigInt {
}
}
out.trim_zeros();
out.shrink_to_fit();
out
}
@ -266,31 +267,36 @@ impl Rem for BigInt {
impl AddAssign for BigInt {
fn add_assign(&mut self, rhs: Self) {
*self = self.clone() + rhs;
let this = replace(self, BigInt::new());
*self = this + rhs;
}
}
impl SubAssign for BigInt {
fn sub_assign(&mut self, rhs: Self) {
*self = self.clone() - rhs;
let this = replace(self, BigInt::new());
*self = this - rhs;
}
}
impl MulAssign for BigInt {
fn mul_assign(&mut self, rhs: Self) {
*self = self.clone() * rhs;
let this = replace(self, BigInt::new());
*self = this * rhs;
}
}
impl DivAssign for BigInt {
fn div_assign(&mut self, rhs: Self) {
*self = self.clone() / rhs;
let this = replace(self, BigInt::new());
*self = this / rhs;
}
}
impl RemAssign for BigInt {
fn rem_assign(&mut self, rhs: Self) {
*self = self.clone() % rhs;
let this = replace(self, BigInt::new());
*self = this % rhs;
}
}
@ -445,6 +451,21 @@ mod tests {
assert_eq!(sum.inner[1], 1usize);
}
#[test]
fn test_add_assign() {
let mut a = BigInt::from(core::usize::MAX);
let b = BigInt::from(core::usize::MAX);
a += b;
assert_eq!(
a.inner[0],
core::usize::MAX - 1,
"least significant place should be MAX - 1"
);
assert_eq!(a.inner[1], 1usize, "most significant place should be 1");
}
#[test]
fn test_sub() {
let a = BigInt::from(core::usize::MAX);
@ -484,6 +505,69 @@ mod tests {
assert_eq!(a.inner, vec![core::usize::MAX, core::usize::MAX]);
}
#[test]
fn test_mul() {
let a = BigInt::from(65536);
let b = BigInt::from(4);
let product = a * b;
assert_eq!(product.inner[0], 65536usize * 4);
}
#[test]
#[should_panic]
fn test_mul_overflow() {
let a = BigInt::from(core::usize::MAX);
let b = BigInt::from(5);
let product = a * b;
}
#[test]
#[should_panic]
fn test_mul_assign_overflow() {
let mut a = BigInt::from(core::usize::MAX);
let b = BigInt::from(5);
a *= b;
}
#[test]
#[should_panic]
fn test_div() {
let a = BigInt::from(128);
let b = BigInt::from(32);
let quotient = a / b;
}
#[test]
#[should_panic]
fn test_div_assign() {
let mut a = BigInt::from(128);
let b = BigInt::from(32);
a /= b;
}
#[test]
#[should_panic]
fn test_rem() {
let a = BigInt::from(5);
let b = BigInt::from(2);
let rem = a % b;
}
#[test]
#[should_panic]
fn test_rem_assign() {
let mut a = BigInt::from(5);
let b = BigInt::from(2);
a %= b;
}
#[test]
fn test_zeros() {
let a = BigInt::new();
@ -506,21 +590,6 @@ mod tests {
assert_eq!(b.inner[0], core::usize::MAX);
}
#[test]
fn test_add_assign() {
let mut a = BigInt::from(core::usize::MAX);
let b = BigInt::from(core::usize::MAX);
a += b;
assert_eq!(
a.inner[0],
core::usize::MAX - 1,
"least significant place should be MAX - 1"
);
assert_eq!(a.inner[1], 1usize, "most significant place should be 1");
}
#[test]
fn test_from() {
// Signed numbers
@ -529,4 +598,16 @@ mod tests {
// Larger than usize
assert_eq!(BigInt::from(45u128), BigInt::from(45usize));
}
#[test]
#[should_panic]
fn test_from_large_unsigned() {
BigInt::from(core::u128::MAX);
}
#[test]
#[should_panic]
fn test_from_large_signed() {
BigInt::from(128i128);
}
}