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use itertools::EitherOrBoth;
use itertools::free::merge_join_by;
#[test]
fn empty() {
let left: Vec<u32> = vec![];
let right: Vec<u32> = vec![];
let expected_result: Vec<EitherOrBoth<u32, u32>> = vec![];
let actual_result = merge_join_by(left, right, |l, r| l.cmp(r))
.collect::<Vec<_>>();
assert_eq!(expected_result, actual_result);
}
#[test]
fn left_only() {
let left: Vec<u32> = vec![1,2,3];
let right: Vec<u32> = vec![];
let expected_result: Vec<EitherOrBoth<u32, u32>> = vec![
EitherOrBoth::Left(1),
EitherOrBoth::Left(2),
EitherOrBoth::Left(3)
];
let actual_result = merge_join_by(left, right, |l, r| l.cmp(r))
.collect::<Vec<_>>();
assert_eq!(expected_result, actual_result);
}
#[test]
fn right_only() {
let left: Vec<u32> = vec![];
let right: Vec<u32> = vec![1,2,3];
let expected_result: Vec<EitherOrBoth<u32, u32>> = vec![
EitherOrBoth::Right(1),
EitherOrBoth::Right(2),
EitherOrBoth::Right(3)
];
let actual_result = merge_join_by(left, right, |l, r| l.cmp(r))
.collect::<Vec<_>>();
assert_eq!(expected_result, actual_result);
}
#[test]
fn first_left_then_right() {
let left: Vec<u32> = vec![1,2,3];
let right: Vec<u32> = vec![4,5,6];
let expected_result: Vec<EitherOrBoth<u32, u32>> = vec![
EitherOrBoth::Left(1),
EitherOrBoth::Left(2),
EitherOrBoth::Left(3),
EitherOrBoth::Right(4),
EitherOrBoth::Right(5),
EitherOrBoth::Right(6)
];
let actual_result = merge_join_by(left, right, |l, r| l.cmp(r))
.collect::<Vec<_>>();
assert_eq!(expected_result, actual_result);
}
#[test]
fn first_right_then_left() {
let left: Vec<u32> = vec![4,5,6];
let right: Vec<u32> = vec![1,2,3];
let expected_result: Vec<EitherOrBoth<u32, u32>> = vec![
EitherOrBoth::Right(1),
EitherOrBoth::Right(2),
EitherOrBoth::Right(3),
EitherOrBoth::Left(4),
EitherOrBoth::Left(5),
EitherOrBoth::Left(6)
];
let actual_result = merge_join_by(left, right, |l, r| l.cmp(r))
.collect::<Vec<_>>();
assert_eq!(expected_result, actual_result);
}
#[test]
fn interspersed_left_and_right() {
let left: Vec<u32> = vec![1,3,5];
let right: Vec<u32> = vec![2,4,6];
let expected_result: Vec<EitherOrBoth<u32, u32>> = vec![
EitherOrBoth::Left(1),
EitherOrBoth::Right(2),
EitherOrBoth::Left(3),
EitherOrBoth::Right(4),
EitherOrBoth::Left(5),
EitherOrBoth::Right(6)
];
let actual_result = merge_join_by(left, right, |l, r| l.cmp(r))
.collect::<Vec<_>>();
assert_eq!(expected_result, actual_result);
}
#[test]
fn overlapping_left_and_right() {
let left: Vec<u32> = vec![1,3,4,6];
let right: Vec<u32> = vec![2,3,4,5];
let expected_result: Vec<EitherOrBoth<u32, u32>> = vec![
EitherOrBoth::Left(1),
EitherOrBoth::Right(2),
EitherOrBoth::Both(3, 3),
EitherOrBoth::Both(4, 4),
EitherOrBoth::Right(5),
EitherOrBoth::Left(6)
];
let actual_result = merge_join_by(left, right, |l, r| l.cmp(r))
.collect::<Vec<_>>();
assert_eq!(expected_result, actual_result);
}