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dag_walk: add a few more tests for topo_order_reverse(), extract callbacks

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I'm going to add an iterator version which can load linear part of the
operation history lazily.
This commit is contained in:
Yuya Nishihara 2023-06-09 23:01:08 +09:00
parent 459e9174ad
commit d9c417dcb8
1 changed files with 94 additions and 12 deletions
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106
lib/src/dag_walk.rs
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@ -196,6 +196,8 @@ where
#[cfg(test)]
mod tests {
use std::panic;
use maplit::{hashmap, hashset};
use super::*;
@ -212,10 +214,14 @@ mod tests {
'B' => vec!['A'],
'C' => vec!['B'],
};
let id_fn = |node: &char| *node;
let neighbors_fn = |node: &char| neighbors[node].clone();
let common =
topo_order_reverse(vec!['C'], |node| *node, move |node| neighbors[node].clone());
let common = topo_order_reverse(vec!['C'], id_fn, neighbors_fn);
assert_eq!(common, vec!['C', 'B', 'A']);
let common = topo_order_reverse(vec!['C', 'B'], id_fn, neighbors_fn);
assert_eq!(common, vec!['C', 'B', 'A']);
let common = topo_order_reverse(vec!['B', 'C'], id_fn, neighbors_fn);
assert_eq!(common, vec!['C', 'B', 'A']);
}
@ -239,11 +245,49 @@ mod tests {
'E' => vec!['A'],
'F' => vec!['E', 'D'],
};
let id_fn = |node: &char| *node;
let neighbors_fn = |node: &char| neighbors[node].clone();
let common =
topo_order_reverse(vec!['F'], |node| *node, move |node| neighbors[node].clone());
let common = topo_order_reverse(vec!['F'], id_fn, neighbors_fn);
assert_eq!(common, vec!['F', 'E', 'D', 'C', 'B', 'A']);
let common = topo_order_reverse(vec!['F', 'E', 'C'], id_fn, neighbors_fn);
assert_eq!(common, vec!['F', 'D', 'E', 'C', 'B', 'A']);
let common = topo_order_reverse(vec!['F', 'D', 'E'], id_fn, neighbors_fn);
assert_eq!(common, vec!['F', 'D', 'C', 'B', 'E', 'A']);
}
#[test]
fn test_topo_order_reverse_nested_merges() {
// This graph:
// o I
// |\
// | o H
// | |\
// | | o G
// | o | F
// | | o E
// o |/ D
// | o C
// o | B
// |/
// o A
let neighbors = hashmap! {
'A' => vec![],
'B' => vec!['A'],
'C' => vec!['A'],
'D' => vec!['B'],
'E' => vec!['C'],
'F' => vec!['C'],
'G' => vec!['E'],
'H' => vec!['F', 'G'],
'I' => vec!['D', 'H'],
};
let id_fn = |node: &char| *node;
let neighbors_fn = |node: &char| neighbors[node].clone();
let common = topo_order_reverse(vec!['I'], id_fn, neighbors_fn);
assert_eq!(common, vec!['I', 'D', 'B', 'H', 'F', 'G', 'E', 'C', 'A']);
}
#[test]
@ -268,16 +312,54 @@ mod tests {
'E' => vec!['A'],
'F' => vec!['E', 'D'],
};
let id_fn = |node: &char| *node;
let neighbors_fn = |node: &char| neighbors[node].clone();
let common = topo_order_reverse(
vec!['F', 'C'],
|node| *node,
move |node| neighbors[node].clone(),
);
let common = topo_order_reverse(vec!['F', 'C'], id_fn, neighbors_fn);
assert_eq!(common, vec!['F', 'E', 'D', 'C', 'B', 'A']);
}
#[test]
fn test_topo_order_reverse_multiple_roots() {
// This graph:
// o D
// | \
// o | C
// o B
// o A
let neighbors = hashmap! {
'A' => vec![],
'B' => vec!['A'],
'C' => vec![],
'D' => vec!['C', 'B'],
};
let id_fn = |node: &char| *node;
let neighbors_fn = |node: &char| neighbors[node].clone();
let common = topo_order_reverse(vec!['D'], id_fn, neighbors_fn);
assert_eq!(common, vec!['D', 'C', 'B', 'A']);
}
#[test]
fn test_topo_order_reverse_cycle_linear() {
// This graph:
// o C
// o B
// o A (to C)
let neighbors = hashmap! {
'A' => vec!['C'],
'B' => vec!['A'],
'C' => vec!['B'],
};
let id_fn = |node: &char| *node;
let neighbors_fn = |node: &char| neighbors[node].clone();
let result = panic::catch_unwind(|| topo_order_reverse(vec!['C'], id_fn, neighbors_fn));
assert!(result.is_err());
}
#[test]
fn test_closest_common_node_tricky() {
// Test this case where A is the shortest distance away, but we still want the