test(core): add unit tests for merge trait

crates/core/tests/test_merge.rs

@@ -0,0 +1,119 @@
+use std::collections::{BTreeMap, BTreeSet};
+
+use bdk_core::Merge;
+
+#[test]
+fn test_btree_map_merge() {
+    let mut map1: BTreeMap<i32, &str> = BTreeMap::new();
+    map1.insert(1, "a");
+    let mut map2: BTreeMap<i32, &str> = BTreeMap::new();
+    map2.insert(2, "b");
+
+    map1.merge(map2);
+
+    let expected: BTreeMap<i32, &str> = BTreeMap::from([(1, "a"), (2, "b")]);
+    assert_eq!(map1, expected);
+}
+
+#[test]
+fn test_btree_set_merge() {
+    let mut set1: BTreeSet<i32> = BTreeSet::new();
+    set1.insert(1);
+    let mut set2: BTreeSet<i32> = BTreeSet::new();
+    set2.insert(2);
+
+    set1.merge(set2);
+
+    let expected: BTreeSet<i32> = BTreeSet::from([1, 2]);
+    assert_eq!(set1, expected);
+}
+
+#[test]
+fn test_vec_merge() {
+    let mut vec1 = vec![1, 2, 3];
+    let vec2 = vec![4, 5, 6];
+
+    vec1.merge(vec2);
+
+    assert_eq!(vec1, vec![1, 2, 3, 4, 5, 6]);
+}
+
+#[test]
+fn test_tuple_merge() {
+    let mut tuple1 = (vec![1, 2], BTreeSet::from([3]));
+    let tuple2 = (vec![3, 4], BTreeSet::from([4]));
+
+    tuple1.merge(tuple2);
+
+    let expected_vec = vec![1, 2, 3, 4];
+    assert_eq!(tuple1.0, expected_vec);
+    let expected_set: BTreeSet<i32> = BTreeSet::from([3, 4]);
+    assert_eq!(tuple1.1, expected_set);
+}
+
+#[test]
+fn test_is_empty() {
+    let map: BTreeMap<i32, i32> = BTreeMap::new();
+    assert!(Merge::is_empty(&map));
+
+    let set: BTreeSet<i32> = BTreeSet::new();
+    assert!(Merge::is_empty(&set));
+
+    let vec: Vec<i32> = Vec::new();
+    assert!(Merge::is_empty(&vec));
+}
+#[test]
+fn test_take() {
+    let mut map: BTreeMap<i32, i32> = BTreeMap::new();
+    map.insert(1, 1);
+    let taken_map = Merge::take(&mut map);
+    assert_eq!(taken_map, Some(BTreeMap::from([(1, 1)])));
+    assert!(map.is_empty());
+
+    let mut set: BTreeSet<i32> = BTreeSet::new();
+    set.insert(1);
+    let taken_set = Merge::take(&mut set);
+    assert_eq!(taken_set, Some(BTreeSet::from([1])));
+    assert!(set.is_empty());
+
+    let mut vec: Vec<i32> = vec![1];
+    let taken_vec = Merge::take(&mut vec);
+    assert_eq!(taken_vec, Some(vec![1]));
+    assert!(vec.is_empty());
+}
+
+#[test]
+fn test_btree_map_merge_conflict() {
+    let mut map1: BTreeMap<i32, &str> = BTreeMap::new();
+    map1.insert(1, "a");
+    let mut map2: BTreeMap<i32, &str> = BTreeMap::new();
+    map2.insert(1, "b");
+
+    map1.merge(map2);
+
+    let expected: BTreeMap<i32, &str> = BTreeMap::from([(1, "b")]);
+    assert_eq!(map1, expected);
+}
+
+#[test]
+fn test_btree_set_merge_conflict() {
+    let mut set1: BTreeSet<i32> = BTreeSet::new();
+    set1.insert(1);
+    let mut set2: BTreeSet<i32> = BTreeSet::new();
+    set2.insert(1);
+
+    set1.merge(set2);
+
+    let expected: BTreeSet<i32> = BTreeSet::from([1]);
+    assert_eq!(set1, expected);
+}
+
+#[test]
+fn test_vec_merge_duplicates() {
+    let mut vec1 = vec![1, 2, 3];
+    let vec2 = vec![3, 4, 5];
+
+    vec1.merge(vec2);
+
+    assert_eq!(vec1, vec![1, 2, 3, 3, 4, 5]);
+}