Add compute_patch tests for adding/removing children

src/snapshot/tests/compute.rs

@@ -89,6 +89,74 @@ fn remove_property() {
     assert_yaml_snapshot!(patch_value);
 }
 
+#[test]
+fn add_child() {
+    let mut redactions = RedactionMap::new();
+
+    let tree = empty_tree();
+    redactions.intern(tree.get_root_id());
+
+    let snapshot = InstanceSnapshot {
+        snapshot_id: None,
+        metadata: Default::default(),
+        name: Cow::Borrowed("ROOT"),
+        class_name: Cow::Borrowed("ROOT"),
+        properties: Default::default(),
+        children: vec![InstanceSnapshot {
+            snapshot_id: None,
+            metadata: Default::default(),
+            name: Cow::Borrowed("New"),
+            class_name: Cow::Borrowed("Folder"),
+            properties: Default::default(),
+            children: Vec::new(),
+        }],
+    };
+
+    let patch_set = compute_patch_set(&snapshot, &tree, tree.get_root_id());
+    let patch_value = redactions.redacted_yaml(patch_set);
+
+    assert_yaml_snapshot!(patch_value);
+}
+
+#[test]
+fn remove_child() {
+    let mut redactions = RedactionMap::new();
+
+    let mut tree = empty_tree();
+    redactions.intern(tree.get_root_id());
+
+    {
+        let root_id = tree.get_root_id();
+        let new_id = tree.insert_instance(
+            InstancePropertiesWithMeta {
+                properties: RbxInstanceProperties {
+                    name: "Should not appear in snapshot".to_owned(),
+                    class_name: "Folder".to_owned(),
+                    properties: Default::default(),
+                },
+                metadata: Default::default(),
+            },
+            root_id,
+        );
+
+        redactions.intern(new_id);
+    }
+
+    let snapshot = InstanceSnapshot {
+        snapshot_id: None,
+        metadata: Default::default(),
+        name: Cow::Borrowed("ROOT"),
+        class_name: Cow::Borrowed("ROOT"),
+        properties: Default::default(),
+        children: Vec::new(),
+    };
+
+    let patch_set = compute_patch_set(&snapshot, &tree, tree.get_root_id());
+    let patch_value = redactions.redacted_yaml(patch_set);
+
+    assert_yaml_snapshot!(patch_value);
+}
+
 fn empty_tree() -> RojoTree {
     RojoTree::new(InstancePropertiesWithMeta {
         properties: RbxInstanceProperties {