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diff --git a/dom/heapsnapshot/tests/unit/test_DominatorTreeNode_insert_01.js b/dom/heapsnapshot/tests/unit/test_DominatorTreeNode_insert_01.js
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+++ b/dom/heapsnapshot/tests/unit/test_DominatorTreeNode_insert_01.js
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+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Test that we can insert new children into an existing DominatorTreeNode tree.
+
+const tree = makeTestDominatorTreeNode({ nodeId: 1000 }, [
+ makeTestDominatorTreeNode({}),
+ makeTestDominatorTreeNode({ nodeId: 2000 }, [
+ makeTestDominatorTreeNode({}),
+ makeTestDominatorTreeNode({ nodeId: 3000 }),
+ makeTestDominatorTreeNode({}),
+ ]),
+ makeTestDominatorTreeNode({}),
+]);
+
+const path = [1000, 2000, 3000];
+
+const newChildren = [
+ makeTestDominatorTreeNode({ parentId: 3000 }),
+ makeTestDominatorTreeNode({ parentId: 3000 }),
+];
+
+const moreChildrenAvailable = false;
+
+const expected = {
+ nodeId: 1000,
+ parentId: undefined,
+ label: undefined,
+ shallowSize: 1,
+ retainedSize: 7,
+ children: [
+ {
+ nodeId: 0,
+ label: undefined,
+ shallowSize: 1,
+ retainedSize: 1,
+ parentId: 1000,
+ moreChildrenAvailable: true,
+ children: undefined,
+ },
+ {
+ nodeId: 2000,
+ label: undefined,
+ shallowSize: 1,
+ retainedSize: 4,
+ parentId: 1000,
+ children: [
+ {
+ nodeId: 1,
+ label: undefined,
+ shallowSize: 1,
+ retainedSize: 1,
+ parentId: 2000,
+ moreChildrenAvailable: true,
+ children: undefined,
+ },
+ {
+ nodeId: 3000,
+ label: undefined,
+ shallowSize: 1,
+ retainedSize: 1,
+ parentId: 2000,
+ children: [
+ {
+ nodeId: 7,
+ parentId: 3000,
+ label: undefined,
+ shallowSize: 1,
+ retainedSize: 1,
+ moreChildrenAvailable: true,
+ children: undefined,
+ },
+ {
+ nodeId: 8,
+ parentId: 3000,
+ label: undefined,
+ shallowSize: 1,
+ retainedSize: 1,
+ moreChildrenAvailable: true,
+ children: undefined,
+ },
+ ],
+ moreChildrenAvailable: false
+ },
+ {
+ nodeId: 3,
+ label: undefined,
+ shallowSize: 1,
+ retainedSize: 1,
+ parentId: 2000,
+ moreChildrenAvailable: true,
+ children: undefined,
+ },
+ ],
+ moreChildrenAvailable: true
+ },
+ {
+ nodeId: 5,
+ label: undefined,
+ shallowSize: 1,
+ retainedSize: 1,
+ parentId: 1000,
+ moreChildrenAvailable: true,
+ children: undefined,
+ }
+ ],
+ moreChildrenAvailable: true
+};
+
+function run_test() {
+ assertDominatorTreeNodeInsertion(tree, path, newChildren, moreChildrenAvailable, expected);
+}