1 files changed, 83 insertions, 0 deletions
diff --git a/toolkit/modules/tests/xpcshell/test_BinarySearch.js b/toolkit/modules/tests/xpcshell/test_BinarySearch.js
new file mode 100644
index 0000000000..13b5c4ed7a
--- /dev/null
+++ b/toolkit/modules/tests/xpcshell/test_BinarySearch.js
@@ -0,0 +1,83 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const { BinarySearch } = ChromeUtils.importESModule(
+  "resource://gre/modules/BinarySearch.sys.mjs"
+);
+
+function run_test() {
+  // empty array
+  check([], 1, false, 0);
+
+  // one-element array
+  check([2], 2, true, 0);
+  check([2], 1, false, 0);
+  check([2], 3, false, 1);
+
+  // two-element array
+  check([2, 4], 2, true, 0);
+  check([2, 4], 4, true, 1);
+  check([2, 4], 1, false, 0);
+  check([2, 4], 3, false, 1);
+  check([2, 4], 5, false, 2);
+
+  // three-element array
+  check([2, 4, 6], 2, true, 0);
+  check([2, 4, 6], 4, true, 1);
+  check([2, 4, 6], 6, true, 2);
+  check([2, 4, 6], 1, false, 0);
+  check([2, 4, 6], 3, false, 1);
+  check([2, 4, 6], 5, false, 2);
+  check([2, 4, 6], 7, false, 3);
+
+  // duplicates
+  check([2, 2], 2, true, 0);
+  check([2, 2], 1, false, 0);
+  check([2, 2], 3, false, 2);
+
+  // duplicates on the left
+  check([2, 2, 4], 2, true, 1);
+  check([2, 2, 4], 4, true, 2);
+  check([2, 2, 4], 1, false, 0);
+  check([2, 2, 4], 3, false, 2);
+  check([2, 2, 4], 5, false, 3);
+
+  // duplicates on the right
+  check([2, 4, 4], 2, true, 0);
+  check([2, 4, 4], 4, true, 1);
+  check([2, 4, 4], 1, false, 0);
+  check([2, 4, 4], 3, false, 1);
+  check([2, 4, 4], 5, false, 3);
+
+  // duplicates in the middle
+  check([2, 4, 4, 6], 2, true, 0);
+  check([2, 4, 4, 6], 4, true, 1);
+  check([2, 4, 4, 6], 6, true, 3);
+  check([2, 4, 4, 6], 1, false, 0);
+  check([2, 4, 4, 6], 3, false, 1);
+  check([2, 4, 4, 6], 5, false, 3);
+  check([2, 4, 4, 6], 7, false, 4);
+
+  // duplicates all around
+  check([2, 2, 4, 4, 6, 6], 2, true, 0);
+  check([2, 2, 4, 4, 6, 6], 4, true, 2);
+  check([2, 2, 4, 4, 6, 6], 6, true, 4);
+  check([2, 2, 4, 4, 6, 6], 1, false, 0);
+  check([2, 2, 4, 4, 6, 6], 3, false, 2);
+  check([2, 2, 4, 4, 6, 6], 5, false, 4);
+  check([2, 2, 4, 4, 6, 6], 7, false, 6);
+}
+
+function check(array, target, expectedFound, expectedIdx) {
+  let [found, idx] = BinarySearch.search(cmp, array, target);
+  Assert.equal(found, expectedFound);
+  Assert.equal(idx, expectedIdx);
+
+  idx = expectedFound ? expectedIdx : -1;
+  Assert.equal(BinarySearch.indexOf(cmp, array, target), idx);
+  Assert.equal(BinarySearch.insertionIndexOf(cmp, array, target), expectedIdx);
+}
+
+function cmp(num1, num2) {
+  return num1 - num2;
+}