1 files changed, 24 insertions, 0 deletions
diff --git a/devtools/shared/tests/unit/test_flatten.js b/devtools/shared/tests/unit/test_flatten.js
new file mode 100644
index 000000000..f5a186770
--- /dev/null
+++ b/devtools/shared/tests/unit/test_flatten.js
@@ -0,0 +1,24 @@
+/* -*- js-indent-level: 2; indent-tabs-mode: nil -*- */
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Test ThreadSafeDevToolsUtils.flatten
+
+function run_test() {
+  const { flatten } = DevToolsUtils;
+
+  const flat = flatten([["a", "b", "c"],
+                        ["d", "e", "f"],
+                        ["g", "h", "i"]]);
+
+  equal(flat.length, 9);
+  equal(flat[0], "a");
+  equal(flat[1], "b");
+  equal(flat[2], "c");
+  equal(flat[3], "d");
+  equal(flat[4], "e");
+  equal(flat[5], "f");
+  equal(flat[6], "g");
+  equal(flat[7], "h");
+  equal(flat[8], "i");
+}