1 files changed, 24 insertions, 0 deletions
diff --git a/devtools/client/shared/test/browser_flame-graph-utils-hash.js b/devtools/client/shared/test/browser_flame-graph-utils-hash.js
new file mode 100644
index 000000000..6b441bbf5
--- /dev/null
+++ b/devtools/client/shared/test/browser_flame-graph-utils-hash.js
@@ -0,0 +1,24 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Tests if (idle) nodes are added when necessary in the flame graph data.
+
+const {FlameGraphUtils} = require("devtools/client/shared/widgets/FlameGraph");
+
+add_task(function* () {
+  let hash1 = FlameGraphUtils._getStringHash("abc");
+  let hash2 = FlameGraphUtils._getStringHash("acb");
+  let hash3 = FlameGraphUtils._getStringHash(Array.from(Array(100000)).join("a"));
+  let hash4 = FlameGraphUtils._getStringHash(Array.from(Array(100000)).join("b"));
+
+  isnot(hash1, hash2, "The hashes should not be equal (1).");
+  isnot(hash2, hash3, "The hashes should not be equal (2).");
+  isnot(hash3, hash4, "The hashes should not be equal (3).");
+
+  ok(Number.isInteger(hash1), "The hashes should be integers, not Infinity or NaN (1).");
+  ok(Number.isInteger(hash2), "The hashes should be integers, not Infinity or NaN (2).");
+  ok(Number.isInteger(hash3), "The hashes should be integers, not Infinity or NaN (3).");
+  ok(Number.isInteger(hash4), "The hashes should be integers, not Infinity or NaN (4).");
+});