1 files changed, 42 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 0000000000..bcd26ffa04
--- /dev/null
+++ b/devtools/client/shared/test/browser_flame-graph-utils-hash.js
@@ -0,0 +1,42 @@
+/* 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(async function() {
+  const hash1 = FlameGraphUtils._getStringHash("abc");
+  const hash2 = FlameGraphUtils._getStringHash("acb");
+  const hash3 = FlameGraphUtils._getStringHash(
+    Array.from(Array(100000)).join("a")
+  );
+  const 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)."
+  );
+});