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-rw-r--r--devtools/client/debugger/src/utils/tests/memoizeLast.spec.js31
1 files changed, 31 insertions, 0 deletions
diff --git a/devtools/client/debugger/src/utils/tests/memoizeLast.spec.js b/devtools/client/debugger/src/utils/tests/memoizeLast.spec.js
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index 0000000000..a5622510e3
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+++ b/devtools/client/debugger/src/utils/tests/memoizeLast.spec.js
@@ -0,0 +1,31 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import { memoizeLast } from "../memoizeLast";
+
+const a = { number: 3 };
+const b = { number: 4 };
+
+function add(...numberObjects) {
+ return numberObjects.reduce((prev, cur) => prev + cur.number, 0);
+}
+
+describe("memozie", () => {
+ it("should re-calculate when a value changes", () => {
+ const mAdd = memoizeLast(add);
+ mAdd(a);
+ expect(mAdd(a)).toEqual(3);
+ mAdd(b);
+ expect(mAdd(b)).toEqual(4);
+ });
+
+ it("should only run once", () => {
+ const mockAdd = jest.fn(add);
+ const mAdd = memoizeLast(mockAdd);
+ mAdd(a);
+ mAdd(a);
+
+ expect(mockAdd.mock.calls[0]).toEqual([{ number: 3 }]);
+ });
+});