1 files changed, 60 insertions, 0 deletions
diff --git a/dom/base/test/unit/test_chromeutils_shallowclone.js b/dom/base/test/unit/test_chromeutils_shallowclone.js
new file mode 100644
index 0000000000..03e0d443c9
--- /dev/null
+++ b/dom/base/test/unit/test_chromeutils_shallowclone.js
@@ -0,0 +1,60 @@
+"use strict";
+
+add_task(function test_shallowclone() {
+  // Check that shallow cloning an object with regular properties,
+  // results into a new object with all properties from the source object.
+  const fullyCloneableObject = {
+    numProp: 123,
+    strProp: "str",
+    boolProp: true,
+    arrayProp: [{ item1: "1", item2: "2" }],
+    fnProp() {
+      return "fn result";
+    },
+    promise: Promise.resolve("promised-value"),
+    weakmap: new WeakMap(),
+    proxy: new Proxy({}, {}),
+  };
+
+  let clonedObject = ChromeUtils.shallowClone(fullyCloneableObject);
+
+  Assert.deepEqual(
+    clonedObject,
+    fullyCloneableObject,
+    "Got the expected cloned object for an object with regular properties"
+  );
+
+  // Check that shallow cloning an object with getters and setters properties,
+  // results into a new object without all the properties from the source object excluded
+  // its getters and setters.
+  const objectWithGetterAndSetter = {
+    get myGetter() {
+      return "getter result";
+    },
+    set mySetter(v) {},
+    myFunction() {
+      return "myFunction result";
+    },
+  };
+
+  clonedObject = ChromeUtils.shallowClone(objectWithGetterAndSetter);
+
+  Assert.deepEqual(
+    clonedObject,
+    {
+      myFunction: objectWithGetterAndSetter.myFunction,
+    },
+    "Got the expected cloned object for an object with getters and setters"
+  );
+
+  // Check that shallow cloning a proxy object raises the expected exception..
+  const proxyObject = new Proxy(fullyCloneableObject, {});
+
+  Assert.throws(
+    () => {
+      ChromeUtils.shallowClone(proxyObject);
+    },
+    /Shallow cloning a proxy object is not allowed/,
+    "Got the expected error on ChromeUtils.shallowClone called on a proxy object"
+  );
+});