1 files changed, 25 insertions, 0 deletions
diff --git a/dom/base/test/unit/test_chromeutils_defineLazyGetter.js b/dom/base/test/unit/test_chromeutils_defineLazyGetter.js
new file mode 100644
index 0000000000..a3dae487cf
--- /dev/null
+++ b/dom/base/test/unit/test_chromeutils_defineLazyGetter.js
@@ -0,0 +1,25 @@
+"use strict";
+
+add_task(function test_defineLazyGetter() {
+  let accessCount = 0;
+  let obj = {
+    inScope: false,
+  };
+  const TEST_VALUE = "test value";
+  ChromeUtils.defineLazyGetter(obj, "foo", function () {
+    accessCount++;
+    this.inScope = true;
+    return TEST_VALUE;
+  });
+  Assert.equal(accessCount, 0);
+
+  // Get the property, making sure the access count has increased.
+  Assert.equal(obj.foo, TEST_VALUE);
+  Assert.equal(accessCount, 1);
+  Assert.ok(obj.inScope);
+
+  // Get the property once more, making sure the access count has not
+  // increased.
+  Assert.equal(obj.foo, TEST_VALUE);
+  Assert.equal(accessCount, 1);
+});