1 files changed, 37 insertions, 0 deletions
diff --git a/browser/components/urlbar/tests/unit/test_providersManager_maxResults.js b/browser/components/urlbar/tests/unit/test_providersManager_maxResults.js
new file mode 100644
index 0000000000..b30b9352cd
--- /dev/null
+++ b/browser/components/urlbar/tests/unit/test_providersManager_maxResults.js
@@ -0,0 +1,37 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function test_maxResults() {
+  const MATCHES_LENGTH = 20;
+  let matches = [];
+  for (let i = 0; i < MATCHES_LENGTH; i++) {
+    matches.push(
+      new UrlbarResult(
+        UrlbarUtils.RESULT_TYPE.TAB_SWITCH,
+        UrlbarUtils.RESULT_SOURCE.TABS,
+        { url: `http://mozilla.org/foo/${i}` }
+      )
+    );
+  }
+  let provider = registerBasicTestProvider(matches);
+  let context = createContext(undefined, { providers: [provider.name] });
+  let controller = UrlbarTestUtils.newMockController();
+
+  async function test_count(count) {
+    let promise = promiseControllerNotification(controller, "onQueryFinished");
+    context.maxResults = count;
+    await controller.startQuery(context);
+    await promise;
+    Assert.equal(
+      context.results.length,
+      Math.min(MATCHES_LENGTH, count),
+      "Check count"
+    );
+    Assert.deepEqual(context.results, matches.slice(0, count), "Check results");
+  }
+  await test_count(10);
+  await test_count(1);
+  await test_count(30);
+});