1 files changed, 146 insertions, 0 deletions
diff --git a/browser/components/shell/test/browser_setDefaultBrowser.js b/browser/components/shell/test/browser_setDefaultBrowser.js
new file mode 100644
index 0000000000..ecf7fcb303
--- /dev/null
+++ b/browser/components/shell/test/browser_setDefaultBrowser.js
@@ -0,0 +1,146 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+ChromeUtils.defineESModuleGetters(this, {
+  ExperimentAPI: "resource://nimbus/ExperimentAPI.sys.mjs",
+  ExperimentFakes: "resource://testing-common/NimbusTestUtils.sys.mjs",
+  NimbusFeatures: "resource://nimbus/ExperimentAPI.sys.mjs",
+  sinon: "resource://testing-common/Sinon.sys.mjs",
+});
+
+const _handleWDBAResultStub = sinon
+  .stub(ShellService, "_handleWDBAResult")
+  .callsFake(async () => {
+    throw new Error("from _handleWDBAResultStub");
+  });
+
+const _callExternalDefaultBrowserAgentStub = sinon
+  .stub(ShellService, "_callExternalDefaultBrowserAgent")
+  .callsFake(async () => ({
+    async wait() {
+      return { exitCode: 0 };
+    },
+  }));
+
+const _userChoiceImpossibleTelemetryResultStub = sinon
+  .stub(ShellService, "_userChoiceImpossibleTelemetryResult")
+  .callsFake(() => null);
+
+const userChoiceStub = sinon
+  .stub(ShellService, "setAsDefaultUserChoice")
+  .resolves();
+const setDefaultStub = sinon.stub();
+const shellStub = sinon
+  .stub(ShellService, "shellService")
+  .value({ setDefaultBrowser: setDefaultStub });
+
+registerCleanupFunction(() => {
+  _handleWDBAResultStub.restore();
+  _callExternalDefaultBrowserAgentStub.restore();
+  _userChoiceImpossibleTelemetryResultStub.restore();
+  userChoiceStub.restore();
+  shellStub.restore();
+
+  ExperimentAPI._store._deleteForTests("shellService");
+});
+
+let defaultUserChoice;
+add_task(async function need_user_choice() {
+  ShellService.setDefaultBrowser();
+  defaultUserChoice = userChoiceStub.called;
+
+  Assert.ok(
+    defaultUserChoice !== undefined,
+    "Decided which default browser method to use"
+  );
+  Assert.equal(
+    setDefaultStub.notCalled,
+    defaultUserChoice,
+    "Only one default behavior was used"
+  );
+});
+
+add_task(async function remote_disable() {
+  if (defaultUserChoice === false) {
+    info("Default behavior already not user choice, so nothing to test");
+    return;
+  }
+
+  userChoiceStub.resetHistory();
+  setDefaultStub.resetHistory();
+  let doCleanup = await ExperimentFakes.enrollWithRollout({
+    featureId: NimbusFeatures.shellService.featureId,
+    value: {
+      setDefaultBrowserUserChoice: false,
+      enabled: true,
+    },
+  });
+
+  ShellService.setDefaultBrowser();
+
+  Assert.ok(
+    userChoiceStub.notCalled,
+    "Set default with user choice disabled via nimbus"
+  );
+  Assert.ok(setDefaultStub.called, "Used plain set default insteead");
+
+  await doCleanup();
+});
+
+add_task(async function restore_default() {
+  if (defaultUserChoice === undefined) {
+    info("No default user choice behavior set, so nothing to test");
+    return;
+  }
+
+  userChoiceStub.resetHistory();
+  setDefaultStub.resetHistory();
+  ExperimentAPI._store._deleteForTests("shellService");
+
+  ShellService.setDefaultBrowser();
+
+  Assert.equal(
+    userChoiceStub.called,
+    defaultUserChoice,
+    "Set default with user choice restored to original"
+  );
+  Assert.equal(
+    setDefaultStub.notCalled,
+    defaultUserChoice,
+    "Plain set default behavior restored to original"
+  );
+});
+
+add_task(async function ensure_fallback() {
+  if (!AppConstants.isPlatformAndVersionAtLeast("win", "10")) {
+    info("Nothing to test on non-Windows");
+    return;
+  }
+
+  let userChoicePromise = Promise.resolve();
+  userChoiceStub.callsFake(function (...args) {
+    return (userChoicePromise = userChoiceStub.wrappedMethod.apply(this, args));
+  });
+  userChoiceStub.resetHistory();
+  setDefaultStub.resetHistory();
+  let doCleanup = await ExperimentFakes.enrollWithRollout({
+    featureId: NimbusFeatures.shellService.featureId,
+    value: {
+      setDefaultBrowserUserChoice: true,
+      setDefaultPDFHandler: false,
+      enabled: true,
+    },
+  });
+
+  ShellService.setDefaultBrowser();
+
+  Assert.ok(userChoiceStub.called, "Set default with user choice called");
+
+  let thrown = false;
+  await userChoicePromise.catch(() => (thrown = true));
+
+  Assert.ok(thrown, "Set default with user choice threw an error");
+  Assert.ok(setDefaultStub.called, "Fallbacked to plain set default");
+
+  await doCleanup();
+});