1 files changed, 22 insertions, 0 deletions
diff --git a/devtools/client/application/test/xpcshell/test_ui_reducer.js b/devtools/client/application/test/xpcshell/test_ui_reducer.js
new file mode 100644
index 0000000000..22c1844238
--- /dev/null
+++ b/devtools/client/application/test/xpcshell/test_ui_reducer.js
@@ -0,0 +1,22 @@
+/* Any copyright is dedicated to the Public Domain.
+http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const {
+  updateSelectedPage,
+} = require("resource://devtools/client/application/src/actions/ui.js");
+
+const {
+  uiReducer,
+  UiState,
+} = require("resource://devtools/client/application/src/reducers/ui-state.js");
+
+add_task(async function () {
+  info("Test ui reducer: UPDATE_SELECTED_PAGE action");
+  const state = UiState();
+  const action = updateSelectedPage("foo");
+
+  const newState = uiReducer(state, action);
+  equal(newState.selectedPage, "foo");
+});