1 files changed, 27 insertions, 0 deletions
diff --git a/devtools/client/responsive/test/xpcshell/test_rotate_viewport.js b/devtools/client/responsive/test/xpcshell/test_rotate_viewport.js
new file mode 100644
index 0000000000..7d34daa39f
--- /dev/null
+++ b/devtools/client/responsive/test/xpcshell/test_rotate_viewport.js
@@ -0,0 +1,27 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test rotating the viewport.
+
+const {
+  addViewport,
+  rotateViewport,
+} = require("resource://devtools/client/responsive/actions/viewports.js");
+
+add_task(async function () {
+  const store = Store();
+  const { getState, dispatch } = store;
+
+  dispatch(addViewport());
+
+  let viewport = getState().viewports[0];
+  equal(viewport.width, 320, "Default width of 320");
+  equal(viewport.height, 480, "Default height of 480");
+
+  dispatch(rotateViewport(0));
+  viewport = getState().viewports[0];
+  equal(viewport.width, 480, "Rotated width of 480");
+  equal(viewport.height, 320, "Rotated height of 320");
+});