Add rustdoc-gui test to ensure sidebars share the same image

Author: GuillaumeGomez

tests/rustdoc-gui/sidebar.goml

@@ -199,6 +199,42 @@ assert-position-false: (".sidebar-crate > h2 > a", {"x": -3})
 drag-and-drop: ((205, 100), (108, 100))
 assert-position: (".sidebar-crate > h2 > a", {"x": -3})
 
+// Check that the mobile sidebar and the source sidebar use the same icon.
+store-css: (".mobile-topbar .sidebar-menu-toggle::before", {"content": image_url})
+// Then we go to a source page.
+click: ".main-heading .src"
+assert-css: ("#sidebar-button a::before", {"content": |image_url|})
+// Check that hover events work as expected.
+store-css: ("#sidebar-button a", {"background-color": sidebar_background})
+move-cursor-to: "#sidebar-button a"
+store-css: ("#sidebar-button a:hover", {"background-color": sidebar_background_hover})
+assert: |sidebar_background| != |sidebar_background_hover|
+click: "#sidebar-button a"
+wait-for: "html.src-sidebar-expanded"
+assert-css: ("#sidebar-button a:hover", {"background-color": |sidebar_background_hover|})
+move-cursor-to: "#settings-menu"
+assert-css: ("#sidebar-button a:not(:hover)", {"background-color": |sidebar_background|})
+// Closing sidebar.
+click: "#sidebar-button a"
+wait-for: "html:not(.src-sidebar-expanded)"
+// Now we check the same when the sidebar button is moved alongside the search.
+set-window-size: (500, 500)
+store-css: ("#sidebar-button a:hover", {"background-color": not_sidebar_background_hover})
+move-cursor-to: "#settings-menu"
+store-css: ("#sidebar-button a:not(:hover)", {"background-color": not_sidebar_background})
+// The sidebar background is supposed to be the same as the main background.
+assert-css: ("body", {"background-color": |not_sidebar_background|})
+assert: |not_sidebar_background| != |not_sidebar_background_hover| && |not_sidebar_background| != |sidebar_background|
+// The hover background is supposed to be the same as the sidebar background.
+assert: |not_sidebar_background_hover| == |sidebar_background|
+click: "#sidebar-button a"
+wait-for: "html.src-sidebar-expanded"
+// And now the background colors are supposed to be the same as the sidebar since the sidebar has
+// been open.
+assert-css: ("#sidebar-button a:hover", {"background-color": |sidebar_background_hover|})
+move-cursor-to: "h2"
+assert-css: ("#sidebar-button a:not(:hover)", {"background-color": |sidebar_background|})
+
 // Configuration option to show TOC in sidebar.
 set-local-storage: {"rustdoc-hide-toc": "true"}
 go-to: "file://" + |DOC_PATH| + "/test_docs/enum.WhoLetTheDogOut.html"