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diff --git a/src/test/rustdoc-gui/sidebar-source-code.goml b/src/test/rustdoc-gui/sidebar-source-code.goml
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+// The goal of this test is to ensure that the sidebar is working as expected in the source
+// code pages.
+goto: file://|DOC_PATH|/src/test_docs/lib.rs.html
+// First: desktop mode.
+size: (1100, 800)
+// We check that the sidebar isn't expanded and has the expected width.
+assert-css: ("nav.sidebar", {"width": "50px"})
+// We now click on the button to expand the sidebar.
+click: (10, 10)
+// We wait for the sidebar to be expanded.
+wait-for-css: (".source-sidebar-expanded nav.sidebar", {"width": "300px"})
+assert-css: (".source-sidebar-expanded nav.sidebar a", {"font-size": "14px"})
+// We collapse the sidebar.
+click: (10, 10)
+// We ensure that the class has been removed.
+wait-for: "html:not(.expanded)"
+assert: "nav.sidebar"
+
+// Checking that only the path to the current file is "open".
+goto: file://|DOC_PATH|/src/lib2/another_folder/sub_mod/mod.rs.html
+// First we expand the sidebar again.
+click: (10, 10)
+// We wait for the sidebar to be expanded.
+wait-for-css: (".source-sidebar-expanded nav.sidebar", {"width": "300px"})
+assert: "//*[@class='dir-entry' and @open]/*[text()='lib2']"
+assert: "//*[@class='dir-entry' and @open]/*[text()='another_folder']"
+assert: "//*[@class='dir-entry' and @open]/*[text()='sub_mod']"
+// Only "another_folder" should be "open" in "lib2".
+assert: "//*[@class='dir-entry' and not(@open)]/*[text()='another_mod']"
+// All other trees should be collapsed.
+assert-count: ("//*[@id='source-sidebar']/details[not(text()='lib2') and not(@open)]", 5)
+
+// We now switch to mobile mode.
+size: (600, 600)
+wait-for-css: (".source-sidebar-expanded nav.sidebar", {"width": "600px"})
+// We collapse the sidebar.
+click: (10, 10)
+// We check that the sidebar has the expected width (0).
+assert-css: ("nav.sidebar", {"width": "0px"})
+// We ensure that the class has been removed.
+assert-false: ".source-sidebar-expanded"
+assert: "nav.sidebar"
+
+// Check that the topbar is not visible
+assert-property: (".mobile-topbar", {"offsetParent": "null"})