Add tests to check that collapsed content is expanded when jumping to it

tests/rustdoc-gui/go-to-collapsed-elem.goml

@@ -0,0 +1,21 @@
+// This test ensures that when clicking on a link which leads to an item inside a collapsed element,
+// the collapsed element will be expanded.
+goto: "file://" + |DOC_PATH| + "/test_docs/struct.Foo.html"
+// We check that the implementors block is expanded.
+assert-property: ("#implementations-list .implementors-toggle", {"open": "true"})
+// We now collapse the implementors block.
+property: ("#implementations-list .implementors-toggle", {"open": "false"})
+// And now we click on the link to the method to ensure it'll expand the implementors block.
+click: "//*[@class='sidebar']//a[@href='#method.must_use']"
+assert-property: ("#implementations-list .implementors-toggle", {"open": "true"})
+
+// Now we do the same through search result.
+// First we reload the page without the anchor in the URL.
+goto: "file://" + |DOC_PATH| + "/test_docs/struct.Foo.html"
+// Then we collapse the section again...
+property: ("#implementations-list .implementors-toggle", {"open": "false"})
+// Then we run the search.
+write: (".search-input", "foo::must_use")
+wait-for: "//*[@id='search']//a[@href='../test_docs/struct.Foo.html#method.must_use']"
+click: "//*[@id='search']//a[@href='../test_docs/struct.Foo.html#method.must_use']"
+assert-property: ("#implementations-list .implementors-toggle", {"open": "true"})