From f6efa3356622a2b939b93cb4a169c24418cf3446 Mon Sep 17 00:00:00 2001
From: Guillaume Gomez <guillaume.gomez@huawei.com>
Date: Fri, 16 Jul 2021 15:15:23 +0200
Subject: [PATCH] Add GUI test for auto-hide-trait-implementations setting

---
 .../auto-hide-trait-implementations.goml            | 13 +++++++++++++
 src/test/rustdoc-gui/src/test_docs/lib.rs           |  7 +++++++
 2 files changed, 20 insertions(+)
 create mode 100644 src/test/rustdoc-gui/auto-hide-trait-implementations.goml

diff --git a/src/test/rustdoc-gui/auto-hide-trait-implementations.goml b/src/test/rustdoc-gui/auto-hide-trait-implementations.goml
new file mode 100644
index 0000000000000..7b1358fedc3b5
--- /dev/null
+++ b/src/test/rustdoc-gui/auto-hide-trait-implementations.goml
@@ -0,0 +1,13 @@
+// Checks that the setting "auto hide trait implementations" is working as expected.
+goto: file://|DOC_PATH|/test_docs/struct.Foo.html
+
+// By default, the trait implementations are not collapsed.
+assert-attribute: ("#trait-implementations-list > details", {"open": ""}, ALL)
+
+// We now set the setting to auto hide all trait implementations.
+local-storage: {"rustdoc-auto-hide-trait-implementations": "true" }
+// We reload to ensure the trait implementations are collapsed as expected.
+reload:
+
+// We now check that all matching elements don't have the open attributes.
+assert-attribute-false: ("#trait-implementations-list > details", {"open": ""}, ALL)
diff --git a/src/test/rustdoc-gui/src/test_docs/lib.rs b/src/test/rustdoc-gui/src/test_docs/lib.rs
index 85dd8805fbc4c..bed72ccb9f929 100644
--- a/src/test/rustdoc-gui/src/test_docs/lib.rs
+++ b/src/test/rustdoc-gui/src/test_docs/lib.rs
@@ -5,6 +5,7 @@
 #![feature(doc_keyword)]
 #![feature(doc_cfg)]
 
+use std::convert::AsRef;
 use std::fmt;
 
 /// Basic function with some code examples:
@@ -36,6 +37,12 @@ impl Foo {
     }
 }
 
+impl AsRef<str> for Foo {
+    fn as_ref(&self) -> &str {
+        "hello"
+    }
+}
+
 /// Just a normal enum.
 #[doc(alias = "ThisIsAnAlias")]
 pub enum WhoLetTheDogOut {