Add GUI test to enforce tooltip position

Author: GuillaumeGomez

src/test/rustdoc-gui/check_info_sign_position.goml

@@ -0,0 +1,9 @@
+goto: file://|DOC_PATH|/index.html
+goto: ./fn.check_list_code_block.html
+// If the codeblock is the first element of the docblock, the information tooltip must have
+// have some top margin to avoid going over the toggle (the "[+]").
+assert: (".docblock > .information > .compile_fail", { "margin-top": "16px" })
+// Checks that the other codeblocks don't have this top margin.
+assert: ("ol > li > .information > .compile_fail", { "margin-top": "0px" })
+assert: ("ol > li > .information > .ignore", { "margin-top": "0px" })
+assert: (".docblock > .information > .ignore", { "margin-top": "0px" })

src/test/rustdoc-gui/lib.rs

@@ -57,16 +57,26 @@ pub trait AnotherOne {
     fn func3();
 }
 
+/// ```compile_fail
+/// whatever
+/// ```
+///
 /// Check for "i" signs in lists!
 ///
 /// 1. elem 1
-/// 2.test 1
-///   ```compile_fail
-///   fn foo() {}
-///   ```
+/// 2. test 1
+///    ```compile_fail
+///    fn foo() {}
+///    ```
 /// 3. elem 3
 /// 4. ```ignore (it's a test)
 ///    fn foo() {}
 ///    ```
 /// 5. elem 5
+///
+/// Final one:
+///
+/// ```ignore (still a test)
+/// let x = 12;
+/// ```
 pub fn check_list_code_block() {}