Add GUI test for item info position

Author: GuillaumeGomez

src/test/rustdoc-gui/item-info-width.goml

@@ -0,0 +1,32 @@
+// This test ensures a few things for item info elements.
+goto: file://|DOC_PATH|/lib2/struct.Foo.html
+// Ensuring that the item information don't take 100% of the width if unnecessary.
+// We set a fixed size so there is no chance of "random" resize.
+size: (1100, 800)
+// We check that ".item-info" is bigger than its content.
+assert-css: (".item-info", {"width": "790px"})
+assert-css: (".item-info .stab", {"width": "289px"})
+assert-position: (".item-info .stab", {"x": 295})
+
+// Now we ensure that they're not rendered on the same line.
+goto: file://|DOC_PATH|/lib2/trait.Trait.html
+// We first ensure that there are two item info on the trait.
+assert-count: ("#main-content > .item-info .stab", 2)
+// They should not have the same `y` position!
+compare-elements-position-false: (
+    "#main-content > .item-info .stab:nth-of-type(1)",
+    "#main-content > .item-info .stab:nth-of-type(2)",
+    ("y"),
+)
+// But they should have the same `x` position.
+compare-elements-position: (
+    "#main-content > .item-info .stab:nth-of-type(1)",
+    "#main-content > .item-info .stab:nth-of-type(2)",
+    ("x"),
+)
+// They are supposed to have the same height too.
+compare-elements-css: (
+    "#main-content > .item-info .stab:nth-of-type(1)",
+    "#main-content > .item-info .stab:nth-of-type(2)",
+    ["height"],
+)

src/test/rustdoc-gui/item-info.goml

@@ -30,10 +30,13 @@ impl Foo {
     pub fn a_method(&self) {}
 }
 
+#[doc(cfg(feature = "foo-method"))]
+#[deprecated = "Whatever [`Foo::a_method`](#method.a_method)"]
 pub trait Trait {
     type X;
     const Y: u32;
 
+    #[deprecated = "Whatever [`Foo`](#tadam)"]
     fn foo() {}
 }