Add test for <code> in doc blocks on mobile

src/test/rustdoc-gui/docblock-big-code-mobile.goml

+// If we have a long `<code>`, we need to ensure that it'll be fully displayed on mobile, meaning
+// that it'll be on two lines.
+emulate: "iPhone 8" // it has the following size: (375, 667)
+goto: file://|DOC_PATH|/test_docs/long_code_block/index.html
+// We now check that the block is on two lines:
+show-text: true // We need to enable text draw to be able to have the "real" size
+// Little explanations for this test: if the text wasn't displayed on two lines, it would take
+// around 20px (which is the font size).
+assert-property: (".docblock p > code", {"offsetHeight": "42"})

src/test/rustdoc-gui/src/test_docs/lib.rs

@@ -120,3 +120,6 @@ pub mod keyword {}
 pub mod huge_amount_of_consts {
     include!(concat!(env!("OUT_DIR"), "/huge_amount_of_consts.rs"));
 }
+
+/// Very long code text `hereIgoWithLongTextBecauseWhyNotAndWhyWouldntI`.
+pub mod long_code_block {}