Add tests

Author: hafeoz

src/test/rustdoc-ui/doc-comment-multi-line-attr.rs

@@ -0,0 +1,11 @@
+// Regression test for #97440: Multiline (more than 2 lines) inner attribute triggers ICE during doctest
+// compile-flags:--test
+// normalize-stdout-test: "src/test/rustdoc-ui" -> "$$DIR"
+// normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+// check-pass
+
+//! ```rust
+//! #![deny(
+//! unused_parens,
+//! )]
+//! ```

src/test/rustdoc-ui/doc-comment-multi-line-attr.stdout

@@ -0,0 +1,6 @@
+
+running 1 test
+test $DIR/doc-comment-multi-line-attr.rs - (line 7) ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in $TIME
+