Rollup merge of #143210 - Kivooeo:tf19, r=tgross35

`tests/ui`: A New Order [19/N]

> [!NOTE]
>
> Intermediate commits are intended to help review, but will be squashed prior to merge.

Some `tests/ui/` housekeeping, to trim down number of tests directly under `tests/ui/`. Part of rust-lang/rust#133895.

r? `@tgross35`

1 files changed, 20 insertions, 0 deletions

diff --git a/tests/ui/parser/unicode-escape-sequences.rs b/tests/ui/parser/unicode-escape-sequences.rs
new file mode 100644
index 00000000000..8b084866f19
--- /dev/null
+++ b/tests/ui/parser/unicode-escape-sequences.rs
@@ -0,0 +1,20 @@
+//! Test ES6-style Unicode escape sequences in string literals.
+//!
+//! Regression test for RFC 446 implementation.
+//! See <https://github.com/rust-lang/rust/pull/19480>.
+
+//@ run-pass
+
+pub fn main() {
+    // Basic Unicode escape - snowman character
+    let s = "\u{2603}";
+    assert_eq!(s, "☃");
+
+    let s = "\u{2a10}\u{2A01}\u{2Aa0}";
+    assert_eq!(s, "⨐⨁⪠");
+
+    let s = "\\{20}";
+    let mut correct_s = String::from("\\");
+    correct_s.push_str("{20}");
+    assert_eq!(s, correct_s);
+}