chore: checkpoint before Python removal

vendor/writeable/tests/data/data.rs

@@ -0,0 +1,26 @@
+// This file is part of ICU4X. For terms of use, please see the file
+// called LICENSE at the top level of the ICU4X source tree
+// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
+
+#[allow(dead_code)]
+pub const KEBAB_CASE_STRINGS: &[&str] = &[
+    "ca",
+    "ca-ÉS",
+    "ca-ÉS-u-ca-buddhist",
+    "ca-ÉS-valencia",
+    "ca-ÉS-x-gbp",
+    "ca-ÉS-x-gbp-short",
+    "ca-ÉS-x-usd",
+    "ca-ÉS-xyzabc",
+    "ca-x-eur",
+    "cat",
+    "cat-bus",
+    "cat-🚐",
+    "pl-Latn-PL",
+    "und",
+    "und-fonipa",
+    "und-u-ca-hebrew",
+    "und-u-ca-japanese",
+    "und-x-mxn",
+    "zh",
+];

vendor/writeable/tests/writeable.rs

@@ -0,0 +1,34 @@
+// This file is part of ICU4X. For terms of use, please see the file
+// called LICENSE at the top level of the ICU4X source tree
+// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
+
+use std::fmt;
+use writeable::assert_writeable_eq;
+use writeable::LengthHint;
+use writeable::Writeable;
+
+/// A sample type implementing Writeable
+struct WriteableMessage<'s> {
+    message: &'s str,
+}
+
+impl Writeable for WriteableMessage<'_> {
+    fn write_to<W: fmt::Write + ?Sized>(&self, sink: &mut W) -> fmt::Result {
+        sink.write_str(self.message)
+    }
+
+    fn writeable_length_hint(&self) -> LengthHint {
+        LengthHint::exact(self.message.len())
+    }
+}
+
+writeable::impl_display_with_writeable!(WriteableMessage<'_>);
+
+#[test]
+fn test_basic() {
+    let input_string = "hello world";
+    let message = WriteableMessage {
+        message: input_string,
+    };
+    assert_writeable_eq!(&message, input_string);
+}