1 files changed, 25 insertions, 0 deletions
diff --git a/third_party/rust/unicode-xid/tests/exhaustive_tests.rs b/third_party/rust/unicode-xid/tests/exhaustive_tests.rs
new file mode 100644
index 0000000000..9baac20327
--- /dev/null
+++ b/third_party/rust/unicode-xid/tests/exhaustive_tests.rs
@@ -0,0 +1,25 @@
+extern crate unicode_xid;
+use unicode_xid::UnicodeXID;
+/// A `char` in Rust is a Unicode Scalar Value
+///
+/// See: http://www.unicode.org/glossary/#unicode_scalar_value
+fn all_valid_chars() -> impl Iterator<Item = char> {
+    (0u32..=0xD7FF).chain(0xE000u32..=0x10FFFF).map(|u| {
+        core::convert::TryFrom::try_from(u)
+            .expect("The selected range should be infallible if the docs match impl")
+    })
+}
+
+#[test]
+fn all_valid_chars_do_not_panic_for_is_xid_start() {
+    for c in all_valid_chars() {
+        let _ = UnicodeXID::is_xid_start(c);
+    }
+}
+
+#[test]
+fn all_valid_chars_do_not_panic_for_is_xid_continue() {
+    for c in all_valid_chars() {
+        let _ = UnicodeXID::is_xid_continue(c);
+    }
+}