chore: checkpoint before Python removal

vendor/schemars/tests/chrono.rs

@@ -0,0 +1,19 @@
+mod util;
+use chrono::prelude::*;
+use schemars::JsonSchema;
+use util::*;
+
+#[allow(dead_code)]
+#[derive(JsonSchema)]
+struct ChronoTypes {
+    weekday: Weekday,
+    date_time: DateTime<Utc>,
+    naive_date: NaiveDate,
+    naive_date_time: NaiveDateTime,
+    naive_time: NaiveTime,
+}
+
+#[test]
+fn chrono_types() -> TestResult {
+    test_default_generated_schema::<ChronoTypes>("chrono-types")
+}