init

crates/domain/tests/entry/date_range_test.rs

@@ -0,0 +1,36 @@
+use chrono::{FixedOffset, TimeZone};
+
+use domain::entry::DateRange;
+use domain::errors::DomainError;
+
+fn utc_dt(year: i32, month: u32, day: u32) -> chrono::DateTime<FixedOffset> {
+    FixedOffset::east_opt(0)
+        .unwrap()
+        .with_ymd_and_hms(year, month, day, 0, 0, 0)
+        .unwrap()
+}
+
+#[test]
+fn valid_range_is_created() {
+    let start = utc_dt(2025, 1, 1);
+    let end = utc_dt(2025, 1, 31);
+    let range = DateRange::new(start, end).unwrap();
+
+    assert_eq!(*range.start(), start);
+    assert_eq!(*range.end(), end);
+}
+
+#[test]
+fn start_equal_to_end_is_valid() {
+    let dt = utc_dt(2025, 6, 15);
+    let range = DateRange::new(dt, dt);
+    assert!(range.is_ok());
+}
+
+#[test]
+fn start_after_end_is_rejected() {
+    let start = utc_dt(2025, 3, 15);
+    let end = utc_dt(2025, 3, 1);
+    let result = DateRange::new(start, end);
+    assert!(matches!(result, Err(DomainError::InvalidInput(_))));
+}