1 files changed, 67 insertions, 0 deletions
diff --git a/third_party/rust/chrono/tests/wasm.rs b/third_party/rust/chrono/tests/wasm.rs
new file mode 100644
index 0000000000..275d120d3b
--- /dev/null
+++ b/third_party/rust/chrono/tests/wasm.rs
@@ -0,0 +1,67 @@
+#[cfg(all(test, feature = "wasmbind"))]
+mod test {
+    extern crate chrono;
+    extern crate wasm_bindgen_test;
+
+    use self::chrono::prelude::*;
+    use self::wasm_bindgen_test::*;
+
+    #[wasm_bindgen_test]
+    fn now() {
+        let utc: DateTime<Utc> = Utc::now();
+        let local: DateTime<Local> = Local::now();
+
+        // Ensure time set by the test script is correct
+        let now = env!("NOW");
+        let actual = Utc.datetime_from_str(&now, "%s").unwrap();
+        let diff = utc - actual;
+        assert!(
+            diff < chrono::Duration::minutes(5),
+            "expected {} - {} == {} < 5m (env var: {})",
+            utc,
+            actual,
+            diff,
+            now,
+        );
+
+        let tz = env!("TZ");
+        eprintln!("testing with tz={}", tz);
+
+        // Ensure offset retrieved when getting local time is correct
+        let expected_offset = match tz {
+            "ACST-9:30" => FixedOffset::east(19 * 30 * 60),
+            "Asia/Katmandu" => FixedOffset::east(23 * 15 * 60), // No DST thankfully
+            "EDT" | "EST4" | "-0400" => FixedOffset::east(-4 * 60 * 60),
+            "EST" | "-0500" => FixedOffset::east(-5 * 60 * 60),
+            "UTC0" | "+0000" => FixedOffset::east(0),
+            tz => panic!("unexpected TZ {}", tz),
+        };
+        assert_eq!(
+            &expected_offset,
+            local.offset(),
+            "expected: {:?} local: {:?}",
+            expected_offset,
+            local.offset(),
+        );
+    }
+
+    #[wasm_bindgen_test]
+    fn from_is_exact() {
+        let now = js_sys::Date::new_0();
+
+        let dt = DateTime::<Utc>::from(now.clone());
+
+        assert_eq!(now.get_time() as i64, dt.timestamp_millis());
+    }
+
+    #[wasm_bindgen_test]
+    fn local_from_local_datetime() {
+        let now = Local::now();
+        let ndt = now.naive_local();
+        let res = match Local.from_local_datetime(&ndt).single() {
+            Some(v) => v,
+            None => panic! {"Required for test!"},
+        };
+        assert_eq!(now, res);
+    }
+}