1 files changed, 29 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/duration_subsec.rs b/src/tools/clippy/tests/ui/duration_subsec.rs
new file mode 100644
index 000000000..08da80499
--- /dev/null
+++ b/src/tools/clippy/tests/ui/duration_subsec.rs
@@ -0,0 +1,29 @@
+// run-rustfix
+#![allow(dead_code, clippy::needless_borrow)]
+#![warn(clippy::duration_subsec)]
+
+use std::time::Duration;
+
+fn main() {
+    let dur = Duration::new(5, 0);
+
+    let bad_millis_1 = dur.subsec_micros() / 1_000;
+    let bad_millis_2 = dur.subsec_nanos() / 1_000_000;
+    let good_millis = dur.subsec_millis();
+    assert_eq!(bad_millis_1, good_millis);
+    assert_eq!(bad_millis_2, good_millis);
+
+    let bad_micros = dur.subsec_nanos() / 1_000;
+    let good_micros = dur.subsec_micros();
+    assert_eq!(bad_micros, good_micros);
+
+    // Handle refs
+    let _ = (&dur).subsec_nanos() / 1_000;
+
+    // Handle constants
+    const NANOS_IN_MICRO: u32 = 1_000;
+    let _ = dur.subsec_nanos() / NANOS_IN_MICRO;
+
+    // Other literals aren't linted
+    let _ = dur.subsec_nanos() / 699;
+}