refactor(client): encapsulate SignedDuration and enhance its API

Hide internal fields to improve type safety and provide helper methods for unit conversions and negative value checks. Fix several feature-gated test compilation issues.

crates/irtt-cli/src/lib.rs

@@ -774,7 +774,7 @@ fn duration_us(duration: Duration) -> u128 {
 }
 
 fn signed_duration_us(duration: SignedDuration) -> i128 {
-    duration.ns / 1_000
+    duration.as_micros()
 }
 
 fn format_optional_duration(duration: Option<Duration>) -> String {
@@ -788,7 +788,7 @@ fn format_duration(duration: Duration) -> String {
 }
 
 fn format_signed_duration(duration: SignedDuration) -> String {
-    format_signed_ns(duration.ns as f64)
+    format_signed_ns(duration.as_nanos() as f64)
 }
 
 fn format_signed_ns(ns: f64) -> String {
@@ -869,8 +869,8 @@ mod tests {
             received_at: test_timestamp(Duration::from_secs(1) + Duration::from_micros(1500)),
             rtt: RttSample {
                 raw: Duration::from_micros(1500),
-                adjusted: Some(SignedDuration { ns: 1_200_000 }),
-                effective: SignedDuration { ns: 1_200_000 },
+                adjusted: Some(SignedDuration::from_nanos(1_200_000)),
+                effective: SignedDuration::from_nanos(1_200_000),
             },
             server_timing: Some(ServerTiming {
                 receive_wall_ns: Some(1_000),
@@ -894,6 +894,7 @@ mod tests {
         }
     }
 
+    #[cfg(feature = "stats")]
     fn negative_adjusted_reply_event() -> ClientEvent {
         ClientEvent::EchoReply {
             seq: 8,
@@ -902,8 +903,8 @@ mod tests {
             received_at: test_timestamp(Duration::from_secs(1) + Duration::from_micros(500)),
             rtt: RttSample {
                 raw: Duration::from_micros(500),
-                adjusted: Some(SignedDuration { ns: -1_500_000 }),
-                effective: SignedDuration { ns: -1_500_000 },
+                adjusted: Some(SignedDuration::from_nanos(-1_500_000)),
+                effective: SignedDuration::from_nanos(-1_500_000),
             },
             server_timing: Some(ServerTiming {
                 receive_wall_ns: Some(1_000),

crates/irtt-cli/src/main.rs

@@ -15,7 +15,7 @@ use irtt_cli::{
 };
 use irtt_client::{Client, ClientEvent, OpenOutcome, RecvBudget};
 
-#[cfg(test)]
+#[cfg(all(test, feature = "stats"))]
 use irtt_client::ClientTimestamp;
 
 #[cfg(feature = "stats")]
@@ -247,9 +247,14 @@ impl<W: Write> StreamOutput<'_, W> {
 
         let line =
             if self.mode == OutputMode::Human && !matches!(event, ClientEvent::EchoSent { .. }) {
+                #[cfg(feature = "stats")]
+                let human_stats = stats_update.into();
+                #[cfg(not(feature = "stats"))]
+                let human_stats = stats_update;
+
                 Some(format_human_event_with_options(
                     event,
-                    Some(stats_update.into()),
+                    Some(human_stats),
                     self.human_options,
                 ))
             } else {
@@ -426,9 +431,7 @@ mod tests {
             rtt: RttSample {
                 raw: Duration::from_micros(rtt_us),
                 adjusted: None,
-                effective: SignedDuration {
-                    ns: i128::from(rtt_us) * 1_000,
-                },
+                effective: SignedDuration::from_nanos(i128::from(rtt_us) * 1_000),
             },
             server_timing: None,
             one_way: None,
@@ -466,7 +469,7 @@ mod tests {
                 rtt: RttSample {
                     raw: Duration::from_micros(1200),
                     adjusted: None,
-                    effective: SignedDuration { ns: 1_200_000 },
+                    effective: SignedDuration::from_nanos(1_200_000),
                 },
                 server_timing: None,
                 one_way: None,
@@ -579,7 +582,7 @@ mod tests {
                 rtt: RttSample {
                     raw: Duration::from_micros(1),
                     adjusted: None,
-                    effective: SignedDuration { ns: 1_000 },
+                    effective: SignedDuration::from_nanos(1_000),
                 },
                 server_timing: None,
                 one_way: None,

crates/irtt-cli/src/summary.rs

@@ -206,8 +206,8 @@ mod tests {
             received_at,
             rtt: RttSample {
                 raw: Duration::from_micros(1500),
-                adjusted: Some(SignedDuration { ns: 1_200_000 }),
-                effective: SignedDuration { ns: 1_200_000 },
+                adjusted: Some(SignedDuration::from_nanos(1_200_000)),
+                effective: SignedDuration::from_nanos(1_200_000),
             },
             server_timing: Some(ServerTiming {
                 receive_wall_ns: None,
@@ -252,8 +252,8 @@ mod tests {
             received_at,
             rtt: RttSample {
                 raw: Duration::from_micros(1500),
-                adjusted: Some(SignedDuration { ns: 1_200_000 }),
-                effective: SignedDuration { ns: 1_200_000 },
+                adjusted: Some(SignedDuration::from_nanos(1_200_000)),
+                effective: SignedDuration::from_nanos(1_200_000),
             },
             server_timing: None,
             one_way: None,