style(client): reformat imports in test files

Collapse multi-line import statements into single lines to improve code legibility and maintain consistent formatting across test suites.

crates/irtt-client/tests/hmac.rs

@@ -3,8 +3,7 @@ mod support;
 use std::time::Duration;
 
 use irtt_client::{
-    Client, ClientConfig, ClientError, ClientEvent, OpenOutcome, SocketConfig,
-    WarningKind,
+    Client, ClientConfig, ClientError, ClientEvent, OpenOutcome, SocketConfig, WarningKind,
 };
 use irtt_proto::{echo_packet_len, ProtoError, TimestampFields};
 

crates/irtt-client/tests/server_fill.rs

@@ -1,8 +1,6 @@
 mod support;
 
-use irtt_client::{
-    Client, ClientConfig, ClientError, ClientEvent, NegotiationPolicy,
-};
+use irtt_client::{Client, ClientConfig, ClientError, ClientEvent, NegotiationPolicy};
 use irtt_proto::{echo_packet_len, Params, TimestampFields};
 
 use support::{

crates/irtt-client/tests/support/mod.rs

@@ -10,9 +10,7 @@ use std::{
     time::{Duration, SystemTime},
 };
 
-use irtt_client::{
-    Client, ClientConfig, ClientEvent, NegotiatedParams, OpenOutcome, SocketConfig,
-};
+use irtt_client::{Client, ClientConfig, ClientEvent, NegotiatedParams, OpenOutcome, SocketConfig};
 use irtt_proto::{
     compute_hmac_in_place, echo_packet_len, flags, verify_hmac, Clock, Params, ProtoError,
     ReceivedStats, ServerFill, StampAt, TimestampFields, HMAC_SIZE, MAGIC, PROTOCOL_VERSION,