Fix assert_eq! argument order in metrics tests

The assert_eq! macro arguments were swapped relative to the error message
template. Fixed by swapping 'Expected' and 'Actual' labels in the error
message to match the actual order of arguments (actual, expected).

Signed-off-by: Keiven Chang <keivenchang@users.noreply.github.com>

Author: keivenchang

lib/runtime/examples/system_metrics/src/lib.rs

@@ -96,11 +96,7 @@ pub async fn backend(drt: DistributedRuntime, endpoint_name: Option<&str>) -> an
     // Use the factory pattern - single line factory call with metrics
     let ingress = Ingress::for_engine(RequestHandler::with_metrics(system_metrics))?;
 
-    endpoint
-        .endpoint_builder()
-        .handler(ingress)
-        .start()
-        .await?;
+    endpoint.endpoint_builder().handler(ingress).start().await?;
 
     Ok(())
 }

lib/runtime/src/metrics.rs

@@ -1214,10 +1214,10 @@ dynamo_component_testcounter{dynamo_component="comp345",dynamo_endpoint="ep345",
         assert_eq!(
             endpoint_output_raw, expected_endpoint_output,
             "\n=== ENDPOINT COMPARISON FAILED ===\n\
-             Expected:\n{}\n\
              Actual:\n{}\n\
+             Expected:\n{}\n\
              ==============================",
-            expected_endpoint_output, endpoint_output_raw
+            endpoint_output_raw, expected_endpoint_output
         );
 
         // Test Gauge creation
@@ -1243,10 +1243,10 @@ dynamo_component_testgauge{dynamo_component="comp345",dynamo_namespace="ns345"}
         assert_eq!(
             component_output_raw, expected_component_output,
             "\n=== COMPONENT COMPARISON FAILED ===\n\
-             Expected:\n{}\n\
              Actual:\n{}\n\
+             Expected:\n{}\n\
              ==============================",
-            expected_component_output, component_output_raw
+            component_output_raw, expected_component_output
         );
 
         let intcounter = namespace
@@ -1274,10 +1274,10 @@ dynamo_component_testintcounter{dynamo_namespace="ns345"} 12345"#.to_string();
         assert_eq!(
             namespace_output_raw, expected_namespace_output,
             "\n=== NAMESPACE COMPARISON FAILED ===\n\
-             Expected:\n{}\n\
              Actual:\n{}\n\
+             Expected:\n{}\n\
              ==============================",
-            expected_namespace_output, namespace_output_raw
+            namespace_output_raw, expected_namespace_output
         );
 
         // Test IntGauge creation