smartcontract: test case-insensitive device code handling in SDK

Author: martinsander00

smartcontract/sdk/rs/src/commands/device/create.rs

@@ -156,8 +156,10 @@ mod tests {
             )
             .returning(|_, _| Ok(Signature::new_unique()));
 
+        // Use mixed-case input to verify SDK lowercases device codes,
+        // preventing duplicates like "Test_Device" vs "test_device"
         let command = CreateDeviceCommand {
-            code: "test_device".to_string(),
+            code: "Test_Device".to_string(),
             contributor_pk: contributor_pubkey,
             location_pk: location_pubkey,
             exchange_pk: exchange_pubkey,

smartcontract/sdk/rs/src/commands/device/update.rs

@@ -221,9 +221,11 @@ mod tests {
             )
             .returning(|_, _| Ok(Signature::new_unique()));
 
+        // Use mixed-case input to verify SDK lowercases device codes,
+        // preventing duplicates like "Test_Device" vs "test_device"
         let update_command = UpdateDeviceCommand {
             pubkey: device_pubkey,
-            code: Some("test_device".to_string()),
+            code: Some("Test_Device".to_string()),
             contributor_pk: None,
             device_type: Some(DeviceType::Hybrid),
             public_ip: None,