Update crate references in codegen tests

Update imports to use `roto_tonic` instead of `crate` for BufferPool
and StatusBody. Remove the broad replacement of `crate` with `roto`
and add error output to `test_map_build.rs`.

codegen/tests/build_generated_code.rs

@@ -68,10 +68,11 @@ fn test_generated_code_builds() {
 
     // 4. Write the generated code to src/lib.rs
     // The generated code uses `use crate::{...}`, but it's now in a separate crate.
-    // Replace `crate` with `roto` to reference the types in the dependency.
+    // Replace `crate` with `roto_tonic` to reference the types in the dependency.
     let mut all_code = String::new();
     for (_, content) in generated_files {
-        all_code.push_str(&content);
+        let replaced = content.replace("use crate::{BufferPool, StatusBody};", "use roto_tonic::{BufferPool, StatusBody};");
+        all_code.push_str(&replaced);
         all_code.push_str("\n");
     }
     let lib_path = temp_project_dir.join("src/lib.rs");

codegen/tests/test_helloworld_build.rs

@@ -55,12 +55,12 @@ fn test_helloworld_generated_code_builds() {
     // 4. Write the generated code to src/lib.rs
     let mut all_code = String::new();
     for (_, content) in generated_files {
-        all_code.push_str(&content);
+        let replaced = content.replace("use crate::{BufferPool, StatusBody};", "use roto_tonic::{BufferPool, StatusBody};");
+        all_code.push_str(&replaced);
         all_code.push_str("\n");
     }
-    let final_code = all_code.replace("use crate::", "use roto::");
     let lib_path = temp_project_dir.join("src/lib.rs");
-    fs::write(lib_path, final_code).expect("Failed to write generated code to src/lib.rs");
+    fs::write(lib_path, all_code).expect("Failed to write generated code to src/lib.rs");
 
     // 5. Attempt to build the project
     let build_status = Command::new("cargo")

codegen/tests/test_map_build.rs

@@ -49,22 +49,26 @@ fn test_map_generated_code_builds() {
     // 4. Write the generated code to src/lib.rs
     let mut all_code = String::new();
     for (_, content) in generated_files {
-        all_code.push_str(&content);
+        let replaced = content.replace("use crate::{BufferPool, StatusBody};", "use roto_tonic::{BufferPool, StatusBody};");
+        all_code.push_str(&replaced);
         all_code.push_str("\n");
     }
-    let final_code = all_code.replace("use crate::", "use roto::");
     let lib_path = temp_project_dir.join("src/lib.rs");
-    fs::write(lib_path, final_code).expect("Failed to write generated code to src/lib.rs");
+    fs::write(lib_path, all_code).expect("Failed to write generated code to src/lib.rs");
 
     // 5. Attempt to build the project
-    let build_status = Command::new("cargo")
+    let output = Command::new("cargo")
         .args(["build"])
         .current_dir(&temp_project_dir)
-        .status()
+        .output()
         .expect("Failed to run cargo build");
 
+    if !output.status.success() {
+        eprintln!("Cargo build failed:\n{}", String::from_utf8_lossy(&output.stderr));
+    }
+
     assert!(
-        build_status.success(),
+        output.status.success(),
         "The generated Rust code for test_map.proto failed to build in a standalone project!"
     );
 }

codegen/tests/test_types_build.rs

@@ -49,17 +49,12 @@ fn test_types_generated_code_builds() {
     // 4. Write the generated code to src/lib.rs
     let mut all_code = String::new();
     for (_, content) in generated_files {
-        all_code.push_str(&content);
+        let replaced = content.replace("use crate::{BufferPool, StatusBody};", "use roto_tonic::{BufferPool, StatusBody};");
+        all_code.push_str(&replaced);
         all_code.push_str("\n");
     }
-    // The generated code uses `use crate::{...}`, but it's now in a separate crate.
-    // Replace `crate` with `roto` to reference the types in the dependency.
-    // Note: in build_generated_code.rs it does replace("use crate::", "use roto::").
-    // But here the generated code might not have dependencies since it's a single file.
-    // However, to be safe and consistent with the template:
-    let final_code = all_code.replace("use crate::", "use roto::");
     let lib_path = temp_project_dir.join("src/lib.rs");
-    fs::write(lib_path, final_code).expect("Failed to write generated code to src/lib.rs");
+    fs::write(lib_path, all_code).expect("Failed to write generated code to src/lib.rs");
 
     // 5. Attempt to build the project
     let build_status = Command::new("cargo")