refactor: add get_error_message method to EntrypointOutput class

- Move error message extraction logic from test code into reusable method
- Simplify error handling in docker_base.py test
- Improve code maintainability and reduce duplication
- Addresses GitHub PR feedback from @aaronsteers

Co-Authored-By: AJ Steers <[email protected]>

Author: devin-ai-integration[bot]

airbyte_cdk/test/entrypoint_wrapper.py

@@ -292,6 +292,22 @@ def is_not_in_logs(self, pattern: str) -> bool:
         """Check if no log message matches the case-insensitive pattern."""
         return not self.is_in_logs(pattern)
 
+    def get_error_message(self) -> str:
+        """Extract a formatted error message from error traces."""
+        if not self.errors:
+            return "No error messages found"
+
+        error_messages = [
+            f"Error message: {error.trace.error.message}"
+            for error in self.errors
+            if error.trace and error.trace.error
+        ]
+
+        if not error_messages:
+            return "No structured error messages found"
+
+        return "\n".join(error_messages)
+
     @classmethod
     def from_completed_process(
         cls,

airbyte_cdk/test/standard_tests/docker_base.py

@@ -375,18 +375,12 @@ def test_docker_image_build_and_read(
                 capture_stdout=True,
             )
             if read_result.errors:
-                error_messages = [
-                    f"Error message: {error.trace.error.message}"
-                    for error in read_result.errors
-                    if error.trace and error.trace.error
-                ]
-                if not error_messages:
-                    error_messages = ["No structured error messages found"]
+                error_message = read_result.get_error_message()
 
                 raise AssertionError(
                     f"Failed to run `read` command in docker image {connector_image!r}. "
                     "\n-----------------"
                     "ERROR MESSAGES:\n"
-                    f"{chr(10).join(error_messages)}\n"
+                    f"{error_message}\n"
                     "\n-----------------"
                 ) from None