Add new file role teacher_defined_linter

lib/docker_client.rb

@@ -376,10 +376,13 @@ class DockerClient
     """
     Stick to existing Docker API with exec command.
     """
-    filepath = submission.collect_files.find { |f| f.name_with_extension == filename }.filepath
+    file = submission.collect_files.find { |f| f.name_with_extension == filename }
+    filepath = file.filepath
     command = submission.execution_environment.test_command % command_substitutions(filepath)
     create_workspace_files = proc { create_workspace_files(container, submission) }
-    execute_command(command, create_workspace_files, block)
+    test_result = execute_command(command, create_workspace_files, block)
+    test_result.merge!(file_role: file.role)
+    test_result
   end
 
   def self.find_image_by_tag(tag)

lib/py_unit_and_py_lint_adapter.rb

@@ -5,9 +5,10 @@ class PyUnitAndPyLintAdapter < TestingFrameworkAdapter
   end
 
   def parse_output(output)
-    PyLintAdapter.new.parse_output(output)
-  rescue NoMethodError
-    # The regex for PyLint failed and did not return any matches
-    PyUnitAdapter.new.parse_output(output)
+    if output[:file_role] == 'teacher_defined_linter'
+      PyLintAdapter.new.parse_output(output)
+    else
+      PyUnitAdapter.new.parse_output(output)
+    end
   end
 end