Add CI tests for chapter 7 (#239)

ch07/01_main-chapter-code/tests.py

@@ -0,0 +1,16 @@
+# Copyright (c) Sebastian Raschka under Apache License 2.0 (see LICENSE.txt).
+# Source for "Build a Large Language Model From Scratch"
+#   - https://www.manning.com/books/build-a-large-language-model-from-scratch
+# Code: https://github.com/rasbt/LLMs-from-scratch
+
+# File for internal use (unit tests)
+
+
+import subprocess
+
+
+def test_gpt_class_finetune():
+    command = ["python", "ch06/01_main-chapter-code/gpt_class_finetune.py", "--test_mode"]
+
+    result = subprocess.run(command, capture_output=True, text=True)
+    assert result.returncode == 0, f"Script exited with errors: {result.stderr}"