added testcases for messages.py

tests/test_main.py

@@ -8,6 +8,7 @@ from chatmastermind.api_client import ai
 from chatmastermind.configuration import Config
 from chatmastermind.storage import create_chat_hist, save_answers, dump_data
 from chatmastermind.tags import Tag, TagLine, TagError
+from chatmastermind.message import source_code
 from unittest import mock
 from unittest.mock import patch, MagicMock, Mock, ANY
 
@@ -345,3 +346,57 @@ class TestTagLine(CmmTestCase):
         # Test case 9: 'tags_or' and 'tags_and' are None, match all tags except excluded tags
         tags_not = {Tag('tag2')}
         self.assertFalse(tagline.match_tags(None, None, tags_not))
+
+
+class SourceCodeTestCase(CmmTestCase):
+    def test_source_code_with_include_delims(self) -> None:
+        text = """
+        Some text before the code block
+        ```python
+        print("Hello, World!")
+        ```
+        Some text after the code block
+        ```python
+        x = 10
+        y = 20
+        print(x + y)
+        ```
+        """
+        expected_result = [
+            "       ```python\n     print(\"Hello, World!\")\n      ```",
+            "       ```python\n     x = 10\n        y = 20\n        print(x + y)\n```"
+        ]
+        result = source_code(text, include_delims=True)
+        self.assertEqual(result, expected_result)
+
+    def test_source_code_without_include_delims(self) -> None:
+        text = """
+        Some text before the code block
+        ```python
+        print("Hello, World!")
+        ```
+        Some text after the code block
+        ```python
+        x = 10
+        y = 20
+        print(x + y)
+        ```
+        """
+        expected_result = [
+            "       print(\"Hello, World!\")\n",
+            "       x = 10\n        y = 20\n        print(x + y\n)"
+        ]
+        result = source_code(text, include_delims=False)
+        self.assertEqual(result, expected_result)
+
+    def test_source_code_with_single_code_block(self) -> None:
+        text = "```python\nprint(\"Hello, World!\")\n```"
+        expected_result = ["```python\nprint(\"Hello, World!\")\n```"]
+        result = source_code(text, include_delims=True)
+        self.assertEqual(result, expected_result)
+
+    def test_source_code_with_no_code_blocks(self) -> None:
+        text = "Some text without any code blocks"
+        expected_result: list[str] = []
+        result = source_code(text, include_delims=True)
+        self.assertEqual(result, expected_result)