✨ feat(tests): add test_function.py with test cases for subtitle_utils

The commit adds a new file, test_function.py, which contains test cases for the functions in the subtitle_utils module. The tests include checking the show list and the srt2ass method.

tests/test_function.py

@@ -0,0 +1,21 @@
+from subtitle_utils import show_available, get_method
+
+
+def get_test_subtitle(pre, aft):
+    with open(f"test.{pre}", "r") as f:
+        pre_content = f.read()
+    with open(f"test.{aft}", "r") as f:
+        aft_content = f.read()
+    return pre_content, aft_content
+
+
+def test_show_available():
+    assert isinstance(show_available()[0], str), "Error Checking show list"
+
+
+def test_srt2ass():
+    with open("test.bcc", "r") as f:
+        bcc_exp = f.read()
+    with open("test.srt", 'r') as file_io:
+        test_result = get_method(method="srt2ass")(content=file_io)
+        assert test_result == bcc_exp, f"Error Checking srt2ass \n{test_result}"