add tests for utils function

tests/utils/test_files.py

@@ -6,6 +6,7 @@
 from cg.utils.files import (
     get_directories_in_path,
     get_file_in_directory,
+    get_file_with_pattern_from_list,
     get_files_in_directory_with_pattern,
     get_files_matching_pattern,
     get_source_creation_time_stamp,
@@ -25,6 +26,30 @@ def test_get_file_in_directory(nested_directory_with_file: Path, some_file: str)
     assert file_path.exists()
 
 
+def test_get_file_with_pattern_from_list():
+    """Test that a file is extracted from a list by pattern."""
+    # GIVEN a list of files and a pattern found in one of the files
+    files = [Path("file1.txt"), Path("file2.txt"), Path("file3.txt")]
+
+    # WHEN getting a file by the pattern
+    file = get_file_with_pattern_from_list(files, "file2")
+
+    # THEN assert that the file is returned
+    assert file == Path("file2.txt")
+
+
+def test_get_file_with_pattern_from_list_no_file():
+    """Test that a file is extracted from a list by pattern."""
+    # GIVEN a list of files and a pattern not found in any of the files
+    files = [Path("file1.txt"), Path("file2.txt"), Path("file3.txt")]
+
+    # WHEN getting a file by the pattern
+
+    # THEN a FileNotFoundError should be raised
+    with pytest.raises(FileNotFoundError):
+        get_file_with_pattern_from_list(files, "file4")
+
+
 def test_get_files_in_directory_by_pattern(nested_directory_with_file: Path, some_file: str):
     """Test function to get files with a pattern in a directory and subdirectories."""
     # GIVEN a directory with subdirectories with a file