from testtools.matchers import FileExists def test_file_exists(): filename = "test.txt" directory_path = "/home/user/documents" filepath = f"{directory_path}/{filename}" assert_that(filepath, FileExists())In this example, we check if a file named "test.txt" exists in the directory "/home/user/documents". We use the assert_that method to check if the filepath provided matches the FileExists matcher. The FileExists matcher belongs to the testtools.matchers package library in Python. It is commonly used in test cases to verify if a file is created or updated during the execution of a test.