Assert File Size
Checks that a regular file exists and has the expected size in bytes.
path (String): The file path to
check.
size (Int): The expected size in
bytes.
message (String): (Optional) Custom
assertion message.
True if the file exists and has the expected size.
assert_size_of_file("output.csv", 128)
assert_size_of_file("report.html", 0, "report should be empty")