<expected> file. This behaves like "cmp" but produces more
helpful output when the test is run with "-v" option.
+ - test_line_count (= | -lt | -ge | ...) <length> <file>
+
+ Check whether a file has the length it is expected to.
+
- test_path_is_file <file> [<diagnosis>]
test_path_is_dir <dir> [<diagnosis>]
test_path_is_missing <path> [<diagnosis>]