def METHOD_NAME(self):
    """Test that resolution tests runs without nprocs and plots to file"""
    benchmarks = [
        dict(
            module=Module("r.univar", map="elevation", stdout_=DEVNULL, run_=False),
            label="Standard output",
        ),
        dict(
            module=Module(
                "r.univar", map="elevation", flags="g", stdout_=DEVNULL, run_=False
            ),
            label="Standard output",
        ),
    ]
    resolutions = [300, 200, 100]
    results = []
    for benchmark in benchmarks:
        results.append(
            benchmark_resolutions(
                **benchmark,
                resolutions=resolutions,
            )
        )
    plot_file = "test_res_plot.png"
    num_cells_plot(results, filename=plot_file)
    self.assertTrue(Path(plot_file).is_file())