Test setting and getting plot resolution

tests/operators/test_plots.py

@@ -255,3 +255,17 @@ def test_scatter_plot_too_many_y_dimensions(
     cube_x = collapse.collapse(vertical_profile_cube, ["time"], "MEAN")[0:4]
     with pytest.raises(ValueError):
         plot.scatter_plot(cube_x, cube_y)
+
+
+def test_get_plot_resolution(tmp_working_dir):
+    """Test getting the plot resolution."""
+    with open("meta.json", "wt", encoding="UTF-8") as fp:
+        fp.write('{"plot_resolution": 72}')
+    resolution = plot._get_plot_resolution()
+    assert resolution == 72
+
+
+def test_get_plot_resolution_unset(tmp_working_dir):
+    """Test getting the default plot resolution when unset."""
+    resolution = plot._get_plot_resolution()
+    assert resolution == 100

tests/test_run_recipes.py

@@ -94,3 +94,11 @@ def test_run_steps_style_file_metadata_written(tmp_path: Path):
     with open(tmp_path / "meta.json", "rb") as fp:
         metadata = json.load(fp)
     assert metadata["style_file_path"] == style_file_path
+
+
+def test_run_steps_plot_resolution_metadata_written(tmp_path: Path):
+    """Style file path metadata written out."""
+    CSET.operators._run_steps({}, [], None, tmp_path, plot_resolution=72)
+    with open(tmp_path / "meta.json", "rb") as fp:
+        metadata = json.load(fp)
+    assert metadata["plot_resolution"] == 72