Change plot layout for all datasets visual; check aspect ratio on resulting plot in tests (#279)

Author: stefmolin

src/data_morph/data/loader.py

@@ -136,14 +136,15 @@ def plot_available_datasets(cls) -> Axes:
             The list of available datasets built into Data Morph.
         """
         num_plots = len(cls.AVAILABLE_DATASETS)
-        num_cols = 3
+        num_cols = 4
         num_rows = int(np.ceil(num_plots / num_cols))
+        scale = 4
 
         fig, axs = plt.subplots(
             num_rows,
             num_cols,
             layout='constrained',
-            figsize=(12, 4 * num_rows),
+            figsize=(scale * num_cols, scale * num_rows),
             subplot_kw={'aspect': 'equal'},
         )
         fig.get_layout_engine().set(w_pad=0.2, h_pad=0.2)

tests/data/test_loader.py

@@ -73,3 +73,4 @@ def test_plot_available_datasets(self, monkeypatch, subset):
             assert subplot_title.endswith(' points)')
             if dataset in ['Python', 'SDS']:
                 assert 'logo' in subplot_title
+            assert ax.get_aspect() == 1