fix and add test

hvplot/converter.py

@@ -2380,9 +2380,8 @@ def hist(self, x=None, y=None, data=None):
                 .opts(compat_opts, backend=self._backend_compat)
             )
 
-        if 'bin_range' not in self.kwds and 'axiswise' not in self._norm_opts:
+        if 'bin_range' not in self.kwds and not self._norm_opts.get('axiswise'):
             ranges = []
-            ymin, ymax = ys.min(), ys.max()
             for col in y:
                 ys = data[col]
                 ymin, ymax = (ys.min(), ys.max())

hvplot/tests/testcharts.py

@@ -321,6 +321,22 @@ def test_histogram_wide_set_group_label(self):
         plot = self.df.hvplot.hist(group_label='Test')
         assert plot.kdims[0].name == 'Test'
 
+    def test_histogram_subplots_no_shared_axes(self):
+        plots = self.df.hvplot.hist(subplots=True, shared_axes=False)
+        plot_0 = plots.grid_items()[0, 0][1]
+        plot_1 = plots.grid_items()[0, 1][1]
+        assert not plot_0.opts['axiswise']
+        assert plot_0.range('x') == (1, 5)
+        assert plot_1.range('y') == (2, 6)
+
+    def test_histogram_subplots_shared_axes(self):
+        plots = self.df.hvplot.hist(subplots=True, shared_axes=True)
+        plot_0 = plots.grid_items()[0, 0][1]
+        plot_1 = plots.grid_items()[0, 1][1]
+        assert plot_0.opts['axiswise']
+        assert plot_0.range('x') == (1, 6)
+        assert plot_1.range('y') == (1, 6)
+
     def test_scatter_color_internally_set_to_dim(self):
         altered_df = self.cat_df.copy().rename(columns={'category': 'red'})
         plot = altered_df.hvplot.scatter('x', 'y', c='red')