I can totally do that.

I modeled this test on the test_kde test: 

```python
    @slow
    def test_kde(self):
        _skip_if_no_scipy()
        _check_plot_works(self.ts.plot, kind='kde')
        _check_plot_works(self.ts.plot, kind='density')
        ax = self.ts.plot(kind='kde', logy=True)
        self.assert_(ax.get_yscale() == 'log')

    @slow
    def test_kde_kwargs(self):
        _skip_if_no_scipy()
        from numpy import linspace
        _check_plot_works(self.ts.plot, kind='kde', bw_method=.5, ind=linspace(-100,100,20))
        _check_plot_works(self.ts.plot, kind='density', bw_method=.5, ind=linspace(-100,100,20))
        ax = self.ts.plot(kind='kde', logy=True, bw_method=.5, ind=linspace(-100,100,20))
        self.assert_(ax.get_yscale() == 'log')
```

Will change in both to be consistent, and to add the usefulness you describe to the already existing test as well.