Remove test_spy from test_datetime.py (matplotlib#27392)

* added test case for spy plot

* adding datetime functionality

* removing plt.show()

* removing spy test

Author: rawwash

lib/matplotlib/tests/test_datetime.py

@@ -510,12 +510,6 @@ def test_semilogy(self):
         fig, ax = plt.subplots()
         ax.semilogy(...)
 
-    @pytest.mark.xfail(reason="Test for spy not written yet")
-    @mpl.style.context("default")
-    def test_spy(self):
-        fig, ax = plt.subplots()
-        ax.spy(...)
-
     @mpl.style.context("default")
     def test_stackplot(self):
         mpl.rcParams["date.converter"] = 'concise'