Add test_bxp in test_datetime.py (matplotlib#27390)

* added test case for test_bxp

* adding datetime functionality

* removing plt.show()

Author: rawwash

lib/matplotlib/tests/test_datetime.py

@@ -237,11 +237,24 @@ def test_broken_barh(self):
                          (datetime.datetime(2023, 1, 4), datetime.timedelta(days=4))],
                          (20, 9), facecolors=('tab:red'))
 
-    @pytest.mark.xfail(reason="Test for bxp not written yet")
     @mpl.style.context("default")
     def test_bxp(self):
+        mpl.rcParams["date.converter"] = 'concise'
         fig, ax = plt.subplots()
-        ax.bxp(...)
+        data = [{
+            "med": datetime.datetime(2020, 1, 15),
+            "q1": datetime.datetime(2020, 1, 10),
+            "q3": datetime.datetime(2020, 1, 20),
+            "whislo": datetime.datetime(2020, 1, 5),
+            "whishi": datetime.datetime(2020, 1, 25),
+            "fliers": [
+                datetime.datetime(2020, 1, 3),
+                datetime.datetime(2020, 1, 27)
+            ]
+        }]
+        ax.bxp(data, vert=False)
+        ax.xaxis.set_major_formatter(mpl.dates.DateFormatter("%Y-%m-%d"))
+        ax.set_title('Box plot with datetime data')
 
     @pytest.mark.xfail(reason="Test for clabel not written yet")
     @mpl.style.context("default")