Add test_bar in test_datetime

Author: kots14

lib/matplotlib/tests/test_datetime.py

@@ -62,11 +62,24 @@ def test_axvspan(self):
         fig, ax = plt.subplots()
         ax.axvspan(...)
 
-    @pytest.mark.xfail(reason="Test for bar not written yet")
     @mpl.style.context("default")
     def test_bar(self):
-        fig, ax = plt.subplots()
-        ax.bar(...)
+        mpl.rcParams["date.converter"] = "concise"
+        range_threshold = 10
+        fig, (ax1, ax2, ax3) = plt.subplots(3, 1, layout="constrained")
+
+        x_dates = np.array(
+            [datetime.datetime(2023, 10, delta) for delta in range(1, range_threshold)]
+        )
+        y_dates = np.array(
+            [datetime.datetime(2023, 10, delta) for delta in range(1, range_threshold)]
+        )
+        x_ranges = np.array(range(1, range_threshold))
+        y_ranges = np.array(range(1, range_threshold))
+
+        ax1.bar(x_dates, y_ranges)
+        ax2.bar(x_dates, y_dates)
+        ax3.bar(x_ranges, y_dates)
 
     @pytest.mark.xfail(reason="Test for bar_label not written yet")
     @mpl.style.context("default")