Added test for Axes.bar_label (matplotlib#27431)

* Added test for Axes.bar_label

* Added test for Axes.bar_label after fixing typos

* Added test for Axes.bar_label after fixing typos

* Added test for Axes.bar_label after fixing typos

* Updated code based on review

* Update test_datetime.py

* removed the .show line and added bar_label back

* added bar_label, removed show, fixed linting issues

* Update lib/matplotlib/tests/test_datetime.py

Changed axs to ax

Co-authored-by: Elliott Sales de Andrade <[email protected]>

Author: KheshavKumar

lib/matplotlib/tests/test_datetime.py

@@ -163,11 +163,20 @@ def test_bar(self):
         ax1.bar(x_dates, x_ranges, width=np.timedelta64(4, "D"))
         ax2.bar(np.arange(4), x_dates - x, bottom=x)
 
-    @pytest.mark.xfail(reason="Test for bar_label not written yet")
     @mpl.style.context("default")
     def test_bar_label(self):
-        fig, ax = plt.subplots()
-        ax.bar_label(...)
+        # Generate some example data with dateTime inputs
+        date_list = [datetime.datetime(2023, 1, 1) +
+                     datetime.timedelta(days=i) for i in range(5)]
+        values = [10, 20, 15, 25, 30]
+
+        # Creating the plot
+        fig, ax = plt.subplots(1, 1, figsize=(10, 8), layout='constrained')
+        bars = ax.bar(date_list, values)
+
+        # Add labels to the bars using bar_label
+        ax.bar_label(bars, labels=[f'{val}%' for val in values],
+                     label_type='edge', color='black')
 
     @mpl.style.context("default")
     def test_barbs(self):