Merge pull request matplotlib#27130 from danielcobej/add_axvspan

added test_axvspan in test.datetime.py

Author: scottshambaugh

lib/matplotlib/tests/test_datetime.py

@@ -81,11 +81,42 @@ def test_axvline(self):
         fig, ax = plt.subplots()
         ax.axvline(...)
 
-    @pytest.mark.xfail(reason="Test for axvspan not written yet")
     @mpl.style.context("default")
     def test_axvspan(self):
-        fig, ax = plt.subplots()
-        ax.axvspan(...)
+        mpl.rcParams["date.converter"] = 'concise'
+
+        start_date = datetime.datetime(2023, 1, 1)
+        dates = [start_date + datetime.timedelta(days=i) for i in range(31)]
+        numbers = list(range(1, 32))
+
+        fig, (ax1, ax2, ax3) = plt.subplots(3, 1,
+                                            constrained_layout=True,
+                                            figsize=(10, 12))
+
+        ax1.plot(dates, numbers, marker='o', color='blue')
+        for i in range(0, 31, 2):
+            xmin = start_date + datetime.timedelta(days=i)
+            xmax = xmin + datetime.timedelta(days=1)
+            ax1.axvspan(xmin=xmin, xmax=xmax, facecolor='red', alpha=0.5)
+        ax1.set_title('Datetime vs. Number')
+        ax1.set_xlabel('Date')
+        ax1.set_ylabel('Number')
+
+        ax2.plot(numbers, dates, marker='o', color='blue')
+        for i in range(0, 31, 2):
+            ax2.axvspan(xmin=i+1, xmax=i+2, facecolor='red', alpha=0.5)
+        ax2.set_title('Number vs. Datetime')
+        ax2.set_xlabel('Number')
+        ax2.set_ylabel('Date')
+
+        ax3.plot(dates, dates, marker='o', color='blue')
+        for i in range(0, 31, 2):
+            xmin = start_date + datetime.timedelta(days=i)
+            xmax = xmin + datetime.timedelta(days=1)
+            ax3.axvspan(xmin=xmin, xmax=xmax, facecolor='red', alpha=0.5)
+        ax3.set_title('Datetime vs. Datetime')
+        ax3.set_xlabel('Date')
+        ax3.set_ylabel('Date')
 
     @pytest.mark.xfail(reason="Test for bar not written yet")
     @mpl.style.context("default")