Merge pull request matplotlib#27139 from danielcobej/add_test_axhspan

added test_axhspan in test_datetime.py

Author: ksunden

lib/matplotlib/tests/test_datetime.py

@@ -32,11 +32,42 @@ def test_axhline(self):
         fig, ax = plt.subplots()
         ax.axhline(...)
 
-    @pytest.mark.xfail(reason="Test for axhspan not written yet")
     @mpl.style.context("default")
     def test_axhspan(self):
-        fig, ax = plt.subplots()
-        ax.axhspan(...)
+        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):
+            ax1.axhspan(ymin=i+1, ymax=i+2, facecolor='green', 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):
+            ymin = start_date + datetime.timedelta(days=i)
+            ymax = ymin + datetime.timedelta(days=1)
+            ax2.axhspan(ymin=ymin, ymax=ymax, facecolor='green', 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):
+            ymin = start_date + datetime.timedelta(days=i)
+            ymax = ymin + datetime.timedelta(days=1)
+            ax3.axhspan(ymin=ymin, ymax=ymax, facecolor='green', alpha=0.5)
+        ax3.set_title('Datetime vs. Datetime')
+        ax3.set_xlabel('Date')
+        ax3.set_ylabel('Date')
 
     @pytest.mark.xfail(reason="Test for axline not written yet")
     @mpl.style.context("default")