diff --git a/lib/matplotlib/tests/test_datetime.py b/lib/matplotlib/tests/test_datetime.py
index ca8e1cb90732..40362ce2c9c7 100644
--- a/lib/matplotlib/tests/test_datetime.py
+++ b/lib/matplotlib/tests/test_datetime.py
@@ -317,11 +317,40 @@ def test_fill_between(self):
fig, ax = plt.subplots()
ax.fill_between(...)
- @pytest.mark.xfail(reason="Test for fill_betweenx not written yet")
@mpl.style.context("default")
def test_fill_betweenx(self):
- fig, ax = plt.subplots()
- ax.fill_betweenx(...)
+ mpl.rcParams["date.converter"] = "concise"
+ np.random.seed(19680801)
+
+ x_base_date = datetime.datetime(2023, 1, 1)
+ x_dates1 = [x_base_date]
+ for i in range(1, 10):
+ x_base_date += datetime.timedelta(days=np.random.randint(1, 5))
+ x_dates1.append(x_base_date)
+
+ x_dates2 = [x_base_date]
+ for i in range(1, 10):
+ x_base_date += datetime.timedelta(days=np.random.randint(1, 5))
+ x_dates2.append(x_base_date)
+ y_values = np.random.rand(10) * 10
+ y_values.sort()
+
+ x_values1 = np.random.rand(10) * 10
+ x_values2 = x_values1 + np.random.rand(10) * 10
+ x_values1.sort()
+ x_values2.sort()
+
+ y_base_date = datetime.datetime(2023, 1, 1)
+ y_dates = [y_base_date]
+ for i in range(1, 10):
+ y_base_date += datetime.timedelta(days=np.random.randint(1, 10))
+ y_dates.append(y_base_date)
+
+ fig, (ax1, ax2, ax3) = plt.subplots(1, 3, layout="constrained")
+
+ ax1.fill_betweenx(y_values, x_dates1, x_dates2)
+ ax2.fill_betweenx(y_dates, x_values1, x_values2)
+ ax3.fill_betweenx(y_dates, x_dates1, x_dates2)
@pytest.mark.xfail(reason="Test for hexbin not written yet")
@mpl.style.context("default")
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