diff --git a/lib/matplotlib/tests/test_datetime.py b/lib/matplotlib/tests/test_datetime.py
index 104a649e1464..b97cac97af5f 100644
--- a/lib/matplotlib/tests/test_datetime.py
+++ b/lib/matplotlib/tests/test_datetime.py
@@ -5,7 +5,7 @@
import matplotlib.pyplot as plt
import matplotlib as mpl
-
+import matplotlib.tri as tri
class TestDatetimePlotting:
@mpl.style.context("default")
@@ -805,11 +805,42 @@ def test_text(self):
ax3.plot(x_dates, y_dates)
ax3.text(test_date, test_date, "Inserted Text", **font_properties)
- @pytest.mark.xfail(reason="Test for tricontour not written yet")
@mpl.style.context("default")
def test_tricontour(self):
- fig, ax = plt.subplots()
- ax.tricontour(...)
+
+ # make unequailly distributed data points:
+
+ dates = np.arange(np.datetime64('2022-01-01'), np.datetime64('2022-12-28'),
+ np.timedelta64(1,'D'))
+ n = len(dates)
+ np.random.seed(19680801)
+ indx = np.array(np.random.random_sample(n//2)*n, dtype='int')
+ np.random.seed(100)
+ indy = np.array(np.random.random_sample(n//2)*n, dtype='int')
+ x = indx - n/2.
+ y = indy - n/2.
+ z = x**2 + y**2 - x/4.
+ levels = np.linspace(z.min(), z.max(), 5)
+ dates_x = dates[indx]
+ dates_y = dates[indy]
+
+ # plot:
+ fig, (ax0, ax1, ax2) = plt.subplots(1,3, figsize=(20, 5))
+ # dates on y axis
+ ax0.plot(x, dates_y, 'o', markersize=2, color='lightgrey')
+ ax0.tricontour(x, dates_y, z, levels=levels)
+ ax0.tick_params('y',labelrotation=45)
+ # dates on x axis
+ ax1.plot(dates_x, y, 'o', markersize=2, color='lightgrey')
+ ax1.tricontour(dates_x, y, z, levels=levels)
+ ax1.tick_params('x',labelrotation=45)
+ # dates on x and y axes
+ ax2.plot(dates_x, dates_y, 'o', markersize=2, color='lightgrey')
+ ax2.tricontour(dates_x, dates_y, z, levels=levels)
+ ax2.tick_params(labelrotation=45)
+
+ fig.tight_layout()
+ plt.show()
@pytest.mark.xfail(reason="Test for tricontourf not written yet")
@mpl.style.context("default")
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