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")