diff --git a/tests/misc_test.py b/tests/misc_test.py
index a4d1e13d..3211a806 100644
--- a/tests/misc_test.py
+++ b/tests/misc_test.py
@@ -12,6 +12,9 @@ def test_obs_errorbar():
         x_obs.append(pe.pseudo_Obs(x, 0.1, "test"))
         y_obs.append(pe.pseudo_Obs(x ** 2, 0.1, "test"))
 
-    pe.errorbar(x_float, y_obs, marker="x", ms=2)
-    pe.errorbar(x_obs, y_obs, marker="x", ms=2)
+    for xerr in [2, None]:
+        for yerr in [0.1, None]:
+            pe.errorbar(x_float, y_obs, marker="x", ms=2, xerr=xerr, yerr=yerr)
+            pe.errorbar(x_obs, y_obs, marker="x", ms=2, xerr=xerr, yerr=yerr)
 
+    plt.close('all')