added unit tests

tests/drawing/test_draw.py

@@ -514,7 +514,7 @@ def test_draw_multilayer(edgelist8):
     # node_size
     assert np.all(node_coll4.get_sizes() == np.array([10**2]))
 
-    plt.close()
+    plt.close("all")
 
 
 def test_draw_dihypergraph(diedgelist2, edgelist8):
@@ -587,16 +587,14 @@ def test_draw_dihypergraph(diedgelist2, edgelist8):
     for patch in ax1.patches:  # lines
         assert patch.get_zorder() == 0
 
-    plt.close("all")
-
     # test toggle for edges
     fig, ax2 = plt.subplots()
     ax2, collections = xgi.draw_dihypergraph(DH, edge_marker_toggle=False, ax=ax2)
     node_coll, phantom_node_coll = collections
     assert len(ax2.collections) == 1
     assert phantom_node_coll is None
 
-    plt.close()
+    plt.close("all")
 
     # test XGI ERROR raise
     with pytest.raises(XGIError):
@@ -622,3 +620,18 @@ def test_draw_dihypergraph_with_str_labels_and_isolated_nodes():
     assert len(node_coll4.get_offsets()) == 6  # number of original nodes
     assert len(phantom_node_coll4.get_offsets()) == 2  # number of original edges
     assert len(ax4.patches) == 7  # number of lines
+    plt.close()
+
+
+def test_issue_499(edgelist8):
+    H = xgi.Hypergraph(edgelist8)
+
+    fig, ax = plt.subplots()
+    with pytest.warns(None) as record:
+        ax, collections = xgi.draw(H, ax=ax, node_fc="black")
+    assert len(record) == 0
+
+    with pytest.warns(None) as record:
+        ax, collections = xgi.draw(H, ax=ax, node_fc=["black"] * H.num_nodes)
+    assert len(record) == 0
+    plt.close("all")