p2p/enode, p2p/discv5: fix URL parsing test for go 1.12.8 (#19963)

p2p/discv5/node_test.go

@@ -152,7 +152,7 @@ func TestParseNode(t *testing.T) {
 			if err == nil {
 				t.Errorf("test %q:\n  got nil error, expected %#q", test.rawurl, test.wantError)
 				continue
-			} else if err.Error() != test.wantError {
+			} else if !strings.Contains(err.Error(), test.wantError) {
 				t.Errorf("test %q:\n  got error %#q, expected %#q", test.rawurl, err.Error(), test.wantError)
 				continue
 			}

p2p/enode/urlv4_test.go

@@ -162,7 +162,7 @@ func TestParseNode(t *testing.T) {
 			if err == nil {
 				t.Errorf("test %q:\n  got nil error, expected %#q", test.input, test.wantError)
 				continue
-			} else if err.Error() != test.wantError {
+			} else if !strings.Contains(err.Error(), test.wantError) {
 				t.Errorf("test %q:\n  got error %#q, expected %#q", test.input, err.Error(), test.wantError)
 				continue
 			}