diff --git a/mux_test.go b/mux_test.go
new file mode 100644
index 0000000..391bee7
--- /dev/null
+++ b/mux_test.go
@@ -0,0 +1,40 @@
+package smux
+
+import "testing"
+
+func TestConfig(t *testing.T) {
+	VerifyConfig(DefaultConfig())
+
+	config := DefaultConfig()
+	config.KeepAliveInterval = 0
+	err := VerifyConfig(config)
+	t.Log(err)
+	if err == nil {
+		t.Fatal(err)
+	}
+
+	config = DefaultConfig()
+	config.KeepAliveInterval = 10
+	config.KeepAliveTimeout = 5
+	err = VerifyConfig(config)
+	t.Log(err)
+	if err == nil {
+		t.Fatal(err)
+	}
+
+	config = DefaultConfig()
+	config.MaxFrameSize = 0
+	err = VerifyConfig(config)
+	t.Log(err)
+	if err == nil {
+		t.Fatal(err)
+	}
+
+	config = DefaultConfig()
+	config.MaxFrameTokens = 0
+	err = VerifyConfig(config)
+	t.Log(err)
+	if err == nil {
+		t.Fatal(err)
+	}
+}