diff --git a/opts_unit_test.go b/opts_unit_test.go
new file mode 100644
index 0000000000..67b061771b
--- /dev/null
+++ b/opts_unit_test.go
@@ -0,0 +1,24 @@
+package docker
+
+import (
+	"testing"
+)
+
+func TestValidateIP4(t *testing.T) {
+	if ret, err := ValidateIp4Address(`1.2.3.4`); err != nil || ret == "" {
+		t.Fatalf("ValidateIp4Address(`1.2.3.4`) got %s %s", ret, err)
+	}
+
+	if ret, err := ValidateIp4Address(`127.0.0.1`); err != nil || ret == "" {
+		t.Fatalf("ValidateIp4Address(`127.0.0.1`) got %s %s", ret, err)
+	}
+
+	if ret, err := ValidateIp4Address(`127`); err == nil || ret != "" {
+		t.Fatalf("ValidateIp4Address(`127`) got %s %s", ret, err)
+	}
+
+	if ret, err := ValidateIp4Address(`random invalid string`); err == nil || ret != "" {
+		t.Fatalf("ValidateIp4Address(`random invalid string`) got %s %s", ret, err)
+	}
+
+}