Fixed nil dereferencing and added missing fields validation

src/proxy/fields/stream_port_test.go

@@ -0,0 +1,48 @@
+package fields
+
+import (
+	"testing"
+
+	E "github.com/yusing/go-proxy/error"
+	U "github.com/yusing/go-proxy/utils/testing"
+)
+
+var validPorts = []string{
+	"1234:5678",
+	"0:2345",
+	"2345",
+	"1234:postgres",
+}
+
+var invalidPorts = []string{
+	"",
+	"123:",
+	"0:",
+	":1234",
+	"1234:1234:1234",
+	"qwerty",
+	"asdfgh:asdfgh",
+	"1234:asdfgh",
+}
+
+var outOfRangePorts = []string{
+	"-1:1234",
+	"1234:-1",
+	"65536",
+	"0:65536",
+}
+
+func TestStreamPort(t *testing.T) {
+	for _, port := range validPorts {
+		_, err := ValidateStreamPort(port)
+		U.ExpectNoError(t, err.Error())
+	}
+	for _, port := range invalidPorts {
+		_, err := ValidateStreamPort(port)
+		U.ExpectError2(t, port, E.ErrInvalid, err.Error())
+	}
+	for _, port := range outOfRangePorts {
+		_, err := ValidateStreamPort(port)
+		U.ExpectError2(t, port, E.ErrOutOfRange, err.Error())
+	}
+}