Add unit tests for configuration, cryptography, interfaces, and packet handling.

pkg/interfaces/tcp_test.go

@@ -0,0 +1,52 @@
+package interfaces
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestEscapeHDLC(t *testing.T) {
+	testCases := []struct {
+		name     string
+		input    []byte
+		expected []byte
+	}{
+		{"NoEscape", []byte{0x01, 0x02, 0x03}, []byte{0x01, 0x02, 0x03}},
+		{"EscapeFlag", []byte{0x01, HDLC_FLAG, 0x03}, []byte{0x01, HDLC_ESC, HDLC_FLAG ^ HDLC_ESC_MASK, 0x03}},
+		{"EscapeEsc", []byte{0x01, HDLC_ESC, 0x03}, []byte{0x01, HDLC_ESC, HDLC_ESC ^ HDLC_ESC_MASK, 0x03}},
+		{"EscapeBoth", []byte{HDLC_FLAG, HDLC_ESC}, []byte{HDLC_ESC, HDLC_FLAG ^ HDLC_ESC_MASK, HDLC_ESC, HDLC_ESC ^ HDLC_ESC_MASK}},
+		{"Empty", []byte{}, []byte{}},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			result := escapeHDLC(tc.input)
+			if !bytes.Equal(result, tc.expected) {
+				t.Errorf("escapeHDLC(%x) = %x; want %x", tc.input, result, tc.expected)
+			}
+		})
+	}
+}
+
+func TestEscapeKISS(t *testing.T) {
+	testCases := []struct {
+		name     string
+		input    []byte
+		expected []byte
+	}{
+		{"NoEscape", []byte{0x01, 0x02, 0x03}, []byte{0x01, 0x02, 0x03}},
+		{"EscapeFEND", []byte{0x01, KISS_FEND, 0x03}, []byte{0x01, KISS_FESC, KISS_TFEND, 0x03}},
+		{"EscapeFESC", []byte{0x01, KISS_FESC, 0x03}, []byte{0x01, KISS_FESC, KISS_TFESC, 0x03}},
+		{"EscapeBoth", []byte{KISS_FEND, KISS_FESC}, []byte{KISS_FESC, KISS_TFEND, KISS_FESC, KISS_TFESC}},
+		{"Empty", []byte{}, []byte{}},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			result := escapeKISS(tc.input)
+			if !bytes.Equal(result, tc.expected) {
+				t.Errorf("escapeKISS(%x) = %x; want %x", tc.input, result, tc.expected)
+			}
+		})
+	}
+}