Added usbcommon_test.go

usbcommon_test.go

@@ -0,0 +1,109 @@
+/* ipp-usb - HTTP reverse proxy, backed by IPP-over-USB connection to device
+ *
+ * Copyright (C) 2020 and up by Alexander Pevzner (pzz@apevzner.com)
+ * See LICENSE for license terms and conditions
+ *
+ * Tests for usbcommon.go
+ */
+
+package main
+
+import (
+	"testing"
+)
+
+// Check if two UsbAddrList are equal
+func equalUsbAddrList(l1, l2 UsbAddrList) bool {
+	if len(l1) != len(l2) {
+		return false
+	}
+
+	for i := range l1 {
+		if l1[i] != l2[i] {
+			return false
+		}
+	}
+
+	return true
+}
+
+// Make UsbAddrList from individual addresses
+func makeUsbAddrList(addrs ...UsbAddr) UsbAddrList {
+	l := UsbAddrList{}
+
+	for _, a := range addrs {
+		l.Add(a)
+	}
+
+	return l
+}
+
+// Test (*UsbAddrList)Add() against (*UsbAddrList)Find()
+func TestUsbAddrListAddFind(t *testing.T) {
+	a1 := UsbAddr{0, 1}
+	a2 := UsbAddr{0, 2}
+	a3 := UsbAddr{0, 3}
+
+	l1 := makeUsbAddrList(a1, a2)
+
+	if l1.Find(a1) < 0 {
+		t.Fail()
+	}
+
+	if l1.Find(a2) < 0 {
+		t.Fail()
+	}
+
+	if l1.Find(a3) >= 0 {
+		t.Fail()
+	}
+}
+
+// Test that (*UsbAddrList)Add() is commutative operation
+func TestUsbAddrListAddCommutative(t *testing.T) {
+	a1 := UsbAddr{0, 1}
+	a2 := UsbAddr{0, 2}
+
+	l1 := UsbAddrList{}
+	l2 := UsbAddrList{}
+
+	l1.Add(a1)
+	l1.Add(a2)
+
+	l2.Add(a2)
+	l2.Add(a1)
+
+	if !equalUsbAddrList(l1, l2) {
+		t.Fail()
+	}
+}
+
+// Test (*UsbAddrList) Diff()
+func TestUsbAddrListDiff(t *testing.T) {
+	a1 := UsbAddr{0, 1}
+	a2 := UsbAddr{0, 2}
+	a3 := UsbAddr{0, 3}
+
+	l1 := makeUsbAddrList(a2, a3)
+	l2 := makeUsbAddrList(a1, a3)
+
+	added, removed := l1.Diff(l2)
+
+	if !equalUsbAddrList(added, makeUsbAddrList(a1)) {
+		t.Fail()
+	}
+
+	if !equalUsbAddrList(removed, makeUsbAddrList(a2)) {
+		t.Fail()
+	}
+
+	added, removed = l2.Diff(l1)
+
+	if !equalUsbAddrList(removed, makeUsbAddrList(a1)) {
+		t.Fail()
+	}
+
+	if !equalUsbAddrList(added, makeUsbAddrList(a2)) {
+		t.Fail()
+	}
+}