NetworkInterface class is working.

tests/src/network_interface.cpp

@@ -0,0 +1,58 @@
+#include <gtest/gtest.h>
+#include <string>
+#include "network_interface.h"
+#include "utils.h"
+
+using namespace Tins;
+
+class NetworkInterfaceTest : public ::testing::Test {
+public:
+    static const std::string iface_name, iface_addr;
+};
+
+const std::string NetworkInterfaceTest::iface_name("lo"),
+                  NetworkInterfaceTest::iface_addr("");
+
+
+TEST_F(NetworkInterfaceTest, ConstructorFromString) {
+    // just test this doesn't throw
+    NetworkInterface iface(iface_name);
+    
+    try {
+        NetworkInterface iface("ishallnotexist");
+        ASSERT_TRUE(false);
+    }
+    catch(...) {
+        
+    }
+}
+
+TEST_F(NetworkInterfaceTest, ConstructorFromIp) {
+    NetworkInterface iface(IPv4Address("127.0.0.1"));
+    EXPECT_EQ(iface.name(), "lo");
+}
+
+TEST_F(NetworkInterfaceTest, Id) {
+    NetworkInterface iface(iface_name);
+    EXPECT_TRUE(iface.id() != 0);
+}
+
+TEST_F(NetworkInterfaceTest, Info) {
+    NetworkInterface iface(iface_name);
+    NetworkInterface::Info info(iface.addresses());
+    // assuming it's like this
+    EXPECT_EQ(info.ip_addr, "127.0.0.1");
+    EXPECT_EQ(info.netmask, "255.0.0.0");
+}
+
+TEST_F(NetworkInterfaceTest, EqualsOperator) {
+    NetworkInterface iface1(iface_name), iface2(iface_name);
+    EXPECT_EQ(iface1, iface2);
+}
+
+TEST_F(NetworkInterfaceTest, DistinctOperator) {
+    NetworkInterface iface1(iface_name), iface2("eth0");
+    EXPECT_NE(iface1, iface2);
+}
+
+