Implements ParseNetwork unit test.

This commit implements a unit test that validates the `ParseNetwork(std::string)` implementation in `netbase.cpp`.

src/test/netbase_tests.cpp

@@ -302,4 +302,22 @@ BOOST_AUTO_TEST_CASE(netbase_getgroup)
     BOOST_CHECK(CreateInternal("baz.net").GetGroup() == internal_group);
 }
 
+BOOST_AUTO_TEST_CASE(netbase_parsenetwork)
+{
+    BOOST_CHECK_EQUAL(ParseNetwork("ipv4"), NET_IPV4);
+    BOOST_CHECK_EQUAL(ParseNetwork("ipv6"), NET_IPV6);
+    BOOST_CHECK_EQUAL(ParseNetwork("onion"), NET_ONION);
+    BOOST_CHECK_EQUAL(ParseNetwork("tor"), NET_ONION);
+
+    BOOST_CHECK_EQUAL(ParseNetwork("IPv4"), NET_IPV4);
+    BOOST_CHECK_EQUAL(ParseNetwork("IPv6"), NET_IPV6);
+    BOOST_CHECK_EQUAL(ParseNetwork("ONION"), NET_ONION);
+    BOOST_CHECK_EQUAL(ParseNetwork("TOR"), NET_ONION);
+
+    BOOST_CHECK_EQUAL(ParseNetwork(":)"), NET_UNROUTABLE);
+    BOOST_CHECK_EQUAL(ParseNetwork("tÖr"), NET_UNROUTABLE);
+    BOOST_CHECK_EQUAL(ParseNetwork("\xfe\xff"), NET_UNROUTABLE);
+    BOOST_CHECK_EQUAL(ParseNetwork(""), NET_UNROUTABLE);
+}
+
 BOOST_AUTO_TEST_SUITE_END()