test: dm: eth: Add tests for the eth dm implementation

Add a test for the eth uclass using the sandbox eth driver. Verify basic
functionality of the network stack / eth uclass by exercising the ping
function.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/test/dm/eth.c b/test/dm/eth.c
new file mode 100644
index 0000000..04ccf49
--- /dev/null
+++ b/test/dm/eth.c
@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2015 National Instruments
+ *
+ * (C) Copyright 2015
+ * Joe Hershberger <joe.hershberger@ni.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dm/test.h>
+#include <dm/ut.h>
+#include <fdtdec.h>
+#include <malloc.h>
+#include <net.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int dm_test_eth(struct dm_test_state *dms)
+{
+	NetPingIP = string_to_ip("1.1.2.2");
+
+	setenv("ethact", "eth@10002000");
+	ut_assertok(NetLoop(PING));
+	ut_asserteq_str("eth@10002000", getenv("ethact"));
+
+	setenv("ethact", "eth@10003000");
+	ut_assertok(NetLoop(PING));
+	ut_asserteq_str("eth@10003000", getenv("ethact"));
+
+	setenv("ethact", "eth@10004000");
+	ut_assertok(NetLoop(PING));
+	ut_asserteq_str("eth@10004000", getenv("ethact"));
+
+	return 0;
+}
+DM_TEST(dm_test_eth, DM_TESTF_SCAN_FDT);