net: dhcp6: Add a sandbox test for dhcp6

Requires proper environment with DHCP6 server provisioned.

Signed-off-by: Sean Edmond <seanedmond@microsoft.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>

test/py/tests/test_net.py

@@ -29,6 +29,11 @@ env__net_uses_pci = True
 # set to False.
 env__net_dhcp_server = True
 
+# True if a DHCPv6 server is attached to the network, and should be tested.
+# If DHCPv6 testing is not possible or desired, this variable may be omitted or
+# set to False.
+env__net_dhcp6_server = True
+
 # A list of environment variables that should be set in order to configure a
 # static IP. If solely relying on DHCP, this variable may be omitted or set to
 # an empty list.
@@ -58,6 +63,7 @@ env__net_nfs_readable_file = {
 """
 
 net_set_up = False
+net6_set_up = False
 
 def test_net_pre_commands(u_boot_console):
     """Execute any commands required to enable network hardware.
@@ -93,6 +99,25 @@ def test_net_dhcp(u_boot_console):
     global net_set_up
     net_set_up = True
 
+@pytest.mark.buildconfigspec('cmd_dhcp6')
+def test_net_dhcp6(u_boot_console):
+    """Test the dhcp6 command.
+
+    The boardenv_* file may be used to enable/disable this test; see the
+    comment at the beginning of this file.
+    """
+
+    test_dhcp6 = u_boot_console.config.env.get('env__net_dhcp6_server', False)
+    if not test_dhcp6:
+        pytest.skip('No DHCP6 server available')
+
+    u_boot_console.run_command('setenv autoload no')
+    output = u_boot_console.run_command('dhcp6')
+    assert 'DHCP6 client bound to ' in output
+
+    global net6_set_up
+    net6_set_up = True
+
 @pytest.mark.buildconfigspec('net')
 def test_net_setup_static(u_boot_console):
     """Set up a static IP configuration.