networking: refactor is_physical from cloudinit.net (#457)

As the first refactor PR, this also includes the initial structure for tests.

LP: #1884619

1 files changed, 42 insertions, 0 deletions

diff --git a/cloudinit/distros/tests/test_networking.py b/cloudinit/distros/tests/test_networking.py
new file mode 100644
index 00000000..2acb12f4
--- /dev/null
+++ b/cloudinit/distros/tests/test_networking.py
@@ -0,0 +1,42 @@
+from unittest import mock
+
+import pytest
+
+from cloudinit.distros.networking import BSDNetworking, LinuxNetworking
+
+
+@pytest.yield_fixture
+def sys_class_net(tmpdir):
+    sys_class_net_path = tmpdir.join("sys/class/net")
+    sys_class_net_path.ensure_dir()
+    with mock.patch(
+        "cloudinit.net.get_sys_class_path",
+        return_value=sys_class_net_path.strpath + "/",
+    ):
+        yield sys_class_net_path
+
+
+class TestBSDNetworkingIsPhysical:
+    def test_raises_notimplementederror(self):
+        with pytest.raises(NotImplementedError):
+            BSDNetworking().is_physical("eth0")
+
+
+class TestLinuxNetworkingIsPhysical:
+    def test_returns_false_by_default(self, sys_class_net):
+        assert not LinuxNetworking().is_physical("eth0")
+
+    def test_returns_false_if_devname_exists_but_not_physical(
+        self, sys_class_net
+    ):
+        devname = "eth0"
+        sys_class_net.join(devname).mkdir()
+        assert not LinuxNetworking().is_physical(devname)
+
+    def test_returns_true_if_device_is_physical(self, sys_class_net):
+        devname = "eth0"
+        device_dir = sys_class_net.join(devname)
+        device_dir.mkdir()
+        device_dir.join("device").write("")
+
+        assert LinuxNetworking().is_physical(devname)