test: Add test for getting root block device

tests/test_block_device_utils.py

@@ -488,3 +488,21 @@ def test_get_block_devices_by_mountpoint(lsblk_full_mock, authorized_client):
 def test_get_block_devices_by_mountpoint_no_match(lsblk_full_mock, authorized_client):
     block_devices = BlockDevices().get_block_devices_by_mountpoint("/foo")
     assert len(block_devices) == 0
+
+
+def test_get_root_block_device(lsblk_full_mock, authorized_client):
+    block_device = BlockDevices().get_root_block_device()
+    assert block_device is not None
+    assert block_device.name == "sda1"
+    assert block_device.path == "/dev/sda1"
+    assert block_device.fsavail == "4605702144"
+    assert block_device.fssize == "19814920192"
+    assert block_device.fstype == "ext4"
+    assert block_device.fsused == "14353719296"
+    assert block_device.mountpoints == ["/nix/store", "/"]
+    assert block_device.label is None
+    assert block_device.uuid == "ec80c004-baec-4a2c-851d-0e1807135511"
+    assert block_device.size == "20210236928"
+    assert block_device.model is None
+    assert block_device.serial is None
+    assert block_device.type == "part"