add simple lvm view tests

I wrote this for another branch then realized it was not of any use for
testing that branch but still worth having

subiquity/ui/views/filesystem/lvm.py

@@ -193,6 +193,7 @@ class VolGroupStretchy(Stretchy):
 
     def done(self, sender):
         result = self.form.as_data()
+        del result['size']
         mdc = self.form.devices.widget
         result['devices'] = mdc.active_devices
         if 'confirm_password' in result:

subiquity/ui/views/filesystem/tests/test_lvm.py

@@ -0,0 +1,84 @@
+# Copyright 2019 Canonical, Ltd.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import unittest
+from unittest import mock
+
+import urwid
+
+from subiquitycore.testing import view_helpers
+from subiquitycore.view import BaseView
+
+from subiquity.controllers.filesystem import FilesystemController
+from subiquity.ui.views.filesystem.lvm import VolGroupStretchy
+from subiquity.ui.views.filesystem.tests.test_partition import (
+    make_model_and_disk,
+    )
+
+
+def make_view(model, existing=None):
+    controller = mock.create_autospec(spec=FilesystemController)
+    base_view = BaseView(urwid.Text(""))
+    base_view.model = model
+    base_view.controller = controller
+    base_view.refresh_model_inputs = lambda: None
+    stretchy = VolGroupStretchy(base_view, existing)
+    base_view.show_stretchy_overlay(stretchy)
+    return base_view, stretchy
+
+
+class LVMViewTests(unittest.TestCase):
+
+    def test_create_vg(self):
+        model, disk = make_model_and_disk()
+        part1 = model.add_partition(disk, 10*(2**30))
+        part2 = model.add_partition(disk, 10*(2**30))
+        view, stretchy = make_view(model)
+        form_data = {
+            'name': 'vg1',
+            'devices': {part1: 'active', part2: 'active'},
+            }
+        expected_data = {
+            'name': 'vg1',
+            'devices': {part1, part2},
+            'encrypt': False,
+            }
+        view_helpers.enter_data(stretchy.form, form_data)
+        view_helpers.click(stretchy.form.done_btn.base_widget)
+        view.controller.volgroup_handler.assert_called_once_with(
+            None, expected_data)
+
+    def test_create_vg_encrypted(self):
+        model, disk = make_model_and_disk()
+        part1 = model.add_partition(disk, 10*(2**30))
+        part2 = model.add_partition(disk, 10*(2**30))
+        view, stretchy = make_view(model)
+        form_data = {
+            'name': 'vg1',
+            'devices': {part1: 'active', part2: 'active'},
+            'encrypt': True,
+            'password': 'passw0rd',
+            'confirm_password': 'passw0rd',
+            }
+        expected_data = {
+            'name': 'vg1',
+            'devices': {part1, part2},
+            'encrypt': True,
+            'password': 'passw0rd',
+            }
+        view_helpers.enter_data(stretchy.form, form_data)
+        view_helpers.click(stretchy.form.done_btn.base_widget)
+        view.controller.volgroup_handler.assert_called_once_with(
+            None, expected_data)