ceph-volume tests.simple add checks for get_contents in scan

Signed-off-by: Alfredo Deza <adeza@redhat.com>

src/ceph-volume/ceph_volume/tests/devices/simple/test_scan.py

@@ -0,0 +1,19 @@
+from ceph_volume.devices.simple import scan
+
+
+class TestGetContentst(object):
+
+    def test_multiple_lines_are_left_as_is(self, tmpfile):
+        magic_file = tmpfile(contents='first\nsecond\n')
+        scanner = scan.Scan([])
+        assert scanner.get_contents(magic_file) == 'first\nsecond\n'
+
+    def test_extra_whitespace_gets_removed(self, tmpfile):
+        magic_file = tmpfile(contents='first   ')
+        scanner = scan.Scan([])
+        assert scanner.get_contents(magic_file) == 'first'
+
+    def test_single_newline_values_are_trimmed(self, tmpfile):
+        magic_file = tmpfile(contents='first\n')
+        scanner = scan.Scan([])
+        assert scanner.get_contents(magic_file) == 'first'