test: add missing helpers.py file

test/helpers.py

@@ -0,0 +1,21 @@
+from data.database import LogEntryKind, LogEntry
+
+class assert_action_logged(object):
+  """ Specialized assertion for ensuring that a log entry of a particular kind was added under the
+      context of this call.
+  """
+  def __init__(self, log_kind):
+    self.log_kind = log_kind
+    self.existing_count = 0
+
+  def _get_log_count(self):
+    return LogEntry.select(LogEntry.kind == LogEntryKind.get(name=self.log_kind)).count()
+
+  def __enter__(self):
+    self.existing_count = self._get_log_count()
+    return self
+
+  def __exit__(self, exc_type, exc_val, exc_tb):
+    updated_count = self._get_log_count()
+    error_msg = 'Missing new log entry of kind %s' % self.log_kind
+    assert self.existing_count == (updated_count - 1), error_msg