Respond to review comment

GoogleCloudPlatform · Jun 17, 2015 · 51599c1 · 51599c1
1 parent 56f2d55
commit 51599c1
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/perfkitbenchmarker/virtual_machine.py b/perfkitbenchmarker/virtual_machine.py
@@ -514,10 +514,10 @@ def TimeToBoot(self):
     """Gets the time it took to boot this VM.
 
     Returns:
-      Boot time (in seconds), or None if the boot is incomplete.
+      Boot time (in seconds).
     """
-    if not self.bootable_time or not self.create_start_time:
-      return None
+    assert self.bootable_time, 'VM must have booted to get boot time.'
+    assert self.create_start_time, 'VM must be created to get boot time.'
     assert self.bootable_time >= self.create_start_time
     return self.bootable_time - self.create_start_time