Demo crash on false precondition

jamesd · Apr 29, 2016 · d411fc1 · d411fc1
1 parent be85edd
commit d411fc1
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/commands/commands_test.go b/commands/commands_test.go
@@ -58,6 +58,9 @@ var DecCommand = &commands.ProtoCommand{
 		systemUnderTest.(*counter).Dec()
 		return nil
 	},
+	PreConditionFunc: func(state commands.State) bool {
+		return state.(int) > 0
+	},
 	NextStateFunc: func(state commands.State) commands.State {
 		return state.(int) - 1
 	},