Designing the System Tests in VS .NET

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7 Designing the System Tests
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ClickCustomer ; ClickOrders ; EnterOrder ClickCustomer ; ClickOrders ; Quit and so forth. These are the sort of tests that should succeed if the implementation is correct. There are other sequences we should apply, also. These are expected to fail Quit ClickCustomer ; UploadOrder ClickCustomer ; EnterCustomer ; Quit and so forth. These should generate failures during the testing. We need to check these out because it is important that the software does not do anything unexpected; checking that it does what it is supposed to do is only half the story. We also need to show that it doesn t do what it shouldn t do! An issue that arises is that it is not immediately clear how you can apply a test sequence such as ClickCustomer ; UploadOrder as there is no trigger for the second function from the Customers state. In order to do this, we need to introduce some special triggers that access this function from the Customers state but that are only used in testing. This is an example of something that is discussed in Section 7.5. Now we consider the position from the Customers state. We know how to get to this state, and we have to check that only the expected transitions operate from it and these have the right behavior. Thus we will try sequences such as ClickCustomer ; EnterCustomer ; UploadCustomer ClickCustomer ; EnterCustomer ; EnterOrder ClickCustomer ; EnterCustomer ; UploadOrder ClickCustomer ; EnterCustomer ; Quit and so forth. Some of these should succeed, but some should fail. We are trying to apply any operation from any state to prove to us that there are no hidden problems. The system may do things that we are unaware of; if the test ClickCustomer ; EnterCustomer ; Quit does not fail, then we may have some problems with the way that the database is being used. We would only expect the rst test to work, the others should fail.
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7.4.1 An Algorithm for Determining the Transition Cover
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Much of the process for generating and applying test sets to real cases can be automated. We consider the case of constructing the transition cover. We rst build a testing tree with states as node labels and inputs as arc labels.
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7.4 The Thinking Behind the System Test Process
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From each node, there are arcs leaving for each possible input value. The root is labeled with the start state. This is level 0. We now examine the nodes at level m from left to right: If the label at the node is a repeat of an earlier node, then terminate the branch; If the node is labeled unde ned, then terminate that branch. If the label at the node is a state such that an input s is not de ned, then an arc is drawn, labeled by s, to a node labeled unde ned. If an input s leads to a state q0 , then insert an arc, labeled by s, to a node labeled q0 . Beginning at Start, we see that there is an arrow with label ClickCustomer leading to Customers and so we draw a branch of the tree as shown (Fig. 7.15a). There is no arrow leaving Start with the label Quit, so this means that we draw an arrow from Start labeled with Quit to a node labeled unde ned (Fig. 7.15b). There is a label ClickOrder that leads to Orders, and so this is drawn in the tree (Fig. 7.15c). The test sequences we need can be read off as labels of the various paths through the tree. This process continues. It will detect many of the faults in the software, but there are still things we need to do. We need to check that the state that we have reached at
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