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Content Provider | ACM Digital Library |
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Author | Saff, David Ernst, Michael D. |
Abstract | Test factoring creates fast, focused unit tests from slow system-wide tests; each new unit test exercises only a subset of the functionality exercised by the system tests. Augmenting a test suite with factored unit tests, and prioritizing the tests, should catch errors earlier in a test run.One way to factor a test is to introduce mock objects. If a test exercises a component A, which is designed to issue queries against or mutate another component B, the implementation of B can be replaced by a mock. The mock has two purposes: it checks that A's calls to B are as expected, and it simulates B's behavior in response. Given a system test for A and B, and a record of A's and B's behavior when the system test is run, we would like to automatically generate unit tests for A in which B is mocked. The factored tests can isolate bugs in A from bugs in B and, if B is slow or expensive, improve test performance or cost.This paper motivates test factoring with an illustrative example, proposes a simple procedure for automatically generating mock objects for factored tests, and gives examples of how the procedure can be extended to produce more robust factored tests. |
Starting Page | 49 |
Ending Page | 51 |
Page Count | 3 |
File Format | |
ISBN | 1581139101 |
DOI | 10.1145/996821.996838 |
Language | English |
Publisher | Association for Computing Machinery (ACM) |
Publisher Date | 2004-06-07 |
Publisher Place | New York |
Access Restriction | Subscribed |
Subject Keyword | Test factoring Unit testing Mock objects |
Content Type | Text |
Resource Type | Article |
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