NDLI: Empirically revisiting the test independence assumption

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Empirically revisiting the test independence assumption

Content Provider	ACM Digital Library
Author	Muşlu, Kıvanç Notkin, David Lam, Wing Ernst, Michael D. Jalali, Darioush Wuttke, Jochen Zhang, Sai
Abstract	In a test suite, all the test cases should be independent: no test should affect any other test’s result, and running the tests in any order should produce the same test results. Techniques such as test prioritization generally assume that the tests in a suite are independent. Test dependence is a little-studied phenomenon. This paper presents five results related to test dependence. First, we characterize the test dependence that arises in practice. We studied 96 real-world dependent tests from 5 issue tracking systems. Our study shows that test dependence can be hard for programmers to identify. It also shows that test dependence can cause non-trivial consequences, such as masking program faults and leading to spurious bug reports. Second, we formally define test dependence in terms of test suites as ordered sequences of tests along with explicit environments in which these tests are executed. We formulate the problem of detecting dependent tests and prove that a useful special case is NP-complete. Third, guided by the study of real-world dependent tests, we propose and compare four algorithms to detect dependent tests in a test suite. Fourth, we applied our dependent test detection algorithms to 4 real-world programs and found dependent tests in each human-written and automatically-generated test suite. Fifth, we empirically assessed the impact of dependent tests on five test prioritization techniques. Dependent tests affect the output of all five techniques; that is, the reordered suite fails even though the original suite did not. .
Starting Page	385
Ending Page	396
Page Count	12
File Format	PDF
ISBN	9781450326452
DOI	10.1145/2610384.2610404
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2014-07-21
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Empirical studies Test dependence Detection algorithms
Content Type	Text
Resource Type	Article

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