Generation of sequential and concurrent unit tests to find correctness and performance problems in Java classes
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ConTeGe (short for Concurrent Test Generator) is a framework for generating sequential and concurrent unit tests. It is a research platform to build tools for finding correctness and performance problems in sequential and concurrent Java classes. In particular, ConTeGe is the basis for the following approaches:

An automatic and precise thread safety checker that found previously unknown bugs in the JDK

See for details.

Fully Automatic and Precise Detection of Thread Safety Violations
by Michael Pradel and Thomas R. Gross
at Conference on Programming Language Design and Implementation (PLDI), 2012

An approach for automatic substitutability testing that finds various bugs in widely used Java classes

See this page for details.

Automatic Testing of Sequential and Concurrent Substitutability
by Michael Pradel and Thomas R. Gross
at International Conference on Software Engineering (ICSE), 2013

SpeedGun, a performance regression testing tool for thread-safe classes

See the SpeedGun branch for details.

Performance Regression Testing of Concurrent Classes
by Michael Pradel, Markus Huggler, and Thomas R. Gross
at International Symposium on Software Testing and Analysis (ISSTA), 2014