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DejaGnu is a framework for testing applications such as Tcl, C, C++, Java, and network applications, and cross testing embedded systems. Its purpose is to provide a single frontend for all tests. Think of it as a custom library of Tcl procedures crafted to support writing a test harness. A "test harness" is the testing infrastructure that is created to support a specific program or tool. Each program can have multiple test suites, all supported by a single test harness. DejaGnu is written in Expect, which in turn uses Tcl, Tool Command Language. There has not been a new release in quite a while, although the snapshots are quite stable.