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xCover is a C/C++ library to detect code coverage in a code base at runtime

Java tools


EMMA is an open-source toolkit for measuring and reporting Java code coverage. EMMA distinguishes itself from other tools by going after a unique feature combination: support for large-scale enterprise software development while keeping individual developer's work fast and iterative
  • EMMA can instrument classes for coverage either offline (before they are loaded) or on the fly (using an instrumenting application classloader).
  • Supported coverage types: class, method, line, basic block. EMMA can detect when a single source code line is covered only partially.
  • Coverage stats are aggregated at method, class, package, and "all classes" levels.
  • Output report types: plain text, HTML, XML. All report types support drill-down, to a user-controlled detail depth. The HTML report supports source code linking.
  • EMMA is quite fast: the runtime overhead of added instrumentation is small (5-20%) and the bytecode instrumentor itself is very fast (mostly limited by file I/O speed). Memory overhead is a few hundred bytes per Java class.
  • EMMA is 100% pure Java, has no external library dependencies, and works in any Java 2 JVM (even 1.2.x).
EclEmma is a free Java code coverage tool for Eclipse, available under the Eclipse Public License. Internally it is based on the great EMMA Java code coverage tool, trying to adopt EMMA's philosophy for the Eclipse workbench
Coverlipse is an Eclipse plugin that visualizes the code coverage of JUnit Tests. It is unique for it integrates seamlessly in Eclipse. The coverage results are given directly after a JUnit run. This makes it the perfect tool for developers to recognize their tests fullfil their task. 
Cobertura is a free Java tool that calculates the percentage of code accessed by tests. It can be used to identify which parts of your Java program are lacking test coverage. It is based on jcoverage
  • Can be executed from ant or from the command line.
  • Instruments Java bytecode after it has been compiled.
  • Can generate reports in HTML or XML.
  • Shows the percentage of lines and branches covered for each class, each package, and for the overall project.
  • Shows the McCabe cyclomatic code complexity of each class, and the average cyclomatic code complexity for each package, and for the overall product.
  • Can sort HTML results by class name, percent of lines covered, percent of branches covered, etc. And can sort in ascending or decending order.
CodeCover is a free glass-box testing tool developed in 2007 at the University of Stuttgart . The glass-box test shows the program elements which were not executed.
  • Statement coverage
  • Branch coverage
  • Term Coverage
  • Loop coverage
  • Question mark operator (?) Coverage
  • Synchronized Coverage
Quilt is a Java software development tool that measures coverage , the extent to which unit testing exercises the software under test. It is optimized for use with the JUnit unit test package, the Ant Java build facility, and the Maven project management toolkit
Generic framework that enables the collection of various kinds of runtime information, such as data about the execution of various code entities and constructs. The framework lets users easily define how to process the collected information and is extensible to collect new types of information. The plug-ins provide an intuitive GUI through which the functionality of the framework can be exploited.

.Net tools

NCover - A test code coverage tool for C# .NET
  • Simplicity
  • Speed - it doesn't profile, it just checks coverage.
  • Designed to be dropped into a continuous build cycle
  • Keep line numbers the same -> Test failure stacktraces stay useful
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