JSCoverage
code coverage for JavaScript

News

October 2, 2012 - JSCover 0.0.1

The next generation JavaScript code coverage program has been released on GitHub.

Any future development of the JSCoverage code base will likely occur in the new JSCover project on GitHub, which reuses a substantial amount of JSCoverage code and aims for a high degree of backward compatibility with JSCoverage. JSCoverage itself is unlikely to have any further releases.

September 23, 2010 - JSCoverage 0.5.1

JSCoverage 0.5.1 is available for download.

This release contains several bug fixes and improvements:

• Probably the largest change is in the documentation: the manual no longer recommends using file: URLs. It is recommended that an HTTP server be used instead. (See the manual for details.) The JSCoverage user interface now displays a warning when used with file: URLs.
• The --verbose option to jscoverage now produces better output.
• Report loading is now faster (thanks to Klaus).
• Some bugs involving augmented object prototypes were fixed.
• JavaScript instrumentation was improved to work better in non-browser environments.
• Some cases where permission errors were occurring in inverted mode were fixed (thanks to tn).
• Previously, if jscoverage-server was started with the option --ip-address=A, where A was a specific IP address, it was impossible to shut it down with jscoverage-server --shutdown. This should be possible now by running jscoverage-server --shutdown --ip-address=A from the same machine.
• The test suite has been made more robust.

April 26, 2010 - New blog

If you would like to see some case studies showing how to use JSCoverage in practice, take a look at the new blog. This week there will be a series of articles about using JSCoverage with various JavaScript testing frameworks. The first article looks at using JSCoverage with the script.aculo.us test suite.

April 24, 2010 - JSCoverage 0.5

JSCoverage 0.5 is available for download.

This release contains a number of new features and bug fixes:

• A new mode of operation, called "window mode", allows you to run code in a new browser window (or tab).
• Code coverage statistics can now be generated for applications based on the Mozilla platform using the --mozilla option (thanks to Murali Nandigama for help creating this).
• The method used to calculate overall percentage code coverage for all files has changed. Previously, the calculation was done using an unweighted average: each file's percentage code coverage contributed equally to the total, regardless of the number of lines of code in the file. Now, the calculation is done using a weighted average. This fixes bug #6 (thanks to Liu Cougar).
• Contiguous lines in the "Missing" column are now grouped together (thanks to Liu Cougar).
• The "Source" tab is no longer empty when code being tested throws an uncaught exception (fixing bug #5)
• Previously, certain uses of the new operator were instrumented incorrectly; this has now been fixed (thanks to Guillaume Lung).
• The jscoverage-server program now allows more characters in URLs (thanks to Guillaume Lung).
• The jscoverage-server program now handles HTTP headers with empty values (thanks to Velo).
• The jscoverage program now refuses to instrument code which has already been instrumented (thanks to Velo).
• URLs containing spaces now work correctly (thanks to Igor Papkov).
• Previously, on Windows, the jscoverage program was unable to instrument a directory in a drive root; this has now been fixed.
• Encoded URLs are now handled better in the query string.
• A limitation of 65,535 lines per file and 65,535 characters per line has been removed.
• Floating-point numbers are now handled with improved precision.
• The jscoverage-server program can no longer bind to the same port multiple times on Windows.
• Some bugs in jscoverage-server's handling of the "chunked" Transfer-Encoding have been fixed.
• Compilation under Cygwin now uses the -mno-cygwin flag.
• The wire format used for submitting coverage reports for storage by jscoverage-server has changed. (This change will not have any visible effects for most users; it will only be of interest to those who have written code which parses that format.)

December 11, 2008 - JSCoverage 0.4

JSCoverage 0.4 is available for download.

This release includes many new features:

• The new jscoverage-server program is provided as an alternative to the jscoverage program. The jscoverage-server program is a simple HTTP server which instruments JavaScript code as it is served; this allows you to execute JavaScript and gather code coverage statistics without a preliminary step of creating instrumented code. The jscoverage-server program can either serve files directly from the filesystem or run as a proxy server (with the --proxy option), instrumenting JavaScript provided by another web server.
• Using jscoverage-server, coverage reports can now be stored to the filesystem.
• JSCoverage now recognizes special JavaScript comments which specify that certain lines of code should be ignored in coverage reports.
• The new --encoding option provides better support for different character encodings.
• The JSCoverage user interface is now faster and more responsive.
• The new --no-highlight option can be used to disable syntax highlighting (giving better performance for large JavaScript files).
• The build system has been modified so that make install only installs the jscoverage and jscoverage-server executables and their manual pages. (Previous versions installed SpiderMonkey library and executable files, which could conflict with other versions of SpiderMonkey installed on your system.)
• JSCoverage now supports several features beyond those found in the ECMAScript Language Specification, including the following:
  • getters and setters
  • for each loops
  • generators and iterators
  • the let keyword
  • destructuring assignment
  • array comprehensions
  • expression closures
  • generator expressions
  Use the new --js-version option to enable these features.

The GCC C++ compiler (g++) is now required to compile JSCoverage. (Previously, only the C compiler was needed.)

Please report any bugs you find using the new bug tracker.

March 31, 2008 - JSCoverage and Firefox 3

The JSCoverage FAQ has been updated to address problems using JSCoverage with Firefox 3.

March 24, 2008 - JSCoverage in Debian GNU/Linux

JSCoverage is now available in the Debian unstable distribution.

November 22, 2007 - JSCoverage 0.3.1

JSCoverage 0.3.1 is available for download.

This release has a number of bug fixes:

• It should now be possible to run the native Windows version of jscoverage with minimal privileges.
• All files used by JSCoverage now use a jscoverage prefix to avoid name collisions.
• Compilation bugs which occurred under some versions of MSYS have been fixed.
• Various documentation improvements.

August 26, 2007 - JSCoverage 0.3

JSCoverage 0.3 is available for download.

This release has the following new features:

• The coverage summary now displays bar graphs (thanks to Ross Simpson).
• A progress bar is displayed for lengthy computations.
• JavaScript syntax highlighting has improved.
• The display of missed statements can be turned on and off.
• New "inverted mode" provides better support for working with JsUnit.

August 23, 2007 - JSCoverage in Linux Format magazine

JSCoverage is in the October 2007 issue of Linux Format magazine (table of contents).

July 31, 2007 - Subversion repository now available

See the download page for instructions on accessing the Subversion repository.

July 8, 2007 - JSCoverage 0.2

JSCoverage 0.2 is available for download.

JSCoverage 0.2 features a new tabbed user interface.

July 1, 2007 - JSCoverage 0.1.1

JSCoverage 0.1.1 is available for download.

JSCoverage 0.1.1 fixes a bug that can cause large JavaScript files to be truncated when viewed with Opera.

June 15, 2007 - documentation of JSCoverage internals

A new document, Parsing JavaScript with SpiderMonkey, describes the technique used by JSCoverage to parse JavaScript programs.

May 30, 2007 - new examples

Added some examples of running JSCoverage on popular JavaScript libraries.

May 26, 2007 - JSCoverage 0.1

JSCoverage 0.1 is available for download.