Spy is a flexible and open framework for designing and implementing program monitor. Spy enables test coverage, code profiling and type inference.

Code example:

Note that code profiling require sensitive code instrumentation mechanism. Although we are putting a great deal of effort on the stability and reliability of this tool, it could however lead to a freeze and/or crash or your image.

Execution profiling:

ProfilingPackageSpy 
  viewProfiling: [
    | view |
    view := MOViewRenderer new.
    view nodes: (1 to: 100) forEach: [:each | view nodes: (1 to: 100)].
    view root applyLayout 
    ] 
  inPackage: 'Mondrian'

More example related to execution profiling may be found in the class ProfilingPackageSpy

Extracting the type information of Moose from the unit test execution:

 TypingPackageSpy runTestAndViewTypesForPackageNamed: ’Mondrian’   

Test coverage may be also obtained. The following expression computes and render the test coverage of Moose:

 CoveragePackageSpy viewCoverageForPackagesMatching: ’Mondrian*’ 

Download

The source code may be browsed online and downloaded from http://www.squeaksource.com/Spy.html To install Spy, just do it:

Gofer new
  squeaksource: 'MetacelloRepository'; 
  package: 'ConfigurationOfSpy';
  load.
(Smalltalk at: #ConfigurationOfSpy) perform: #loadDefault 

License: BSD