perl-Test-LectroTest

This module provides a simple (yet full featured) interface to LectroTest,
an automated, specification-based testing system for Perl. To use it,
declare properties that specify the expected behavior of your software.
LectroTest then checks your software to see whether those properties hold.
Declare properties using the 'Property' function, which takes a block of
code and promotes it to a Test::LectroTest::Property:
Property {

    MyModule::my_function( $x, $y ) >= 0;
}, name => "my_function output is non-negative" ;


The first part of the block must contain a generator-binding declaration.
For example:
(Note the special bracketing, which is required.) This particular binding
says, "For all integers x and y." (By the way, you aren't limited to
integers. LectroTest also gives you booleans, strings, lists, hashes, and
more, and it lets you define your own generator types. See
Test::LectroTest::Generator for more.)
The second part of the block is simply a snippet of code that makes use of
the variables we bound earlier to test whether a property holds for the
piece of software we are testing:
    MyModule::my_function( $x, $y ) >= 0;


In this case, it asserts that 'MyModule::my_function($x,$y)' returns a
non-negative result. (Yes, '$x' and '$y' refer to the same x and y that
we bound to the generators earlier. LectroTest automagically loads these
lexically bound Perl variables with values behind the scenes.)
Note: If you want to use testing assertions like 'ok' from Test::Simple
or 'is', 'like', or 'cmp_ok' from Test::More (and the related family of
Test::Builder-based testing modules), see Test::LectroTest::Compat, which
lets you mix and match LectroTest with these modules.
Finally, we give the whole Property a name, in this case "my_function
output is non-negative." It's a good idea to use a meaningful name because
LectroTest refers to properties by name in its output.
Let's take a look at the finished property specification:
Property {

    MyModule::my_function( $x, $y ) >= 0;
}, name => "my_function output is non-negative" ;


It says, "For all integers x and y, we assert that my_function's output
is non-negative."
To check whether this property holds, simply put it in a Perl program that
uses the Test::LectroTest module. (See the SYNOPSIS for an example.) When
you run the program, LectroTest will load the property (and any others in
the file) and check it by running random trials against the software you're
testing.
Note: If you want to place LectroTest property checks into a test plan
managed by Test::Builder-based modules such as Test::Simple or Test::More,
see Test::LectroTest::Compat.
If LectroTest is able to "break" your software during the property check,
it will emit a counterexample to your property's assertions and stop. You
can plug the counterexample back into your software to debug the problem.
(You might also want to add the counterexample to a list of regression
tests.)
A successful LectroTest looks like this:
1..1
  ok 1 - 'my_function output is non-negative' (1000 attempts)
On the other hand, if you're not so lucky:
1..1
  not ok 1 - 'my_function output is non-negative' falsified 

      in 324 attempts

          

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License: Artistic-1.0 OR GPL-1.0-or-later
URL: http://search.cpan.org/dist/Test-LectroTest/