05-28-2007
extern is not needed for functions, but is needed when refering to external data to avoid duplicate declaration of statics which can be very hard to track down.
Prototypes however are a good idea and required even by K&R if the function does not return an int.
It is good practice and warms you up for when you start mixing C with C++.
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LEARN ABOUT DEBIAN
test::unit::assertion
Test::Unit::Assertion(3pm) User Contributed Perl Documentation Test::Unit::Assertion(3pm)
NAME
Test::Unit::Assertion - The abstract base class for assertions
NAME
Any assertion class that expects to plug into Test::Unit::Assert needs to implement this interface.
Required methods
new Creates a new assertion object. Takes whatever arguments you desire. Isn't strictly necessary for the framework to work with this
class but is generally considered a good idea.
do_assertion
This is the important one. If Test::Unit::Assert::assert is called with an object as its first argument then it does:
$_[0]->do_assertion(@_[1 .. $#_]) ||
$self->fail("Assertion failed");
This means that "do_assertion" should return true if the assertion succeeds and false if it doesn't. Or, you can fail by throwing a
Test::Unit::Failure object, which will get caught further up the stack and used to produce a sensible error report. Generally it's good
practice for do_assertion to die with a meaningful error on assertion failure rather than just returning false.
AUTHOR
Copyright (c) 2001 Piers Cawley <pdcawley@iterative-software.com>.
All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
SEE ALSO
o Test::Unit::Assert
o Test::Unit::CodeRef
o Test::Unit::Regexp
perl v5.8.8 2006-09-13 Test::Unit::Assertion(3pm)