Getting started with Perl, Part 1 An introduction to the language that "can do anything" Summary Perl can often offer a simple solution when writing a program that can be painfully difficult in shell script.
Sometimes you have several modules that work together. You could create a separate module directory for each one: Zot One problem with this is that you have to keep hopping between directories to edit and build them.
A bigger problem is that you can't test them together. Suppose you make edits to both modules. Now you try to test Foo:: In particular, it uses the currently released version, which doesn't have the edits that you just made to Foo:: Zot in the development area.
So you can't test Foo:: Bar until you've installed the new version of Foo:: Zot, which you probably don't want to do right now, since you haven't tested it yet. The solution is to create both modules into the same directory: PL to do this; MakeMaker scans the build directory for.
Testing a Perl Module from the Build Directory For example, if you are maintaining several. Harness to run the test files. Harness collects the output and reports the number of tests that pass and fail.
However, to get started, you only need to know a few things The first line of output should be N where N is the total number of tests in the file. The skeleton provided in Foo-Bar. Each test should print on success or not ok n description on failure.
The description is optional; it can be any text. More modules provide additional facilities to aid in writing tests. Bar on the fodder file. Beware that when make test executes a.
So open FILE, "fodder" won't work. Some well chosen description text in the test output will make this more informative.
By default, make test runs all the. If the module is installed, this is easy enough, but what if the module isn't installed? Somehow, you have to get the program to find the. This used to require playing complicated games with INC or use lib, but as of Perl 5.
If you are in the module directory, you can do There are a variety of filters for translating POD files to other formats: Programmers are strongly encouraged to write PODs for all their Perl programs and modules.
See module PODs for details. The build procedure for a Perl module automatically creates and installs a man page for the module.3 Perl Basics Script names While generally speaking you can name your script/program anything you want, there are a number of conventional extensions applied to portions of the Perl bestiary.
Originally created to simplify the task of reading and writing config files in an XML format, XML::Simple translates data between XML documents and native Perl data structures with no intervening abstract interface. Elements and attributes are accessed using nested references.
This module simplifies the task of writing test files for Perl modules, such that their output is in the format that Test::Harness expects to see. QUICK START GUIDE To write a test for your new (and probably not even done) module, create a new file called t/test.t (in a new t directory).
XML::Writer is a helper module for Perl programs that write an XML document.
The module handles all escaping for attribute values and character data and constructs different types of markup, such as tags, comments, and processing instructions. You can write test cases in perl using the perl Test::Simple module which has the basic functionality for testing.
Before proceed to writing test case, first you need to plan the number of test cases and then the actual test cases.
Writing a Switch Statement.
Problem. and those expressions are more complex than a simple string, numeric, or pattern comparison. Perl's switch can handle this too, but you have to be a bit more careful.
For a case item to be an arbitrary expression, wrap that expression in a subroutine.