THE TEST FILE

Test files typically are placed inside the "t/" directory, and end with the ".t" file extension.

"t/example.t":

use Test2::V0;
# Assertions will go here
done_testing;

This is all the boilerplate you need.

use Test2::V0;

This loads a collection of testing tools that will be described later in the tutorial. This will also turn on "strict" and "warnings" for you.

done_testing;

This should always be at the end of your test files. This tells Test2 that you are done making assertions. This is important as "test2" will assume the test did not complete successfully without this, or some other form of test "plan".

DIST CONFIG

You should always list bundles and tools directly. You should not simply list Test2::Suite and call it done, bundles and tools may be moved out of Test2::Suite to their own dists at any time.

Dist::Zilla

[Prereqs / TestRequires]
Test2::V0 = 0.000060

ExtUtils::MakeMaker

my %WriteMakefileArgs = (
  ...,
  "TEST_REQUIRES" => {
    "Test2::V0" => "0.000060"
  },
  ...
);

Module::Install

test_requires 'Test2::V0' => '0.000060';

Module::Build

my $build = Module::Build->new(
    ...,
    test_requires => {
        "Test2::V0" => "0.000060",
    },
    ...
);

RUN DIRECTLY

$ perl -Ilib t/example.t

Which should produce output like this:

# Seeded srand with seed '20161028' from local date.
ok 1 - 1 is true, so this will pass
1..1

If the test had failed ("ok(0, ...)") it would look like this:

# Seeded srand with seed '20161028' from local date.
not ok 1 - 0 is false, so this will fail
1..1

Test2 will also set the exit value of the script, a successful run will have an exit value of 0, a failed run will have a non-zero exit value.

USING YATH

The "yath" command line tool is provided by Test2::Harness which you may need to install yourself from cpan. "yath" is the harness written specifically for Test2.

$ yath -Ilib t/example.t

This will produce output similar to this:

( PASSED )  job  1    t/example.t
================================================================================
Run ID: 1508027909
All tests were successful!

You can also request verbose output with the "-v" flag:

$ yath -Ilib -v t/example.t

Which produces:

( LAUNCH )  job  1    example.t
(  NOTE  )  job  1    Seeded srand with seed '20171014' from local date.
[  PASS  ]  job  1  + 1 is true, so this will pass
[  PLAN  ]  job  1    Expected asserions: 1
( PASSED )  job  1    example.t
================================================================================
Run ID: 1508028002
All tests were successful!

USING PROVE

The "prove" command line tool is provided by the Test::Harness module which comes with most versions of perl. Test::Harness is dual-life, which means you can also install the latest version from cpan.

$ prove -Ilib t/example.t

This will produce output like this:

example.t .. ok
All tests successful.
Files=1, Tests=1,  0 wallclock secs ( 0.01 usr  0.00 sys +  0.05 cusr  0.00 csys =  0.06 CPU)
Result: PASS

You can also request verbose output with the "-v" flag:

$ prove -Ilib -v t/example.t

The verbose output looks like this:

example.t ..
# Seeded srand with seed '20161028' from local date.
ok 1 - 1 is true, so this will pass
1..1
ok
All tests successful.
Files=1, Tests=1,  0 wallclock secs ( 0.02 usr  0.00 sys +  0.06 cusr  0.00 csys =  0.08 CPU)
Result: PASS