NAME

Test::TempFile - compact way to use tempfiles in unit tests

SYNOPSIS

# Under Test::More

my $t = Test::TempFile->new([content]);

download_file($url, $t->path);
$t->exists_ok
   ->content_is("Expected content", 'test message')
   ->json_is({ foo => 'bar' }, 'expect file to be JSON' );

my $t = Test::TempFile->to_json({ a => 1 });
run_some_script( config_file => $t->path );

DESCRIPTION

This is a simple module for creating temporarily files with optional initial content, then running various tests on the state of the tempfile.

It is intended for testing code that uses files as input or output.

UTF-8 is assumed everywhere. In the future a binary/raw subclass of this module may be released.

CONSTRUCTORS

new ( [content] )

Create a new tempfile. Upon creation the file will exist but be empty. When this object is destroyed, the file will be deleted if it still exists.

content may be a string or an arrayref of strings (which will be joined using the empty string). The tempfile will be populated with this content.

to_json ( data )

Create a new tempfile, with content set to the JSON representation of data.

to_yaml ( data )

Create a new tempfile, with content set to the YAML representation of data.

INSTANCE METHODS

path

Returns the string path to this tempfile.

absolute

As path but guaranteed to be absolute.

content

Returns the content of this tempfile as a string.

set_content ( content )

Sets the content of this tempfile. content may be a string, or an arrayref of strings (which are passed to join('', ...).

Returns the Test::TempFile object to allow chaining.

append_content ( content )

Appends content to the end of the tempfile. content must be a string.

Returns the Test::TempFile object to allow chaining.

exists

Returns whether or not the tempfile currently exists.

empty

Returns true if the file is non-existent or existent but empty.

filehandle ( [mode] )

Returns a filehandle to the tempfile. The default mode is '>' (read-only) but others may be used ('<', '>>' etc.)

unlink

Unlinks (deletes) the tempfile if it exists.

from_json

Interprets the tempfile contents as JSON and returned the decoded Perl data.

from_yaml

Interprets the tempfile contents as JSON and returned the decoded Perl data.

TEST METHODS

These methods can be used inside unit tests. They always return the Test::TempFile object itself, so multiple tests can be chained.

exists_ok ( [message] )

Asserts that the tempfile exists.

not_exists_ok ( [message] )

Asserts that the tempfile does not exist.

empty_ok ( [message] )

Asserts that the tempfile is empty.

not_empty_ok ( [message] )

Asserts that the tempfile is not empty.

content_is ( expected [, message] )

Asserts that the tempfile contents are equal to expected.

content_like ( expected [, message] )

Asserts that the tempfile contents match the regex expected.

json_is ( expected [, message] )

Asserts that the tempfile contains JSON content equivalent to the Perl data in expected.

yaml_is ( expected [, message] )

Asserts that the tempfile contains YAML content equivalent to the Perl data in expected.

assert ( coderef, message )

Calls coderef with $_ set to this object. Asserts that the coderef returns true. Returns the original object.

Is useful when chaining multiple tests together:

$t->not_empty_ok
  ->assert(sub { $_->content =~ /foo/ })
  ->assert(sub { $_->content !~ /bar/ });