[Nette Tester](https://tester.nette.org): enjoyable unit testing
================================================================

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Introduction
------------

Nette Tester is a productive and enjoyable unit testing framework. It's used by
the [Nette Framework](https://nette.org) and is capable of testing any PHP code.

Documentation is available on the [Nette Tester website](https://tester.nette.org).
Read the [blog](https://blog.nette.org/category/tester/) for new information.

If you like Nette, **[please make a donation now](https://nette.org/donate)**. Thank you!


Installation
------------

The recommended way to install Nette Tester is through Composer:

```
composer require nette/tester --dev
```

Alternatively, you can download the [tester.phar](https://github.com/nette/tester/releases) file.

Nette Tester 2.0 requires PHP 5.6 and supports PHP up to 7.3. The 2.1 version and newer require PHP 7.1.
Collecting and processing code coverage information depends on Xdebug or PCOV extension, or PHPDBG SAPI.


Writing Tests
-------------

Imagine that we are testing this simple class:

```php
class Greeting
{
	function say($name)
	{
		if (!$name) {
			throw new InvalidArgumentException('Invalid name.');
		}
		return "Hello $name";
	}
}
```

So we create test file named `greeting.test.phpt`:

```php
require 'src/bootstrap.php';

use Tester\Assert;

$h = new Greeting;

// use an assertion function to test say()
Assert::same('Hello John', $h->say('John'));
```

Thats' all!

Now we run tests from command-line using the `tester` command:

```
> tester
 _____ ___  ___ _____ ___  ___
|_   _/ __)( __/_   _/ __)| _ )
  |_| \___ /___) |_| \___ |_|_\  v2.2.0

PHP 7.3.3 | php -n | 8 threads
.
OK (1 tests, 0 skipped, 0.0 seconds)
```

Nette Tester prints dot for successful test, F for failed test
and S when the test has been skipped.


Assertions
----------

This table shows all assertions (class `Assert` means `Tester\Assert`):

- `Assert::same($expected, $actual)` - Reports an error if $expected and $actual are not the same.
- `Assert::notSame($expected, $actual)` - Reports an error if $expected and $actual are the same.
- `Assert::equal($expected, $actual)` - Like same(), but identity of objects and the order of keys in the arrays are ignored.
- `Assert::notEqual($expected, $actual)` - Like notSame(), but identity of objects and arrays order are ignored.
- `Assert::contains($needle, array $haystack)` - Reports an error if $needle is not an element of $haystack.
- `Assert::contains($needle, string $haystack)` - Reports an error if $needle is not a substring of $haystack.
- `Assert::notContains($needle, array $haystack)` - Reports an error if $needle is an element of $haystack.
- `Assert::notContains($needle, string $haystack)` - Reports an error if $needle is a substring of $haystack.
- `Assert::true($value)` - Reports an error if $value is not true.
- `Assert::false($value)` - Reports an error if $value is not false.
- `Assert::truthy($value)` - Reports an error if $value is not truthy.
- `Assert::falsey($value)` - Reports an error if $value is not falsey.
- `Assert::null($value)` - Reports an error if $value is not null.
- `Assert::nan($value)` - Reports an error if $value is not NAN.
- `Assert::type($type, $value)` -  Reports an error if the variable $value is not of PHP or class type $type.
- `Assert::exception($closure, $class, $message = null, $code = null)` -  Checks if the function throws exception.
- `Assert::error($closure, $level, $message = null)` -  Checks if the function $closure throws PHP warning/notice/error.
- `Assert::noError($closure)` -  Checks that the function $closure does not throw PHP warning/notice/error or exception.
- `Assert::match($pattern, $value)` - Compares result using regular expression or mask.
- `Assert::matchFile($file, $value)` - Compares result using regular expression or mask sorted in file.
- `Assert::count($count, $value)` - Reports an error if number of items in $value is not $count.

Testing exceptions:

```php
Assert::exception(function () {
	$h = new Greeting;
	$h->say(null);
}, InvalidArgumentException::class, 'Invalid name.');
```

Testing PHP errors, warnings or notices:


```php
Assert::error(function () {
	$h = new Greeting;
	echo $h->abc;
}, E_NOTICE, 'Undefined property: Greeting::$abc');
```

Tips and features
-----------------

Running unit tests manually is annoying, so let Nette Tester to watch your folder
with code and automatically re-run tests whenever code is changed:

```
tester -w /my/source/codes
```

Running tests in parallel is very much faster and Nette Tester uses 8 threads as default.
If you wish to run the tests in series use:

```
tester -j 1
```

How do you find code that is not yet tested? Use Code-Coverage Analysis. This feature
requires you have installed [Xdebug](https://xdebug.org/) or [PCOV](https://github.com/krakjoe/pcov)
extension, or you are using PHPDBG SAPI. This will generate nice HTML report in `coverage.html`.

```
tester . -c php.ini --coverage coverage.html --coverage-src /my/source/codes
```

We can load Nette Tester using Composer's autoloader. In this case
it is important to setup Nette Tester environment:

```php
require 'vendor/autoload.php';

Tester\Environment::setup();
```

We can also test HTML pages. Let the [template engine](https://latte.nette.org) generate
HTML code or download existing page to `$html` variable. We will check whether
the page contains form fields for username and password. The syntax is the
same as the CSS selectors:

```php
$dom = Tester\DomQuery::fromHtml($html);

Assert::true($dom->has('input[name="username"]'));
Assert::true($dom->has('input[name="password"]'));
```

For more inspiration see how [Nette Tester tests itself](https://github.com/nette/tester/tree/master/tests).


Running tests
-------------

The command-line test runner can be invoked through the `tester` command (or `php tester.php`). Take a look
at the command-line options:

```
> tester

Usage:
    tester.php [options] [<test file> | <directory>]...

Options:
    -p <path>                    Specify PHP interpreter to run (default: php).
    -c <path>                    Look for php.ini file (or look in directory) <path>.
    -C                           Use system-wide php.ini.
    -l | --log <path>            Write log to file <path>.
    -d <key=value>...            Define INI entry 'key' with value 'val'.
    -s                           Show information about skipped tests.
    --stop-on-fail               Stop execution upon the first failure.
    -j <num>                     Run <num> jobs in parallel (default: 8).
    -o <console|tap|junit|none>  Specify output format.
    -w | --watch <path>          Watch directory.
    -i | --info                  Show tests environment info and exit.
    --setup <path>               Script for runner setup.
    --temp <path>                Path to temporary directory. Default by sys_get_temp_dir().
    --colors [1|0]               Enable or disable colors.
    --coverage <path>            Generate code coverage report to file.
    --coverage-src <path>        Path to source code.
    -h | --help                  This help.
```