PhpInvariant

PhpInvariant is a property-based testing framework for php
It runs your code on customized random data and checks predefined invariants (similar to QuickCheck)

Installation

The recommended way to install PhpInvariant is through Composer

composer require --dev sergey-bel/phpinvariant

Quick start

1. Create a folder invariants
2. Create ...Invariant class inside this folder
   1. Class must extends BaseInvariant
   2. Each public method with a name 'check...' will be launched
3. Run command vendor/bin/phpinvariant run --path=invariants

See examples

Example

class IntegerInvariant extends BaseInvariant
{
    // run check method 10 times
    #[FinishRuns(10)]
    public function checkInteger()
    {
        // $x is a random integer in [50, 100]
        $x = $this->provider->integer(50, 100)->get();

        $this->assertTrue(is_integer($x));
        // fail when $x=100
        $this->assertLessOrEqual($x, 99);
        $this->assertGreaterOrEqual($x, 50);
    }
}

Provider

Provider is a main class to generate random data

This example will generate a alphabetic string with length between 5 and 10 (inclusive)

$this->provider
       ->string(5, 10)
       ->alphabetic()
       ->get();

Finish conditions

Finish conditions are used to determine when to end the check execution
Finish condition is specified by method attribute

Command Line Options

--path
Specifies directory with Check classes
--config
Specifies the path to a configuration file
--no-progress
Do not show progress bar
--quiet
Do not output any message
--seed
Specifies random seed

Configuration file

PhpInvariant uses YAML configuration format. All command line options are supported in configuration file parameters section

Example:

parameters:
   path: invariants
   no-progress: false

A config file can be passed in --config option:

vendor/bin/phpinvariant run --config=phpinvariant.yml

Development

git clone https://github.com/SergeyBel/phpinvariant.git
docker-compose up -d

Use Makefile commands:
fix - run code style fixer
static - run static analyzer
test - run tests