Structure assertion

PHP Tool for asserting array structures using the fluent interface.

Installation

Using Composer, run composer require --dev star/structure-assertion.

Usage

This library is usefull when you have PHPUnit tests, and you want to assert some nodes of an array.

StructureAssertion::fromArray(
    [
        'data' => [
            'id' => 11,
            'array' => [
                1, 
                2,
                3,
            ],
        ],
    ]
)
    ->enterObjectNode('data') // Assert the node 'data' exists and is an object
    ->assertIsSame('id', 11) // Assert the object's property 'id' exists and match the exact value
    ->enterArrayNode('array') // Assert the node 'data' exists and is an array
    ->assertCount(3); // Assert the number of item is exactly 3

Construction methods

• StructureAssertion::fromArray($array);: Using the given array.
• StructureAssertion::fromJsonResponse($response);: Build with a Response object that is assumed to have a JSON content.

Assertions methods

By convention, all assertion methods are named assert*. Under the hood, StructureAssertion uses PHPUnit assertions. Many of the assertions are named after the PHPUnit's constraint.

You can use your own assertion if a specific one is not defined by using the StructureAssertion::assertCallback() method.

ie.

StructureAssertion::fromArray($data)
    ->assertCallback('property', function ($value): bool {
        // When it evaluates to false, the expectation will fail
        // return true | false
    });

Navigation methods

To navigate the nodes, you can use the methods that starts with enter*. We assume that the current node is at the correct position.

• StructureAssertion::exitNode(): Move the internal pointer to the parent node.
• StructureAssertion::nextArrayElement(): Shortcut for exitNode()->enterArrayElement($current + 1). Enters the next element at index + 1. Works only on integer indexed element.

Debugging methods

The lib also provide debugging method, in order to know the current position of the cursor.

• StructureAssertion::dump($maxDepth = 2, $dumpStrategy): Will dump the current node using the $strategy and up to $maxDepth.
• StructureAssertion::dumpPath($dumpStrategy): Will dump the current node path using the $strategy.
• StructureAssertion::dumpKeys($dumpStrategy): Will dump the current node keys using the $strategy.

Contributing

Any contribution is welcome, just propose a Pull request, and we'll look into it.