ThomasWeinert/phpunit-xpath-assertions


Xpath based assertions for PHPUnit

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  • Updated at: 2019-08-19 23:11:07

phpunit-xpath-assertions

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Xpath assertions and constraints for use with PHPUnit.

Example

use PHPUnit\Framework\TestCase;
use PHPUnit\Xpath\Assert as XpathAssertions;

class MyProjectExampleTest extends TestCase
{
    use XpathAssertions;

    public function testChildElementExistsInDocument()
    {
        $document = new \DOMDocument();
        $document->loadXML('<root><child>TEXT</child></root>');

        self::assertXpathMatch('//child', $document);
    }

    public function testCompareChildElementFromDocument()
    {
        $document = new \DOMDocument();
        $document->loadXML('<root><child>TEXT</child></root>');

        self::assertXpathEquals('<child>TEXT</child>', '//child', $document);
    }
}

Installation

Phar

If you're using PHPUnit as a PHAR, you can download this extension as PHAR, too. They the are available on the release page. Download the extension *.phar file into a directory and provide the directory in the PHPUnit configuration file.

<?xml version="1.0" encoding="UTF-8"?>
<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/6.3/phpunit.xsd"
         extensionsDirectory="tools/phpunit.d">
</phpunit>

Composer

If you use Composer to manage the dependencies of your project then you can add the PHPUnit example extension as a development-time dependency to your project:

$ composer require --dev thomasweinert/phpunit-xpath-assertions

Usage

The library provides traits that you can use to add the assertions to your TestCase.

use PHPUnit\Xpath\Assert as XpathAssertions;
use PHPUnit\Xpath\Constraint as XpathConstraints;

class MyProjectExampleTest extends \PHPUnit\Framework\TestCase
{
    use XpathAssertions;
    use XpathConstraints;
}

Constraints

Use trait PHPUnit\Xpath\Constraint. They can be used with assertThat() or with Mocks.

self::matchesXpathExpression()

function matchesXpathExpression(string $expression, array|\ArrayAccess $namespaces = [])

Validate if the provided Xpath expression matches something that is TRUE and not empty. It will fail if the expression returns an empty node list or an empty string or FALSE.

public function testChildElementExistsInDocument()
{
    $document = new \DOMDocument();
    $document->loadXML('<root><child>TEXT</child></root>');

    self::assertThat(
        $document,
        self::matchesXpathExpression('//child')
    );
}

self::matchesXpathResultCount()

function matchesXpathResultCount(
    int $expectedCount, string $expression, array|\ArrayAccess $namespaces = array()
)

Returns true if the provided Xpath expression matches exactly the expected count of nodes.

public function testChildElementExistsOnTimeInDocument()
{
    $document = new \DOMDocument();
    $document->loadXML('<root><child>TEXT</child></root>');

    self::assertThat(
        $document,
        self::matchesXpathResultCount(1, '//child')
    );
}

self::equalToXpathResult()

function equalToXpathResult(
    mixed $expected, 
    string $expression, 
    array|\ArrayAccess, 
    $namespaces = array()
)

If the expressions return a node list it compares the serialized XML of the matched nodes with the provided XML string or DOM. If the expression return a scalar uses a constraint depending on the type.

public function testCompareChildElementFromDocument()
{
    $document = new \DOMDocument();
    $document->loadXML('<root><child>TEXT</child></root>');

    self::assertThat(
        $document,
        self::equalToXpathResult(
            '<child>TEXT</child>',
            '//child'
        )
    );
}
public function testCompareChildElementFromDocumentAsString()
{
    $document = new \DOMDocument();
    $document->loadXML('<root><child>TEXT</child></root>');

    self::assertThat(
        $document,
        self::equalToXpathResult(
            'TEXT',
            'string(//child)'
        )
    );
}

Assertions

Use trait PHPUnit\Xpath\Assert. These assertions are shortcuts for assertThat().

  • self::assertXpathMatch()
  • self::assertXpathCount()
  • self::assertXpathEquals()

Namespaces

All methods have an optional argument that allow to provide an namespace definition.

public function testChildWithNamespaceElementExistsTwoTimesInDocument()
{
    $document = new \DOMDocument();
    $document->loadXML(
        '<example:root xmlns:example="urn:example">
        <example:child>TEXT</example:child>
        <example:child>TEXT</example:child>
        </example:root>'
    );

    self::assertThat(
        $document,
        self::matchesXpathResultCount(2, '//e:child', ['e' => 'urn:example'])
    );
}

JSON (>= 1.2.0)

The assertions can be used with JsonSerializable objects/arrays. They will be converted into a DOM representation internally.

public function testHomePhoneNumbersEqualsExpected()
{
    self::assertXpathEquals(
        [
            [ 'type' => 'home', 'number' => '212 555-1234' ]
        ],
        'phoneNumbers/*[type="home"]',
        json_decode($wikipediaJsonExample)
    );
}

Contributing

Contributions are welcome, please use the issue tracker to report bug and feature ideas.

Build a modified phar

This project uses Phive and Composer. It includes build scripts to create your own phar file. Use Git to checkout the repository and run phive install in the project directory this will install the necessary tools into the tools subdirectory. To create a phar call tools\phing.

Build a signed phar

To create a signed phar copy the dist.build.properties to build.properties and set the gpg.user. After that call tools\phing package.