HelperMethodTest.php

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<?php
namespace Magento\Framework\View\Test\Unit\Layout\Argument\Interpreter;

use \Magento\Framework\View\Layout\Argument\Interpreter\HelperMethod;

class HelperMethodTest extends \PHPUnit\Framework\TestCase
{
    protected $_objectManager;

    protected $_interpreter;

    protected $_model;

    protected function setUp()
    {
        $this->_objectManager = $this->createMock(\Magento\Framework\ObjectManagerInterface::class);
        $this->_interpreter = $this->createMock(\Magento\Framework\View\Layout\Argument\Interpreter\NamedParams::class);
        $this->_model = new HelperMethod($this->_objectManager, $this->_interpreter);
    }

    public function testEvaluate()
    {
        $input = ['value' => 'some text', 'helper' => __CLASS__ . '::help'];

        $evaluatedValue = ['value' => 'some text (evaluated)'];
        $this->_interpreter->expects(
            $this->once()
        )->method(
            'evaluate'
        )->with(
            $input
        )->will(
            $this->returnValue($evaluatedValue)
        );

        $this->_objectManager->expects($this->once())->method('get')->with(__CLASS__)->will($this->returnValue($this));

        $expected = 'some text (evaluated) (updated)';
        $actual = $this->_model->evaluate($input);
        $this->assertSame($expected, $actual);
    }

    public function help($input)
    {
        $this->assertSame('some text (evaluated)', $input);
        return $input . ' (updated)';
    }

    public function testEvaluateException($helperMethod, $expectedExceptionMessage)
    {
        $this->expectException('\InvalidArgumentException');
        $this->expectExceptionMessage($expectedExceptionMessage);
        $input = ['value' => 'some text', 'helper' => $helperMethod];
        $this->_model->evaluate($input);
    }

    public function evaluateExceptionDataProvider()
    {
        $nonExistingHelper = __CLASS__ . '::non_existing';
        return [
            'wrong method format' => [
                'help',
                'Helper method name in format "\Class\Name::methodName" is expected',
            ],
            'non-existing method' => [$nonExistingHelper, "Helper method '{$nonExistingHelper}' does not exist"]
        ];
    }
}