php-ml/tests/Phpml/NeuralNetwork/Node/Neuron/SynapseTest.php

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<?php
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declare(strict_types=1);
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namespace tests\Phpml\NeuralNetwork\Node\Neuron;
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use Phpml\NeuralNetwork\Node\Neuron;
use Phpml\NeuralNetwork\Node\Neuron\Synapse;
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use PHPUnit\Framework\TestCase;
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class SynapseTest extends TestCase
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{
public function testSynapseInitialization()
{
$node = $this->getNodeMock($nodeOutput = 0.5);
$synapse = new Synapse($node, $weight = 0.75);
$this->assertEquals($node, $synapse->getNode());
$this->assertEquals($weight, $synapse->getWeight());
$this->assertEquals($weight * $nodeOutput, $synapse->getOutput());
$synapse = new Synapse($node);
$this->assertInternalType('float', $synapse->getWeight());
}
public function testSynapseWeightChange()
{
$node = $this->getNodeMock();
$synapse = new Synapse($node, $weight = 0.75);
$synapse->changeWeight(1.0);
$this->assertEquals(1.75, $synapse->getWeight());
$synapse->changeWeight(-2.0);
$this->assertEquals(-0.25, $synapse->getWeight());
}
/**
* @param int $output
*
* @return \PHPUnit_Framework_MockObject_MockObject
*/
private function getNodeMock($output = 1)
{
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$node = $this->getMockBuilder(Neuron::class)->getMock();
$node->method('getOutput')->willReturn($output);
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return $node;
}
}