OutputListener.php

<?php
use PHPUnit\Framework\TestListener;

class OutputListener implements TestListener
{
    public function addError(PHPUnit_Framework_Test $test, Exception $e, $time)
    {
        echo PHP_EOL;
        echo PHP_EOL . 'ERROR: ' . get_class($test) . ' ' . $test->getName();
        echo PHP_EOL;
        echo PHP_EOL . $e->getMessage();
        echo PHP_EOL;
        echo PHP_EOL . $this->exceptionTraceToString($e);
        echo PHP_EOL;
    }

    public function addFailure(PHPUnit_Framework_Test $test, PHPUnit_Framework_AssertionFailedError $e, $time)
    {
        echo PHP_EOL;
        echo PHP_EOL . 'FAILURE: ' . get_class($test) . ' ' . $test->getName();
        echo PHP_EOL;
        echo PHP_EOL . $e->getMessage();
        echo PHP_EOL;
    }

    public function addIncompleteTest(PHPUnit_Framework_Test $test, Exception $e, $time)
    {
    }

    public function addRiskyTest(PHPUnit_Framework_Test $test, Exception $e, $time)
    {
    }

    public function addSkippedTest(PHPUnit_Framework_Test $test, Exception $e, $time)
    {
    }

    public function startTest(PHPUnit_Framework_Test $test)
    {
        echo PHP_EOL . get_class($test) . ' ' . $test->getName();
    }

    public function endTest(PHPUnit_Framework_Test $test, $time)
    {
    }

    public function startTestSuite(PHPUnit_Framework_TestSuite $suite)
    {
    }

    public function endTestSuite(PHPUnit_Framework_TestSuite $suite)
    {
    }

    private function exceptionTraceToString($exception)
    {
        $trace = [];
        foreach ($exception->getSerializableTrace() as $line) {
            $text = '';
            if (isset($line['line'])) {
                $text .= '#' . $line['line'];
            }
            $text .= ' ';
            if (isset($line['class'])) {
                $text .= $line['class'];
            }
            if (isset($line['type'])) {
                $text .= $line['type'];
            }
            if (isset($line['function'])) {
                $text .= $line['function'];
            }
            $text .= ' ';
            if (isset($line['file'])) {
                $text .= $line['file'];
            }
            $trace[] = trim($text);
        }
        $trace = implode(PHP_EOL, $trace);
        return $trace;
    }
}

phpunit.xml

<?xml version="1.0" encoding="UTF-8"?>
<phpunit>
	...
	<listeners>
		<listener class="OutputListener" />
	</listeners>
	...
</phpunit>