I have a PHPUnit test that’s failing but the test output is hiding important part of the failed data. How to make the whole data visible?

To demonstrate the issue, here’s a mock test UnitTest.php:

<?php

class UnitTest extends PHPUnitFrameworkTestCase
{
  public function testAssertingArrays()
  {
    $mock_testresult = array(
      0 => "Some short string",
      1 => "Some really long string that just keeps going and going and going but contains important clue HERE about why this whole test failed.",
    );
    $this->assertEquals($mock_testresult, array(), "Expected empty array but got non-empty array.");
  }
}

When I run it as phpunit UnitTest.php I get following output:

There was 1 failure:

1) UnitTest::testAssertingArrays
Expected empty array but got non-empty array.
Failed asserting that two arrays are equal.
--- Expected
+++ Actual
@@ @@
 Array (
-    0 => 'Some short string'
-    1 => 'Some really long string that ...ailed.'
 )

How to make the full string visible in PHPUnit output so that I can see the word HERE in the console? I couldn’t find any documentation that would have described this kind of shortening or clipping the asserted data and I don’t want any shortening or clipping here.