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wrong filtering in assertArraySubset method of PHPUnit_Framework_Assert class #2108

xilnick opened this Issue Mar 8, 2016 · 2 comments


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xilnick commented Mar 8, 2016

PHPUnit_Framework_Assert::assertArraySubset documented to accept array and subset arguments as array or ArrayAcces, but actually it only cheks array and subset arguments to be an array and don't do this for ArrayAccess.


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sebastianbergmann commented Apr 13, 2016

Thank you for your report.

Please provide a minimal, self-contained, reproducing test case that shows the problem you are reporting.

Without such a minimal, self-contained, reproducing test case I will not be able to investigate this issue.


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Johannestegner commented Nov 3, 2016

Adding a "minimal, self-contained, reproducing test case that shows the problem".


class ExampleArrayAccessTest extends PHPUnit_Framework_TestCase {

    public function testArrayAccessStuff() {

        $arr = new ExampleArrayAccess();
        $arr[0] = 1;
        $arr[1] = 10;

        $this->assertArraySubset([1, 10], $arr);

class ExampleArrayAccess implements ArrayAccess {

    private $array = array();

    public function offsetExists($offset) {
        return isset($offset, $this->array);

    public function offsetGet($offset) {
        return $this->array[$offset];

    public function offsetSet($offset, $value) {
        $this->array[$offset] = $value;

    public function offsetUnset($offset) {

First error that one will hit is:

Argument 2 (No Value) of PHPUnit_Framework_Assert::assertArraySubset() must be a array or ArrayAccess

Which means that is_array($arr); returns false if its not actually a native array.
So I tried a naïve quick fix in the Assert.php file:

// line ~72
if (!is_array($array) && !($array instanceof ArrayAccess)) {
    throw PHPUnit_Util_InvalidArgumentHelper::factory(
        'array or ArrayAccess'

Which then produces the following error:

array_replace_recursive(): Argument 1 is not an array

So the issue is that array_replace_recursive() does not work with ArrayAccess implementations, only with the native array.

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