Unexpected incorrect usage notice for wpdb::prepare in wordpress test lib

[skarabeq]

When I use phpunit for wordpress with factory like as:

<?php
public function testCategory()
    {
        // Create category
        $category = $this->factory()->term->create([
            'name'     => 'Test',
            'taxonomy' => 'category'
        ]);

        $this->assertTrue(is_int($category) ? true : false);
    }

I got error

Unexpected incorrect usage notice for wpdb::prepare
Failed asserting that an array is empty.

I tested it with wordpress test lib 4.8.1, 4.8.2 , 4.8.3 and 4.9. Only 4.8.1 and 4.8.2 is works as expected. After version 4.8.2 I think you are changes something and all tests who used factory create are broken. I am very disappointed with this!

[bor0]

Cannot reproduce this on ​https://develop.svn.wordpress.org/trunk.

PHPUnit 5.7.25 by Sebastian Bergmann and contributors.

.                                                                   1 / 1 (100%)

Time: 1.59 seconds, Memory: 36.00MB

OK (1 test, 1 assertion)

[swissspidy]

Failed asserting that an array is empty.

That doesn't match the assertion $this->assertTrue(is_int($category) ? true : false); (which btw should just be $this->assertTrue(is_int($category)); or $this->assertInternalType( 'int', $category );).

Are you sure the error is caused by this method?