laravel assetDatabaseHas() testing method doesn't work

I'm keep getting the following error when using laravel's assertDatabaseHas() method in my tests.

Error: Call to undefined method Illuminate\Http\Response::assertDatabaseHas()

this is my code fragment using assertDatabaseHas() :

$response = $this->withSession(['user_id' => $this->user_id])
        ->json('post',
                route('some_route'),
                $request //an array 
            );

        $request['myuser_id'] = $this->user_id;

        $response->assertStatus($expected['code'])
            ->assertDatabaseHas('profiles',$request);
    }

I also tried to use $this->assertDatabaseHas(), but a new error appeared:

TypeError: Argument 2 passed to PHPUnit\Framework\Assert::assertThat() must be an instance of PHPUnit\Framework\Constraint\Constraint, instance of Illuminate\Foundation\Testing\Constraints\HasInDatabase given, called in /project_path/vendor/laravel/framework/src/Illuminate/Foundation/Testing/Concerns/InteractsWithDatabase.php on line 22

I searched for a while for the problem's solution and found this one : solution , but downgrading phpunit version to 5.* didn't work for me.

I'm using laravel 5.5 and phpunit 6.5.5 .

any idea guys?

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