Failed asserting that a row in the table [employees] matches the attributes

Hello Everyone, I am following Build A Laravel App With TDD series from laracasts . Though it's a old series . I am getting an error while testing. Sometimes I get an error on a test and sometimes test passes. I am unable to fix the error. When I get an error it says Failed asserting that a row in the table [employees] matches the attributes

This is my code for test

class EmployeeTest extends TestCase
{
    use withFaker, RefreshDatabase;

    public function test_create_employee()
    {
        $this->withoutExceptionHandling();
        $attributes = [
            'name' => $this->faker->name,
            'office_id' => $this->faker->numerify('3###'),
            'designation' => $this->faker->jobTitle(),
            'email' => $this->faker->unique()->safeEmail(),
            'mobile' => $this->faker->numerify('017########'),
            'status' => $this->faker->numberBetween(1, 3),
        ];

        $this->post('employee', $attributes);
        $this->assertDatabaseHas('employees', $attributes);

    }

}

This is the error

https://ibb.co/qr97nQ5

If i run the test several time the test pass too.