human
Solve the following python programming problem given the following code:
# Nos estudos ficou pytest_bhaskara.py

import Bhaskara
import pytest

class TestBhaskara:

    @pytest.fixture
    def b(self):
        return Bhaskara.Bhaskara()
    
    def testa_uma_raiz(self, b):
        assert b.calcula_raizes(1, 0, 0) == (1, 0)

    def testa_duas_raizes(self, b):
        assert b.calcula_raizes(1, -5, 6) == (2, 3, 2)

    def testa_zero_raizes(self, b):
        assert b.calcula_raizes(10, 10, 10) == 0
        
    def testa_raiz_negativa(self, b):
        assert b.calcula_raizes(10, 20, 10) == (1, -1)
Given the above code, generate some markdown instructions for it.
assistant
#Here is the Python program you requested.

Fixture: valor fixo para um conjunto de testes
@pytest.fixture