def test_volts_p_over_i(self):
		p = 10
		i = 2
		correct_result = 5
		assert(ohm.calc_voltage(p=p, i=i) == correct_result)
	def test_volts(self):
		p = 12
		r = 3
		correct_result = 6
		assert(ohm.calc_voltage(p=p, r =r) == correct_result)
	def test_volts_i_times_r(self):
		i = 10
		r = 20
		correct_result = 200
		assert(ohm.calc_voltage(i=i, r=r) == correct_result)