def test_circle(self):
# Define instance of Circle
wheel = Circle(1)
# Test __str__
self.assertEqual(wheel.__str__(), "Circle of radius 1.")
# Test area
self.assertEqual(wheel.area(), math.pi)
# Test circumference
self.assertEqual(wheel.circumference(), 2 * math.pi)
def test_area(self):
circ = Circle(1)
self.assertEqual(math.pi, circ.area())
def test_area_zero_radius(self):
circ = Circle(0)
area = circ.area()
self.assertEqual(0, area)
def zero_circle_area():
zero_circle = Circle(-7, -9, 0)
assert zero_circle.area() == 0
def test_circle_area():
my_circle = Circle(5, 11, 3)
assert my_circle.area() == approx(28.273, abs=0.001)
