def test_comparison():
"""Test if @functools.total_ordering really works."""
c1 = Circle(2)
c2 = Circle(4)
assert (c1 > c2) is False
assert (c1 < c2) is True
assert (c1 == c2) is False
c3 = Circle(4)
assert (c2 == c3) is True
def test_non_negative_radius():
"""Test that the radius cannot be made negative."""
with pytest.raises(ValueError):
c = Circle(-1)
with pytest.raises(ValueError):
d = Circle.from_diameter(-4)
with pytest.raises(ValueError):
Circle(4) - Circle(5)
with pytest.raises(ValueError):
c = Circle(1)
c.radius -= 2
def test_diam_prop(capsys):
"""Test the diameter property."""
c = Circle(4)
assert c.diameter == 8
print(c.diameter)
out, _ = capsys.readouterr()
assert out.strip() == "8"
def test_init(capsys):
"""Test instantiation and radius property."""
c = Circle(4)
assert c.radius == 4
print(c.radius)
out, _ = capsys.readouterr()
assert out.strip() == "4"
def test_augmented_assignments():
"""Test if +=, -=, and *= operators work."""
a_circle = Circle(2)
a_circle += Circle(3)
assert a_circle == Circle(5)
a_circle = Circle(2)
a_circle *= 4
assert a_circle == Circle(8)
a_circle = Circle(3)
a_circle -= Circle(2)
assert a_circle == Circle(1)
def test_add():
"""Test the addition of two circles with the + sign."""
c1 = Circle(2)
c2 = Circle(4)
assert c1 + c2 == Circle(6)
def test_eq():
"""Test the __eq__ method."""
c1 = Circle(4)
c2 = Circle(4)
assert c1 == c2
assert Circle(3) != Circle(1)
def test_repr():
"""Test the __repr__ method."""
c = Circle(4)
assert repr(c) == "Circle(4)"
d = eval(repr(c))
assert d == Circle(4) # Circle.__eq__ must be implemented to compare!
def test_str(capsys):
"""Test the __str__ method."""
c = Circle(4)
print(c)
out, _ = capsys.readouterr()
assert out.strip() == "Circle with radius: 4.000000"
def test_alt_constr_diam():
"""Test an alternative constructor to create a Circle from diameter."""
c = Circle.from_diameter(8)
assert c.diameter == 8
assert c.radius == 4
def test_area_attr_error():
"""Test that the user can't set the area."""
c = Circle(2)
with pytest.raises(AttributeError):
c.area = 42
def test_area():
"""Test the area property."""
c = Circle(2)
assert c.area == pytest.approx(12.566370)
def test_diam_setter():
"""Test the diameter property setter."""
c = Circle(4)
c.diameter = 2
assert c.radius == 1
assert c.diameter == 2
def test_mul():
"""Test the scalar multiplication."""
assert Circle(4) * 3 == Circle(12)
def test_sub_circle():
"""Test subtraction of one circle from another."""
a_circle = Circle(4)
c3 = a_circle - Circle(1)
assert c3 == Circle(3)
def test_rmul():
"""Test the __rmul__ for the right scalar multiplication."""
assert 3 * Circle(4) == Circle(12)
def test_reflected_numerics():
"""Test __eq__ fpr additional cases."""
a_circle = Circle(2)
assert (a_circle * 3) == (3 * a_circle)
def test_sort():
"""Test if I can sort a list of circles by radius."""
circles = []
for i in range(0, 11):
circles.append(Circle(i))
random.shuffle(circles)
circles.sort()
assert circles == [
Circle(0),
Circle(1),
Circle(2),
Circle(3),
Circle(4),
Circle(5),
Circle(6),
Circle(7),
Circle(8),
Circle(9),
Circle(10)
]
