def test__op_imul__then_multiply_each_coordinate():
# given
vector = Vector2D(5.4, 9.0)
# when
vector *= 3
# then
assert_that(vector).is_equal_to(Vector2D(16.2, 27.0))
def test__op_itruediv__then_divide_each_coordinate():
# given
vector = Vector2D(5.4, 9.0)
# when
vector /= 3
# then
assert_that(vector).is_equal_to(Vector2D(1.8, 3.0))
def test__op_isub__then_subtract_each_coordinate():
# given
vector = Vector2D(5.4, 9.0)
# when
vector -= Vector2D(7.9, -8.1)
# then
assert_that(vector).is_equal_to(Vector2D(-2.5, 17.1))
def test__op_iadd__then_add_each_coordinate():
# given
vector = Vector2D(5.4, 9.0)
# when
vector += Vector2D(7.9, -8.1)
# then
assert_that(vector).is_equal_to(Vector2D(13.3, 0.9))
def test__op_pos__then_copied():
# given
vector = Vector2D(5.4, 9.0)
# when
result = +vector
# then
assert_that(result).is_not_same_as(vector)
assert_that(result).is_equal_to(Vector2D(5.4, 9.0))
def test__translate__when_zero_vector__then_same_point():
# given
point = Point2D(13.5, 6.5)
# when
result = translate(point, Vector2D(0.0, 0.0))
# then
assert_that(result).is_equal_to(point)
def test__op_add__then_add_each_coordinate():
# when
result = Vector2D(5.4, 9.0) + Vector2D(7.9, -8.1)
# then
assert_that(result).is_equal_to(Vector2D(13.3, 0.9))
def test__op_neg__then_negate_each_coordinate():
# when
result = -Vector2D(5.4, 9.0)
# then
assert_that(result).is_equal_to(Vector2D(-5.4, -9.0))
def test__length__then_length_of_vector(self):
# when
result = Vector2D(8.0, -6.0).length
# then
assert_that(result).is_close_to(10.0, self.OFFSET)
def test__dot__then_scalar_product(self):
# when
result = Vector2D.dot(Vector2D(1.5, -4.0), Vector2D(9.0, -2.5))
# then
assert_that(result).is_close_to(23.5, self.OFFSET)
def test__between__then_vector_from_begin_to_end():
# when
result = Vector2D.between(Point2D(2.4, 7.8), Point2D(-1.5, 13.2))
# then
assert_that(result).is_equal_to(Vector2D(-3.9, 5.4))
def test__coordinates__then_pair_of_coordinates():
# when
result = Vector2D(5.0, -19.0).coordinates
# then
assert_that(result).is_equal_to((5.0, -19.0))
def function(n):
return Vector2D(1.0, 1.0) / n
def test__op_truediv__then_divide_each_coordinate():
# when
result = Vector2D(5.4, 9.0) / 3
# then
assert_that(result).is_equal_to(Vector2D(1.8, 3.0))
def test__dot__when_orthogonal__then_zero(self):
# when
result = Vector2D.dot(Vector2D(1.0, 0.0), Vector2D(0.0, -2.0))
# then
assert_that(result).is_close_to(0.0, self.OFFSET)
def test__op_sub__then_subtract_each_coordinate():
# when
result = Vector2D(5.4, 9.0) - Vector2D(7.9, -8.1)
# then
assert_that(result).is_equal_to(Vector2D(-2.5, 17.1))
def test__area__then_length_of_cross_product(self):
# when
result = Vector2D.area(Vector2D(1.5, -4.0), Vector2D(9.0, -2.5))
# then
assert_that(result).is_close_to(32.25, self.OFFSET)
def test__op_mul__when_multiplication_by_zero__then_zero_vector():
# when
result = Vector2D(5.4, 9.0) * 0
# then
assert_that(result).is_equal_to(Vector2D(0, 0))
def test__area__when_parallel__then_zero(self):
# when
result = Vector2D.area(Vector2D(3.0, 3.0), Vector2D(-8.0, -8.0))
# then
assert_that(result).is_close_to(0.0, self.OFFSET)
def test__op_rmul__then_multiply_each_coordinate():
# when
result = 3 * Vector2D(5.4, 9.0)
# then
assert_that(result).is_equal_to(Vector2D(16.2, 27.0))
def test__translate__then_point_translated():
# when
result = translate(Point2D(13.7, 6.5), Vector2D(-10.4, 3.3))
# then
assert_that(result).is_equal_to(Point2D(3.3, 9.8))