Collide rectangles in Python (touching considered not a collision) with tests

rectangle_collision.py

#!/usr/bin/env python

class Rectangle:
    def __init__(self, x, y, width, height):
        self.x = x
        self.y = y
        self.width = width
        self.height = height

        # Alternative way of thinking about things
        self.left = x
        self.top = y
        self.right = x + width
        self.bottom = y + height

    def collidesWith(self, other):
        return self.left < other.right and self.right > other.left and self.top < other.bottom and self.bottom > other.top

    def __str__(self):
        return 'Rectangle(' + str(self.x) + ', ' + str(self.y) + ', ' + str(self.width) + ', ' + str(self.height) + ')'

if __name__ == '__main__':
    def pairFromTuples(info):
        return [Rectangle(x[0], x[1], x[2], x[3]) for x in info]

    collidingPairs = [pairFromTuples(x) for x in [
        # Identical
        ((0, 0, 1, 1), (0, 0, 1, 1)),
        # Overlapping
        ((0, 0, 1, 1), (0.5, 0.5, 1, 1)),
        ((0, 0, 1, 1), (-0.5, -0.5, 1, 1)),
        # Nested
        ((0, 0, 1, 1), (0.5, 0.5, 0.25, 0.25)),
    ]]
    nonCollidingPairs = [pairFromTuples(x) for x in [
        # No overlap
        ((0, 0, 1, 1), (2, 2, 1, 1)),
        # Overlap in horizontal
        ((0, 0, 1, 1), (0.5, 2, 1, 1)),
        ((0, 0, 1, 1), (-0.5, 2, 1, 1)),
        ((0, 0, 1, 1), (0.5, -2, 1, 1)),
        ((0, 0, 1, 1), (-0.5, 2, 1, 1)),
        # Overlap in vertical
        ((0, 0, 1, 1), (2, 0.5, 1, 1)),
        ((0, 0, 1, 1), (2, -0.5, 1, 1)),
        ((0, 0, 1, 1), (-2, 0.5, 1, 1)),
        ((0, 0, 1, 1), (-2, -0.5, 1, 1)),
    ]]

    def reportError(message, a, b):
        raise Exception(message + ' a=' + str(a) + ', b=' + str(b))

    for a, b in collidingPairs:
        if not a.collidesWith(b):
            reportError('should collide', a, b)
        if not b.collidesWith(a):
            reportError('should collide', b, a)

    for a, b in nonCollidingPairs:
        if a.collidesWith(b):
            reportError('shouldn’t collide', a, b)
        if b.collidesWith(a):
            reportError('shouldn’t collide', b, a)

    print('All tests pass')