Software Development

Design a function to calculate the slope of a line connecting two points in the Cartesian plane. Once the function is designed, you will be tasked with creating appropriate test cases to ensure its robustness.

Step $1$: Function Implementation

$1.$ Design a function named calculateSlope that accepts the cartesian coordinates of two points as its parameters.

$2.$ The function should return the slope of the line connecting these two points.

Step $2$: Design Test Cases

$1.$ Create unit test cases for the calculateSlope function. Test cases should address:

a$.$ Typical scenarios of points in different quadrants.

b$.$ Any other edge cases you deem necessary.

Must include:

$1.$ Your function implementation in Python. Ensure code is well documented.

$2.$ All test cases, presented systematically, alongside their expected output. Include a rationale for each test case, explaining why it was chosen.

$3.$ During testing using your test cases, if you encounter any bugs, detail them in the document, specifying how you addressed them.

$4.$ Clearly list and explain any assumptions made regarding the function's behavior or input conditions.