Business Requirement

As a student, I'd like to get a multiplication table of a specified range. The input should be 2 integers specifying the start and the end of the table:

AC1: The start number should not be greater than the end number, otherwise the function will return nothing.

AC2: The start number and the end number can be any integer in a range of 1 to 10 (inclusive).

AC3: The output should be a string represents the multiplication table. Suppose that the start number is 2 and the end number is 4, the output should be something like the following.

2*2=4
2*3=6  3*3=9
2*4=8  3*4=12  4*4=16

Practice Requirement

1. Please draw the whole tasking diagram.
2. Please declare all the functions according to your diagram.
3. Please write a test case following given...when...then pattern for a leaf block of the diagram. Then implement the block to pass the test. Should only test the render method.
4. Please repeat step 3 until all functions are implemented.