dturn jest tests

[ddfridley]

Create jest tests for the dturn algorithm. These should be in app/dturn/tests

It's okay to create multiple files, or add tests to an existing test file, depending on what makes sense.
It's okay for multiple people to assign themselves to this task to work on different tests, in different files, but please coordinate on which tests you are working on so there is no redundancy.

It's great to generate other tests, this list can keep growing.

If there are questions about these, or something doesn't make sense please ask. That's why we are doing t
Where it says statements here, it's statements that are being added to the discussion, some tests will have to make and keep statement objects in order to do fulfill some of the tests

• requires getDiscussionStatus #155 to use to test the state of a discussion after operations are preformed
• Can initialize an empty discussion
• Can add 1 statement to a discussion
• Can not get statements from a discussion that doesn't have enough statements
• Can add 10 statements to a discussion, with group size of 10
• Can add 10 statements to a discussion and then get 9 (group_size-1) statements from the discussion
• Can put groupings of 2 statements in one group, and 3 statements in the other
• Can rank 2 statements as most important
• more tests go here