great acid test will be to use the API to implement the

    [IRS required charity public support test](http://www.irs.gov/Charities-&-Non-Profits/Exempt-Organizations-Annual-Reporting-Requirements-Form-990,-Schedules-A-and-B:-Public-Charity-Support-Test).

2. Convert  [Ledger-CLI](http://www.ledger-cli.org/) to use fixed-point

   arithmetic.

   Currently Ledger-CLI uses floating point arithmetic, which is definitely a

   mistake for an accounting system.  This causes

   [off-by-one bugs](http://bugs.ledger-cli.org/show_bug.cgi?id=992) on some

   types of transactions.  This should be fixed.

   A successful student on this task will:

3. Build a better test suite for [Ledger-CLI](http://www.ledger-cli.org/).

   Since this project relies so heavily on Ledger-CLI, we'd really like there

   to be a full test coverage for Ledger-CLI.  To do that, a student will

   need to be already somewhat familiar C++ and willing to learn about how to

   set up test suites for C++ programs, and likes writing tests.  The student

   could easily spend the whole summer just writing tests and not finish.

    Ledger-CLI does have a basic test suite, but it might turn out that using

    a more "full featured" test harness is useful.  The student will

    investigate and discuss this possibility with the mentor.  It would also