# GM Java <-> Erlang Tests

The core Java libraries are all written as transform functions over data.
There is little point, therefore, in obsessing over "unit tests" and "regression testing" of Java code in Java when we have cannonical code in Erlang.

The purpose of this utility is to instead test the Java libraries agains the Erlang libraries directly.


## How to run

In the current directory simply run `zx runlocal` and the report map will be printed to the screen and random test data will be in the `temp/` directory.

To run a specific test suite run `zx runlocal [module names]`.

To list module names, run `zx runlocal list`.


## Where things are

The test cases are all generated in gmt.erl, generally based on randomized but valid data that are fed to reference Erlang implementations.
The input to and output from each test is recorded to disk in the `temp/` dir.
The inputs are then read in by equivalent Java functions and the output is then compared.

For a test case to pass the outputs must be identical.