Automated testing

[jeromesimeon]

We should provide tests for various source and target languages. The ./samples directory could provide an initial set of tests. A first push toward testing would involve:

• Separate runners from samples
• Check that the -output option on the command line properly checks for the expected result and returns success and failure properly.
• Add expected outputs for the sample queries in ./samples
• Provide a proper make test target that run the tests in ./samples
• Fix the way testing reports results so it's readable
• Come up with a reasonable first set of tests
• Add tests for backends

[jeromesimeon]

There is a first set of tests in ./samples. The test target currently only uses internal eval. We should expand that to include tests for the various backends (JavaScript, Java, Cloudant, Spark).

[jeromesimeon]

Some form of testing is essentially done, including for JS and Java backends. Those are now run through CI.