Run and write tests for integration

[cmfcmf]

• figure out which testing framework is used
• run built-in node tests
• write tests for our integration

[cmfcmf]

The "How to write a test" guide of Node.js can be found here: https://github.com/nodejs/node/blob/master/doc/guides/writing-tests.md

Node.js is using Google Test for C++ unit tests, as well as simple JavaScript files as test cases. JavaScript tests look like they are preferred, but obviously can't be used for everything (i.e. embedding Node.js 😄 ).

[msoechting]

Current progress of tests (tests branch):

• Running configure --shared followed by make cctest results in the following error:

Makefile:279 recipe for target test/addons/.docbuildstamp failed

• Running configure followed by make cctest successfully executed the currently existing tests. But, when calling node::lib::Initialize() in one of the tests, the following error occurs:

bootstrap_node.js:511
  const ContextifyScript = process.binding('contextify').ContextifyScript;
                                   ^

Error: No such module: contextify
    at bootstrap_node.js:511:36

[justus-hildebrand]

The test/addons/.docbuildstamp target fails, because make test-only tries to run node as an executable: ./node tools/doc/addon-verify.js. When building node as a shared library, however, there is no executable to be executed, which in turn results in the tests failing.

make cctest fails for the same reason: make tries to run cctest (an executable), but it gets built as a shared lib and therfore fails. I have not looked into what cctest is, but if we manage to build it as an exe that tests the lib, maaaybe we're good to go here.