How to test a server side debugOnly package - testing

Question

I don't understand how it is possible to test a package that is debugOnly.
My package.js is quite simple :
Package.describe({
name: 'lambda',
version: '0.0.1',
debugOnly: true // Will not be packaged into the production build
});
Package.onUse(function(api) {
api.versionsFrom('1.2.1');
api.addFiles('lambda.js');
api.export("Lambda", 'server');
});
Package.onTest(function(api) {
api.use('tinytest');
api.use('lambda');
api.addFiles('lambda-tests.js', 'server');
});
My lambda-test.js :
Tinytest.add('example', function (test) {
test.equal(Lambda.func(), true);
});
My lambda.js :
Lambda = {
func: function() {
return "Christmas";
}
}
When I run meteor test-packages, it just fails : Lambda is not defined. If I remove the debugOnly: true the test pass. So how can I test my package using tinytest ?
Or this is a bug !

Answer 1

I had the same issue! It turns out the tests are working fine. The Lambda is not getting exported in the project either.
from https://github.com/meteor/meteor/blob/0f0c5d3bb3a5492254cd0843339a6716ef65fce1/tools/isobuild/compiler.js
// don't import symbols from debugOnly and prodOnly packages, because
// if the package is not linked it will cause a runtime error.
// the code must access them with `Package["my-package"].MySymbol`.
Try:
Tinytest.add('example', function (test) {
//also changed expected value from true to Christmas to make test pass
test.equal(Package['lambda']['Lambda'].func(), "Christmas");
//you can use Package['lambda'].Lambda as well, but my IDE complains
});
Now you can do something like this:
if (Package['lambda']) {
console.log("we are in debug mode and we have lamda");
console.log("does this say Christmas? " + Package['lambda']["Lambda"]['func']());
} else {
console.log("we are in production mode, or we have not installed lambda");
}