Investigate why tests have to be run in node base jest environment

[tplooker]

jest's default testing environment is jsdom, however when the tests are run for either asm.js or wasm in this environment using

yarn test:asm

OR

yarn test:wasm

errors such as the below are reported.

asm

TypeError: abort is not a function

wasm

RuntimeError: unreachable

To reproduce remove the testEnvironment: "node" from ./jest.config.js and run the tests.