WIP: Add integration and unit tests so they trigger CI

[ltfschoen]

Relates to #9

[ltfschoen]

This isn't triggering the CI properly either

[ltfschoen]

Why is test suite failing with this kind of error. Are we using wrong version of Rust?

   Compiling js-sys v0.3.35
error[E0603]: struct `Memory` is private
    --> /home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/js-sys-0.3.35/src/lib.rs:4873:60
     |
4873 |                 let mem = buf.unchecked_ref::<WebAssembly::Memory>();
     |                                                            ^^^^^^ this struct is private
     |
note: the struct `Memory` is defined here

[ltfschoen]

Closing, as will include in #29