Code coverage for AssemblyScript projects that uses a few simple packages to make visualizing how well your code branches are covered.
First install from npm.
npm install @as-covers/coreNext, add the following transform and entry point to your AssemblyScript compilation.
# uses multiple lines for clarity
asc node_modules/@as-covers/assembly/index.ts
--transform @as-covers/transform/lib/index.js
--explicitStartThese will inject some immutable cover points into your web assembly binary.
The next step is to instantiate the module:
import { Covers } from "@as-covers/glue";
import * as fs from "fs";
import { instantiate } from "@assemblyscript/loader";
// import your web assembly binary
const binary = fs.readFileSync("build/untouched.wasm");
const covers = new Covers();
// Install your imports here
const imports = covers.installImports({});
(async function() {
const loader = await instantiate(binary, imports);
covers.registerLoader(loader);
loader.exports._start();
process.stdout.write(covers.stringify());
}());Covers is designed to work over multiple binary compilations with the transform applied. Each cover point is immutably hashed so that you can test code coverage with different test files.
Just remember to register the loader each time before calling the _start() method.
MIT License
Copyright (c) 2021 Joshua Tenner <tenner.joshua@gmail.com>
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