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test/fixtures/test-runner/coverage-loader/hooks.mjs

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+const sources = {
+// Virtual file. Doesn't exist on disk
+  "virtual.js": `
+  import { test } from 'node:test';
+  test('test', async () => {});
+`,
+// file with source map. this emulates the behavior of tsx
+  "sum.test.ts": `\
+import{describe,it}from"node:test";import assert from"node:assert";import{sum}from"./sum.ts";describe("sum",()=>{it("should sum two numbers",()=>{assert.deepStrictEqual(sum(1,2),3)});it("should error out if one is not a number",()=>{assert.throws(()=>sum(1,"b"),Error)})});
+
+//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJtYXBwaW5ncyI6IkFBQUEsT0FBUyxTQUFVLE9BQVUsWUFDN0IsT0FBTyxXQUFZLGNBQ25CLE9BQVMsUUFBVyxRQUVwQixTQUFTLE1BQU8sSUFBTSxDQUNwQixHQUFHLHlCQUEwQixJQUFNLENBQy9CLE9BQU8sZ0JBQWdCLElBQUksRUFBRSxDQUFDLEVBQUcsQ0FBQyxDQUN0QyxDQUFDLEVBRUQsR0FBRywwQ0FBMkMsSUFBTSxDQUNsRCxPQUFPLE9BQU8sSUFBTSxJQUFJLEVBQUcsR0FBRyxFQUFHLEtBQUssQ0FDeEMsQ0FBQyxDQUNILENBQUMiLCJuYW1lcyI6W10sImlnbm9yZUxpc3QiOltdLCJzb3VyY2VzIjpbIi4vc3VtLnRlc3QudHMiXSwic291cmNlc0NvbnRlbnQiOltudWxsXX0=`,
+// file with source map. this emulates the behavior of tsx
+  "sum.ts": `\
+  var __defProp=Object.defineProperty;var __name=(target,value)=>__defProp(target,"name",{value,configurable:true});function sum(...n){if(!n.every(num=>typeof num==="number"))throw new Error("Not a number");return n.reduce((acc,cur)=>acc+cur)}__name(sum,"sum");export{sum};
+
+  //# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJtYXBwaW5ncyI6ImtIQUFPLFNBQVMsT0FBUSxFQUFHLENBQ3pCLEdBQUksQ0FBQyxFQUFFLE1BQU8sS0FBUSxPQUFPLE1BQVEsUUFBUSxFQUFHLE1BQU0sSUFBSSxNQUFNLGNBQWMsRUFDOUUsT0FBTyxFQUFFLE9BQU8sQ0FBQyxJQUFLLE1BQVEsSUFBTSxHQUFHLENBQ3pDLENBSGdCIiwibmFtZXMiOltdLCJpZ25vcmVMaXN0IjpbXSwic291cmNlcyI6WyIuL3N1bS50cyJdLCJzb3VyY2VzQ29udGVudCI6W251bGxdfQ==`,
+};
+
+export async function load(url, context, nextLoad) {
+  const file = url.split('/').at(-1);
+  if (sources[file] !== undefined) {
+    return { format: "module", source: sources[file], shortCircuit: true };
+  }
+  return nextLoad(url, context);
+}

test/fixtures/test-runner/coverage-loader/register-hooks.js

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+const { register } = require('node:module');
+const { pathToFileURL } = require('node:url');
+
+register('./hooks.mjs', pathToFileURL(__filename));

test/fixtures/test-runner/coverage-loader/sum.test.ts

@@ -0,0 +1,13 @@
+import { describe, it } from 'node:test'
+import assert from 'node:assert'
+import { sum } from './sum'
+
+describe('sum', () => {
+  it('should sum two numbers', () => {
+    assert.deepStrictEqual(sum(1, 2), 3)
+  })
+
+  it('should error out if one is not a number', () => {
+    assert.throws(() => sum(1, 'b'), Error)
+  })
+})

test/fixtures/test-runner/coverage-loader/sum.ts

@@ -0,0 +1,4 @@
+export function sum (...n) {
+  if (!n.every((num) => typeof num === 'number')) throw new Error('Not a number')
+  return n.reduce((acc, cur) => acc + cur)
+}