Use Wasm file from mdn examples

Author: kachkaev

e2e/__tests__/__snapshots__/nativeEsm.test.ts.snap

@@ -8,7 +8,7 @@ Time:        <<REPLACED>>
 Ran all test suites matching /native-esm-deep-cjs-reexport.test.js/i."
 `;
 
-exports[`runs Wasm test with native ESM 1`] = `
+exports[`runs WebAssembly (Wasm) test with native ESM 1`] = `
 "Test Suites: 1 passed, 1 total
 Tests:       4 passed, 4 total
 Snapshots:   0 total

e2e/__tests__/nativeEsm.test.ts

@@ -68,7 +68,7 @@ onNodeVersions('>=16.9.0', () => {
   });
 });
 
-test('runs Wasm test with native ESM', () => {
+test('runs WebAssembly (Wasm) test with native ESM', () => {
   const {exitCode, stderr, stdout} = runJest(DIR, ['native-esm-wasm.test.js'], {
     nodeOptions: '--experimental-vm-modules --no-warnings',
   });

e2e/native-esm/42.wasm

@@ -8,20 +8,36 @@
 // the point here is that it's the node core module
 // eslint-disable-next-line no-restricted-imports
 import {readFileSync} from 'fs';
-// The file was generated by wasm-pack
-import {getAnswer} from '../42.wasm';
+// file origin: https://github.com/mdn/webassembly-examples/blob/2f2163287f86fe29deb162335bccca7d5d95ca4f/understanding-text-format/add.wasm
+// source code: https://github.com/mdn/webassembly-examples/blob/2f2163287f86fe29deb162335bccca7d5d95ca4f/understanding-text-format/add.was
+import {add} from '../add.wasm';
 
-const wasmFileBuffer = readFileSync('42.wasm');
+const wasmFileBuffer = readFileSync('add.wasm');
 
 test('supports native wasm imports', () => {
-  expect(getAnswer()).toBe(42);
+  expect(add(1, 2)).toBe(3);
+
+  // because arguments are i32 (signed), fractional part is truncated
+  expect(add(0.99, 1.01)).toBe(1);
+
+  // because return value is i32 (signed), (2^31 - 1) + 1 overflows and becomes -2^31
+  expect(add(Math.pow(2, 31) - 1, 1)).toBe(-Math.pow(2, 31));
+
+  // invalid or missing arguments are treated as 0
+  expect(add('hello', 'world')).toBe(0);
+  expect(add()).toBe(0);
+  expect(add(null)).toBe(0);
+  expect(add({}, [])).toBe(0);
+
+  // redundant arguments are silently ignored
+  expect(add(1, 2, 3)).toBe(3);
 });
 
 test('supports imports from "data:application/wasm" URI with base64 encoding', async () => {
   const importedWasmModule = await import(
     `data:application/wasm;base64,${wasmFileBuffer.toString('base64')}`
   );
-  expect(importedWasmModule.getAnswer()).toBe(42);
+  expect(importedWasmModule.add(0, 42)).toBe(42);
 });
 
 test('imports from "data:text/wasm" URI without explicit encoding fail', async () => {