AssemblyScript loader experiments (#13)

packages/graph-node/src/index.test.ts

@@ -3,13 +3,43 @@
 //
 
 import path from 'path';
+import { expect } from 'chai';
 
 import { instantiate } from './index';
 
 const WASM_FILE_PATH = '../build/debug.wasm';
 
-it('should execute exported function', async () => {
-  const filePath = path.resolve(__dirname, WASM_FILE_PATH);
-  const { exports } = await instantiate(filePath);
-  exports.callGraphAPI();
+describe('wasm loader tests', () => {
+  let exports: any;
+
+  before(async () => {
+    const filePath = path.resolve(__dirname, WASM_FILE_PATH);
+    const instance = await instantiate(filePath);
+    exports = instance.exports;
+  });
+
+  it('should execute exported function', async () => {
+    const { callGraphAPI } = exports;
+    callGraphAPI();
+  });
+
+  it('should use a class/instance created in wasm from JS', async () => {
+    const { Foo, __getString, __pin, __unpin } = exports;
+
+    const fooPtr = __pin(Foo.getFoo());
+    const foo = Foo.wrap(fooPtr);
+    const strPtr = foo.getString();
+    expect(__getString(strPtr)).to.equal('hello world!');
+    __unpin(fooPtr);
+  });
+
+  it('should instantiate a class in wasm from JS', async () => {
+    const { Foo, FooID, __getString, __new, __pin, __unpin } = exports;
+
+    const newFooPtr = __pin(__new(FooID));
+    const newFoo = Foo.wrap(newFooPtr);
+    const newStrPtr = newFoo.getString();
+    expect(__getString(newStrPtr)).to.equal('hello world!');
+    __unpin(newFooPtr);
+  });
 });