Add tests for line numbers in stack traces

PR-URL: #102

Author: tshemsedinov

test/examples/.eslintrc.json

@@ -1,5 +1,8 @@
 {
   "parserOptions": {
     "sourceType": "module"
+  },
+  "globals": {
+    "unknownFunction": "readonly"
   }
 }

test/examples/referenceError.js

@@ -0,0 +1,4 @@
+async () => {
+  const result = unknownFunction();
+  return result;
+};

test/examples/useStrict.cjs

@@ -0,0 +1,6 @@
+'use strict';
+
+async () => {
+  const result = unknownFunction();
+  return result;
+};

test/unit.js

@@ -168,6 +168,46 @@ metatests.test('Syntax error', async (test) => {
   test.end();
 });
 
+metatests.test('Reference error', async (test) => {
+  const filePath = path.join(examples, 'referenceError.js');
+  try {
+    const script = await metavm.readScript(filePath);
+    await script.exports();
+    test.fail();
+  } catch (err) {
+    test.strictSame(err.constructor.name, 'ReferenceError');
+  }
+  test.end();
+});
+
+metatests.test('Line number', async (test) => {
+  {
+    const filePath = path.join(examples, 'referenceError.js');
+    try {
+      const script = await metavm.readScript(filePath);
+      await script.exports();
+      test.fail();
+    } catch (err) {
+      const [, firstLine] = err.stack.split('\n');
+      const [, lineNumber] = firstLine.split(':');
+      test.strictSame(parseInt(lineNumber, 10), 2);
+    }
+  }
+  {
+    const filePath = path.join(examples, 'useStrict.cjs');
+    try {
+      const script = await metavm.readScript(filePath);
+      await script.exports();
+      test.fail();
+    } catch (err) {
+      const [, firstLine] = err.stack.split('\n');
+      const [, lineNumber] = firstLine.split(':');
+      test.strictSame(parseInt(lineNumber, 10), 4);
+    }
+  }
+  test.end();
+});
+
 metatests.test('Create default context', async (test) => {
   const context = metavm.createContext();
   test.strictSame(Object.keys(context), []);