feat: Initial test case for repl errors

Author: antsmartian

test/test-repl-error.js

@@ -0,0 +1,37 @@
+'use strict';
+
+const assert = require('assert');
+const REPL = require('../src/repl');
+const { Duplex } = require('stream');
+
+global.require = require;
+global.module = module;
+global.REPL = {
+  time: (fn) => {
+  },
+  last: undefined,
+  lastError: undefined,
+};
+
+let output = '';
+const inoutStream = new Duplex({
+  write(chunk, encoding, callback) {
+    output += chunk;
+    callback();
+  },
+
+  read() {
+    this.push("var b = 'invalid\n");
+    this.push(null);
+  },
+});
+
+new REPL(inoutStream, inoutStream);
+
+// Matching only on a minimal piece of the error message because V8 throws
+// the error `SyntaxError: Invalid or unexpected token`, where as
+// ChakraCore throws the error `SyntaxError: Unterminated string constant`.
+const errorMessage = 'SyntaxError:';
+process.on('exit', () => {
+  assert.ok(output.includes(errorMessage),'should throw syntax error');
+});