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test/parallel/test-repl-pretty-stack-custom-writer.js

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+'use strict';
+require('../common');
+const { PassThrough } = require('stream');
+const assert = require('assert');
+const repl = require('repl');
+
+{
+  const input = new PassThrough();
+  const output = new PassThrough();
+
+  const r = repl.start({
+    prompt: '',
+    input,
+    output,
+    writer: String,
+    terminal: false,
+    useColors: false
+  });
+
+  r.write('throw new Error("foo[a]")\n');
+  r.close();
+  assert.strictEqual(output.read().toString(), 'Uncaught Error: foo[a]\n');
+}