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test/parallel/test-error-aggregateTwoErrors.js

@@ -0,0 +1,71 @@
+// Flags: --expose-internals
+'use strict';
+
+require('../common');
+const assert = require('assert');
+const { aggregateTwoErrors } = require('internal/errors');
+
+assert.strictEqual(aggregateTwoErrors(null, null), null);
+
+{
+  const err = new Error();
+  assert.strictEqual(aggregateTwoErrors(null, err), err);
+}
+
+{
+  const err = new Error();
+  assert.strictEqual(aggregateTwoErrors(err, null), err);
+}
+
+{
+  const err0 = new Error('original');
+  const err1 = new Error('second error');
+
+  err0.code = 'ERR0';
+  err1.code = 'ERR1';
+
+  const chainedError = aggregateTwoErrors(err1, err0);
+  assert.strictEqual(chainedError.message, err0.message);
+  assert.strictEqual(chainedError.code, err0.code);
+  assert.deepStrictEqual(chainedError.errors, [err0, err1]);
+}
+
+{
+  const err0 = new Error('original');
+  const err1 = new Error('second error');
+  const err2 = new Error('third error');
+
+  err0.code = 'ERR0';
+  err1.code = 'ERR1';
+  err2.code = 'ERR2';
+
+  const chainedError = aggregateTwoErrors(err2, aggregateTwoErrors(err1, err0));
+  assert.strictEqual(chainedError.message, err0.message);
+  assert.strictEqual(chainedError.code, err0.code);
+  assert.deepStrictEqual(chainedError.errors, [err0, err1, err2]);
+}
+
+{
+  const err0 = new Error('original');
+  const err1 = new Error('second error');
+
+  err0.code = 'ERR0';
+  err1.code = 'ERR1';
+
+  const chainedError = aggregateTwoErrors(null, aggregateTwoErrors(err1, err0));
+  assert.strictEqual(chainedError.message, err0.message);
+  assert.strictEqual(chainedError.code, err0.code);
+  assert.deepStrictEqual(chainedError.errors, [err0, err1]);
+}
+
+{
+  const err0 = new Error('original');
+  const err1 = new Error('second error');
+
+  err0.code = 'ERR0';
+  err1.code = 'ERR1';
+
+  const chainedError = aggregateTwoErrors(null, aggregateTwoErrors(err1, err0));
+  const stack = chainedError.stack.split('\n');
+  assert.match(stack[1], /^ {4}at Object/);
+}