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test/parallel/test-fs-read-stream-patch-open.js

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+'use strict';
+const common = require('../common');
+const fs = require('fs');
+
+common.expectWarning(
+  'DeprecationWarning',
+  'ReadStream.prototype.open() is deprecated', 'DEP0135');
+const s = fs.createReadStream('asd')
+  // We don't care about errors in this test.
+  .on('error', () => {});
+s.open();
+
+process.nextTick(() => {
+  // Allow overriding open().
+  fs.ReadStream.prototype.open = common.mustCall();
+  fs.createReadStream('asd');
+});