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test: check that pending warning is emitted once

Code for the new --pending-deprecation flag contains logic to make sure
the deprecation warning is emitted only once. However, this was not
being tested. Add test coverage for this situation.

PR-URL: #12527
Reviewed-By: Luigi Pinca <>
Reviewed-By: Daniel Bevenius <>
Reviewed-By: Colin Ihrig <>
Reviewed-By: James M Snell <>
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Trott authored and jasnell committed Apr 20, 2017
1 parent 6ee6aae commit 75bfdad0371444ec4aa69a6f60062d0d6f0fe9ad
Showing with 6 additions and 0 deletions.
  1. +6 −0 test/parallel/test-buffer-pending-deprecation.js
@@ -12,4 +12,10 @@ const bufferWarning = 'The Buffer() and new Buffer() constructors are not ' +

common.expectWarning('DeprecationWarning', bufferWarning);

// This is used to make sure that a warning is only emitted once even though
// `new Buffer()` is called twice.
process.on('warning', common.mustCall());

new Buffer(10);

new Buffer(10);

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