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node_modules/on-exit-leak-free/test/fixtures/unregister.js

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+'use strict'
+
+const { register, unregister } = require('../..')
+const assert = require('assert')
+
+function setup () {
+  const obj = { foo: 'bar' }
+  register(obj, shutdown)
+  setImmediate(function () {
+    unregister(obj)
+    unregister(obj) // twice, this should not throw
+  })
+}
+
+let shutdownCalled = false
+function shutdown (obj) {
+  shutdownCalled = true
+}
+
+setup()
+
+process.on('exit', function () {
+  assert.strictEqual(shutdownCalled, false)
+})