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node_modules/process-warning/test/emit-once-only.test.js

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+'use strict'
+
+const { test } = require('node:test')
+const { createWarning } = require('..')
+const { withResolvers } = require('./promise')
+
+test('emit should emit a given code only once', t => {
+  t.plan(4)
+
+  const { promise, resolve } = withResolvers()
+
+  process.on('warning', onWarning)
+  function onWarning (warning) {
+    t.assert.deepStrictEqual(warning.name, 'TestDeprecation')
+    t.assert.deepStrictEqual(warning.code, 'CODE')
+    t.assert.deepStrictEqual(warning.message, 'Hello world')
+    t.assert.ok(warn.emitted)
+  }
+
+  const warn = createWarning({
+    name: 'TestDeprecation',
+    code: 'CODE',
+    message: 'Hello world'
+  })
+  warn()
+  warn()
+  setImmediate(() => {
+    process.removeListener('warning', onWarning)
+    resolve()
+  })
+
+  return promise
+})