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node_modules/process-warning/test/jest.test.js

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+/* global test, expect */
+'use strict'
+
+const { createWarning } = require('..')
+
+if (globalThis.test) {
+  test('works with jest', done => {
+    const code = createWarning({
+      name: 'TestDeprecation',
+      code: 'CODE',
+      message: 'Hello world'
+    })
+    code('world')
+
+    // we cannot actually listen to process warning event
+    // because jest messes with it (that's the point of this test)
+    // we can only test it was emitted indirectly
+    // and test no exception is raised
+    setImmediate(() => {
+      expect(code.emitted).toBeTruthy()
+      done()
+    })
+  })
+}