Add test spec demonstrating bug reported in #22428

system-tests/projects/plugin-run-events-multiple/cypress.config.js

@@ -0,0 +1,77 @@
+/* eslint-disable no-console */
+const EventEmitter = require('events')
+
+class EventBugFix {
+  constructor (on_reference) {
+    this.emitter = new EventEmitter()
+    this.on_reference = on_reference
+    this.proxied_events = [
+      'before:run',
+      'after:run',
+      'before:spec',
+      'after:spec',
+    ]
+
+    this.proxied_events.forEach((event) => {
+      on_reference(event, (...args) => {
+        this.emitter.emit(event, ...args)
+      })
+    })
+  }
+  on (event, ...args) {
+    if (this.proxied_events.indexOf(event) !== -1) {
+      this.emitter.on(event, ...args)
+    } else {
+      this.on_reference(event, ...args)
+    }
+  }
+}
+
+module.exports = {
+  'fixturesFolder': false,
+  'e2e': {
+    'supportFile': false,
+    setupNodeEvents (on, config) {
+      // Run test with RUN_MULTIPLE_PASS=true to show test pass
+      if (process.env.RUN_MULTIPLE_PASS) {
+        const _bugFix = new EventBugFix(on)
+
+        on = _bugFix.on.bind(_bugFix)
+      }
+
+      on('before:run', (runDetails) => {
+        console.log('before:run first handler')
+      })
+
+      on('before:run', (runDetails) => {
+        console.log('before:run second handler')
+      })
+
+      on('after:run', (results) => {
+        console.log('after:run first handler')
+      })
+
+      on('after:run', (results) => {
+        console.log('after:run second handler')
+      })
+
+      on('before:spec', (spec) => {
+        console.log('before:spec first handler')
+      })
+
+      on('before:spec', (spec) => {
+        console.log('before:spec second handler')
+      })
+
+      on('after:spec', (spec, results) => {
+        console.log('after:spec first handler')
+      })
+
+      on('after:spec', (spec, results) => {
+        console.log('after:spec second handler')
+      })
+
+      return config
+    },
+  },
+}

system-tests/projects/plugin-run-events-multiple/cypress/e2e/run_events_spec_1.cy.js

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+it('is true', () => {})

system-tests/projects/plugin-run-events-multiple/cypress/e2e/run_events_spec_2.cy.js

@@ -0,0 +1 @@
+it('is true', () => {})

system-tests/test/plugin_run_events_multiple_spec.ts

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+import systemTests, { expect } from '../lib/system-tests'
+
+describe('e2e plugin run events', () => {
+  systemTests.setup()
+  const events = ['before:run', 'after:run', 'before:spec', 'after:spec']
+
+  events.forEach((event) => {
+    systemTests.it(`${event} supports multiple event listeners`, {
+      browser: 'electron',
+      project: 'plugin-run-events-multiple',
+      spec: '*',
+      snapshot: false,
+      config: {
+        video: false,
+      },
+      async onRun (exec) {
+        const res = await exec()
+        const normOut = systemTests.normalizeStdout(res.stdout)
+
+        expect(normOut).to.contain(`${event} first handler`)
+        expect(normOut).to.contain(`${event} second handler`)
+      },
+    })
+  })
+})