Add tests for the pageleave script (#4744)

* move util function to util module

* move playwright config file to tracker dir root

* update Playwright + add gitignores

* Playwright: enable reuseExistingServer (non-CI env)

* store tracker src copies to avoid re-compilation in dev env

* test pageleave on simple navigation

* fix test util fn

* rename local_test npm script

* make test util able to expect multiple requests

* test pageleaves in SPAs

* test pageleave with manual URL

* test pageleave not sent in manual when pageview not triggered

* extend util fn to refute event requests

* test pageleaves not sent in excluded hash pages

* store hashes instead of file copies to detect /tracker/src changes

* drop async

* speed up test suite

.gitignore

@@ -35,6 +35,16 @@ npm-debug.log
 /assets/node_modules/
 /tracker/node_modules/
 
+# Files generated by Playwright when running tracker tests
+/tracker/test-results/
+/tracker/playwright-report/
+/tracker/blob-report/
+/tracker/playwright/.cache/
+
+# Stored hash of source tracker files used in development environment
+# to detect changes in /tracker/src and avoid unnecessary compilation.
+/tracker/dev-compile/last-hash.txt
+
 # test coverage directory
 /assets/coverage
 

tracker/compile.js

@@ -3,6 +3,12 @@ const fs = require('fs')
 const path = require('path')
 const Handlebars = require("handlebars");
 const g = require("generatorics");
+const { canSkipCompile } = require("./dev-compile/can-skip-compile");
+
+if (process.env.NODE_ENV === 'dev' && canSkipCompile()) {
+  console.info('COMPILATION SKIPPED: No changes detected in tracker dependencies')
+  process.exit(0)
+}
 
 Handlebars.registerHelper('any', function (...args) {
   return args.slice(0, -1).some(Boolean)

tracker/dev-compile/can-skip-compile.js

@@ -0,0 +1,52 @@
+const fs = require('fs');
+const path = require('path');
+const crypto = require('crypto');
+
+const LAST_HASH_FILEPATH = path.join(__dirname, './last-hash.txt')
+
+// Re-compilation is only required if any of these files have been changed. 
+const COMPILE_DEPENDENCIES = [
+  path.join(__dirname, '../compile.js'),
+  path.join(__dirname, '../src/plausible.js'),
+  path.join(__dirname, '../src/customEvents.js')
+]
+
+function currentHash() {
+  const combinedHash = crypto.createHash('sha256');
+
+  for (const filePath of COMPILE_DEPENDENCIES) {
+    try {
+      const fileContent = fs.readFileSync(filePath);
+      const fileHash = crypto.createHash('sha256').update(fileContent).digest();
+      combinedHash.update(fileHash);
+    } catch (error) {
+      throw new Error(`Failed to read or hash ${filePath}: ${error.message}`);
+    }
+  }
+
+  return combinedHash.digest('hex');
+}
+
+function lastHash() {
+  if (fs.existsSync(LAST_HASH_FILEPATH)) {
+    return fs.readFileSync(LAST_HASH_FILEPATH).toString()
+  }
+}
+
+/**
+ * Returns a boolean indicating whether the tracker compilation can be skipped.
+ * Every time this function gets executed, the hash of the tracker dependencies
+ * will be updated. Compilation can be skipped if the hash hasn't changed since
+ * the last execution.
+ */
+exports.canSkipCompile = function() {
+  const current = currentHash()
+  const last = lastHash()
+
+  if (current === last) {
+    return true
+  } else {
+    fs.writeFileSync(LAST_HASH_FILEPATH, current)
+    return false
+  }
+}

tracker/package-lock.json

@@ -6,13 +6,14 @@
     "": {
       "license": "MIT",
       "dependencies": {
-        "@playwright/test": "^1.41.1",
         "express": "^4.18.1",
         "generatorics": "^1.1.0",
         "handlebars": "^4.7.8",
         "uglify-js": "^3.9.4"
       },
       "devDependencies": {
+        "@playwright/test": "^1.48.1",
+        "@types/node": "^22.7.7",
         "eslint": "^8.56.0",
         "eslint-plugin-playwright": "^0.20.0"
       }
@@ -151,17 +152,27 @@
       }
     },
     "node_modules/@playwright/test": {
-      "version": "1.41.1",
+      "version": "1.48.1",
-      "resolved": "https://registry.npmjs.org/@playwright/test/-/test-1.41.1.tgz",
+      "resolved": "https://registry.npmjs.org/@playwright/test/-/test-1.48.1.tgz",
-      "integrity": "sha512-9g8EWTjiQ9yFBXc6HjCWe41msLpxEX0KhmfmPl9RPLJdfzL4F0lg2BdJ91O9azFdl11y1pmpwdjBiSxvqc+btw==",
+      "integrity": "sha512-s9RtWoxkOLmRJdw3oFvhFbs9OJS0BzrLUc8Hf6l2UdCNd1rqeEyD4BhCJkvzeEoD1FsK4mirsWwGerhVmYKtZg==",
+      "dev": true,
       "dependencies": {
-        "playwright": "1.41.1"
+        "playwright": "1.48.1"
       },
       "bin": {
         "playwright": "cli.js"
       },
       "engines": {
-        "node": ">=16"
+        "node": ">=18"
+      }
+    },
+    "node_modules/@types/node": {
+      "version": "22.7.7",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-22.7.7.tgz",
+      "integrity": "sha512-SRxCrrg9CL/y54aiMCG3edPKdprgMVGDXjA3gB8UmmBW5TcXzRUYAh8EWzTnSJFAd1rgImPELza+A3bJ+qxz8Q==",
+      "dev": true,
+      "dependencies": {
+        "undici-types": "~6.19.2"
       }
     },
     "node_modules/@ungap/structured-clone": {
@@ -855,6 +866,7 @@
       "version": "2.3.2",
       "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.2.tgz",
       "integrity": "sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==",
+      "dev": true,
       "hasInstallScript": true,
       "optional": true,
       "os": [
@@ -1395,31 +1407,33 @@
       "integrity": "sha512-5DFkuoqlv1uYQKxy8omFBeJPQcdoE07Kv2sferDCrAq1ohOU+MSDswDIbnx3YAM60qIOnYa53wBhXW0EbMonrQ=="
     },
     "node_modules/playwright": {
-      "version": "1.41.1",
+      "version": "1.48.1",
-      "resolved": "https://registry.npmjs.org/playwright/-/playwright-1.41.1.tgz",
+      "resolved": "https://registry.npmjs.org/playwright/-/playwright-1.48.1.tgz",
-      "integrity": "sha512-gdZAWG97oUnbBdRL3GuBvX3nDDmUOuqzV/D24dytqlKt+eI5KbwusluZRGljx1YoJKZ2NRPaeWiFTeGZO7SosQ==",
+      "integrity": "sha512-j8CiHW/V6HxmbntOfyB4+T/uk08tBy6ph0MpBXwuoofkSnLmlfdYNNkFTYD6ofzzlSqLA1fwH4vwvVFvJgLN0w==",
+      "dev": true,
       "dependencies": {
-        "playwright-core": "1.41.1"
+        "playwright-core": "1.48.1"
       },
       "bin": {
         "playwright": "cli.js"
       },
       "engines": {
-        "node": ">=16"
+        "node": ">=18"
       },
       "optionalDependencies": {
         "fsevents": "2.3.2"
       }
     },
     "node_modules/playwright-core": {
-      "version": "1.41.1",
+      "version": "1.48.1",
-      "resolved": "https://registry.npmjs.org/playwright-core/-/playwright-core-1.41.1.tgz",
+      "resolved": "https://registry.npmjs.org/playwright-core/-/playwright-core-1.48.1.tgz",
-      "integrity": "sha512-/KPO5DzXSMlxSX77wy+HihKGOunh3hqndhqeo/nMxfigiKzogn8kfL0ZBDu0L1RKgan5XHCPmn6zXd2NUJgjhg==",
+      "integrity": "sha512-Yw/t4VAFX/bBr1OzwCuOMZkY1Cnb4z/doAFSwf4huqAGWmf9eMNjmK7NiOljCdLmxeRYcGPPmcDgU0zOlzP0YA==",
+      "dev": true,
       "bin": {
         "playwright-core": "cli.js"
       },
       "engines": {
-        "node": ">=16"
+        "node": ">=18"
       }
     },
     "node_modules/prelude-ls": {
@@ -1796,6 +1810,12 @@
         "node": ">=0.8.0"
       }
     },
+    "node_modules/undici-types": {
+      "version": "6.19.8",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.19.8.tgz",
+      "integrity": "sha512-ve2KP6f/JnbPBFyobGHuerC9g1FYGn/F8n1LWTwNxCEzd6IfqTwUQcNXgEtmmQ6DlRrC1hrSrBnCZPokRrDHjw==",
+      "dev": true
+    },
     "node_modules/unpipe": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",

tracker/package.json

@@ -1,19 +1,21 @@
 {
   "scripts": {
     "deploy": "node compile.js",
-    "test": "npm run deploy && npx playwright test --config=./test/support/playwright.config.js",
+    "test": "npm run deploy && npx playwright test",
+    "test:local": "NODE_ENV=dev npm run deploy && npx playwright test",
     "report-sizes": "node report-sizes.js",
     "start": "node test/support/server.js"
   },
   "license": "MIT",
   "dependencies": {
-    "@playwright/test": "^1.41.1",
     "express": "^4.18.1",
     "generatorics": "^1.1.0",
     "handlebars": "^4.7.8",
     "uglify-js": "^3.9.4"
   },
   "devDependencies": {
+    "@playwright/test": "^1.48.1",
+    "@types/node": "^22.7.7",
     "eslint": "^8.56.0",
     "eslint-plugin-playwright": "^0.20.0"
   }

tracker/playwright.config.js

@@ -1,10 +1,11 @@
-const { devices } = require('@playwright/test');
+// @ts-check
+const { defineConfig, devices } = require('@playwright/test');
 
 /**
  * @see https://playwright.dev/docs/test-configuration
  */
-module.exports = {
+module.exports = defineConfig({
-  testDir: '../',
+  testDir: './test',
   timeout: 60 * 1000,
   fullyParallel: true,
   /* Fail the build on CI if you accidentally left test.only in the source code. */
@@ -33,5 +34,7 @@ module.exports = {
   webServer: {
     command: 'npm run start',
     port: 3000,
+    reuseExistingServer: !process.env.CI
   },
-}
+});
+

tracker/test/fixtures/pageleave-hash-exclusions.html

@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <meta http-equiv="X-UA-Compatible" content="ie=edge">
+  <title>Plausible Playwright tests</title>
+  <script defer data-exclude='/*#*/hash/**/ignored' src="/tracker/js/plausible.exclusions.hash.local.pageleave.js"></script>
+</head>
+
+<body>
+  <a id="ignored-hash-link" href="#this/hash/should/be/ignored">Ignored Hash Link</a>
+  <a id="hash-link-1" href="#hash1">Hash Link 1</a>
+  <a id="hash-link-2" href="#hash2">Hash Link 2</a>
+</body>
+
+</html>

tracker/test/fixtures/pageleave-hash.html

@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <meta http-equiv="X-UA-Compatible" content="ie=edge">
+  <title>Plausible Playwright tests</title>
+  <script defer src="/tracker/js/plausible.hash.local.pageleave.js"></script>
+  <script>
+
+  </script>
+</head>
+
+<body>
+  <a id="hash-nav" href="#some-hash">Hash link</a>
+</body>
+
+</html>

tracker/test/fixtures/pageleave-manual.html

@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <meta http-equiv="X-UA-Compatible" content="ie=edge">
+  <title>Plausible Playwright tests</title>
+  <script defer src="/tracker/js/plausible.local.manual.pageleave.js"></script>
+  <script>window.plausible = window.plausible || function() { (window.plausible.q = window.plausible.q || []).push(arguments) }</script>
+</head>
+
+<body>
+  <a id="navigate-away" href="/manual.html">Navigate away</a>
+
+  <button id="pageview-trigger-custom-url">
+    Triggers a pageview with custom URL
+  </button>
+
+  <script>
+    document.addEventListener('click', (e) => {
+      if (e.target.id === 'pageview-trigger-custom-url') {
+        window.plausible('pageview', {u: 'https://example.com/custom/location'})
+      }
+    })
+  </script>
+</body>
+
+</html>

tracker/test/fixtures/pageleave.html

@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <meta http-equiv="X-UA-Compatible" content="ie=edge">
+  <title>Plausible Playwright tests</title>
+  <script defer src="/tracker/js/plausible.local.pageleave.js"></script>
+</head>
+
+<body>
+  <a id="navigate-away" href="/manual.html">Navigate away</a>
+
+  <button id="history-nav">Navigate with history</button>
+
+  <script>
+    document.getElementById('history-nav').addEventListener('click', () => {
+      history.pushState({ page: 2 }, 'Another Page', '/another-page');
+    });
+  </script>
+</body>
+
+</html>

tracker/test/manual.spec.js

@@ -1,35 +1,34 @@
-const { mockRequest } = require('./support/test-utils')
+/* eslint-disable playwright/expect-expect */
-const { expect, test } = require('@playwright/test');
+const { clickPageElementAndExpectEventRequests } = require('./support/test-utils')
+const { test } = require('@playwright/test');
 const { LOCAL_SERVER_ADDR } = require('./support/server');
 
-async function clickPageElementAndExpectEventRequest(page, buttonId, expectedBodyParams) {
-  const plausibleRequestMock = mockRequest(page, '/api/event')
-  await page.click(buttonId)
-  const plausibleRequest = await plausibleRequestMock;
-
-  expect(plausibleRequest.url()).toContain('/api/event')
-
-  const body = plausibleRequest.postDataJSON()
-
-  Object.keys(expectedBodyParams).forEach((key) => {
-    expect(body[key]).toEqual(expectedBodyParams[key])
-  })
-}
-
 test.describe('manual extension', () => {
   test('can trigger custom events with and without a custom URL if pageview was sent with the default URL', async ({ page }) => {
     await page.goto('/manual.html');
 
-    await clickPageElementAndExpectEventRequest(page, '#pageview-trigger', {n: 'pageview', u: `${LOCAL_SERVER_ADDR}/manual.html`})
+    await clickPageElementAndExpectEventRequests(page, '#pageview-trigger', [
-    await clickPageElementAndExpectEventRequest(page, '#custom-event-trigger', {n: 'CustomEvent', u: `${LOCAL_SERVER_ADDR}/manual.html`})
+      {n: 'pageview', u: `${LOCAL_SERVER_ADDR}/manual.html`}
-    await clickPageElementAndExpectEventRequest(page, '#custom-event-trigger-custom-url', {n: 'CustomEvent', u: `https://example.com/custom/location`})
+    ])
+    await clickPageElementAndExpectEventRequests(page, '#custom-event-trigger', [
+      {n: 'CustomEvent', u: `${LOCAL_SERVER_ADDR}/manual.html`}
+    ])
+    await clickPageElementAndExpectEventRequests(page, '#custom-event-trigger-custom-url', [
+      {n: 'CustomEvent', u: `https://example.com/custom/location`}
+    ])
   });
 
   test('can trigger custom events with and without a custom URL if pageview was sent with a custom URL', async ({ page }) => {
     await page.goto('/manual.html');
 
-    await clickPageElementAndExpectEventRequest(page, '#pageview-trigger-custom-url', {n: 'pageview', u: `https://example.com/custom/location`})
+    await clickPageElementAndExpectEventRequests(page, '#pageview-trigger-custom-url', [
-    await clickPageElementAndExpectEventRequest(page, '#custom-event-trigger', {n: 'CustomEvent', u: `${LOCAL_SERVER_ADDR}/manual.html`})
+      {n: 'pageview', u: `https://example.com/custom/location`}
-    await clickPageElementAndExpectEventRequest(page, '#custom-event-trigger-custom-url', {n: 'CustomEvent', u: `https://example.com/custom/location`})
+    ])
+    await clickPageElementAndExpectEventRequests(page, '#custom-event-trigger', [
+      {n: 'CustomEvent', u: `${LOCAL_SERVER_ADDR}/manual.html`}
+    ])
+    await clickPageElementAndExpectEventRequests(page, '#custom-event-trigger-custom-url', [
+      {n: 'CustomEvent', u: `https://example.com/custom/location`}
+    ])
   });
 });

tracker/test/pageleave.spec.js

@@ -0,0 +1,95 @@
+/* eslint-disable playwright/expect-expect */
+/* eslint-disable playwright/no-skipped-test */
+const { clickPageElementAndExpectEventRequests, mockRequest } = require('./support/test-utils')
+const { test, expect } = require('@playwright/test');
+const { LOCAL_SERVER_ADDR } = require('./support/server');
+
+test.describe('pageleave extension', () => {
+  test.skip(({browserName}) => browserName === 'webkit', 'Not testable on Webkit');
+
+  test('sends a pageleave when navigating to the next page', async ({ page }) => {
+    const pageviewRequestMock = mockRequest(page, '/api/event')
+    await page.goto('/pageleave.html');
+    await pageviewRequestMock;
+
+    await clickPageElementAndExpectEventRequests(page, '#navigate-away', [
+      {n: 'pageleave', u: `${LOCAL_SERVER_ADDR}/pageleave.html`}
+    ])
+  });
+
+  test('sends pageleave and pageview on hash-based SPA navigation', async ({ page }) => {
+    const pageviewRequestMock = mockRequest(page, '/api/event')
+    await page.goto('/pageleave-hash.html');
+    await pageviewRequestMock;
+
+    await clickPageElementAndExpectEventRequests(page, '#hash-nav', [
+      {n: 'pageleave', u: `${LOCAL_SERVER_ADDR}/pageleave-hash.html`},
+      {n: 'pageview', u: `${LOCAL_SERVER_ADDR}/pageleave-hash.html#some-hash`}
+    ])
+  });
+
+  test('sends pageleave and pageview on history-based SPA navigation', async ({ page }) => {
+    const pageviewRequestMock = mockRequest(page, '/api/event')
+    await page.goto('/pageleave.html');
+    await pageviewRequestMock;
+
+    await clickPageElementAndExpectEventRequests(page, '#history-nav', [
+      {n: 'pageleave', u: `${LOCAL_SERVER_ADDR}/pageleave.html`},
+      {n: 'pageview', u: `${LOCAL_SERVER_ADDR}/another-page`}
+    ])
+  });
+
+  test('sends pageleave with the manually overridden URL', async ({ page }) => {
+    await page.goto('/pageleave-manual.html');
+
+    await clickPageElementAndExpectEventRequests(page, '#pageview-trigger-custom-url', [
+      {n: 'pageview', u: 'https://example.com/custom/location'}
+    ])
+
+    await clickPageElementAndExpectEventRequests(page, '#navigate-away', [
+      {n: 'pageleave', u: 'https://example.com/custom/location'}
+    ])
+  });
+
+  test('does not send pageleave when pageview was not sent in manual mode', async ({ page }) => {
+    await page.goto('/pageleave-manual.html');
+
+    await clickPageElementAndExpectEventRequests(page, '#navigate-away', [], [
+      {n: 'pageleave'}
+    ])
+  });
+
+  test('script.exclusions.hash.pageleave.js sends pageleave only from URLs where a pageview was sent', async ({ page }) => {
+    const pageBaseURL = `${LOCAL_SERVER_ADDR}/pageleave-hash-exclusions.html`
+    
+    const pageviewRequestMock = mockRequest(page, '/api/event')
+    await page.goto('/pageleave-hash-exclusions.html');
+    await pageviewRequestMock;
+
+    // After the initial pageview is sent, navigate to ignored page ->
+    // pageleave event is sent from the initial page URL
+    await clickPageElementAndExpectEventRequests(page, '#ignored-hash-link', [
+      {n: 'pageleave', u: pageBaseURL, h: 1}
+    ])
+
+    // Navigate from ignored page to a tracked page ->
+    // no pageleave from the current page, pageview on the next page
+    await clickPageElementAndExpectEventRequests(
+      page,
+      '#hash-link-1',
+      [{n: 'pageview', u: `${pageBaseURL}#hash1`, h: 1}],
+      [{n: 'pageleave'}]
+    )
+
+    // Navigate from a tracked page to another tracked page ->
+    // pageleave with the last page URL, pageview with the new URL
+    await clickPageElementAndExpectEventRequests(
+      page,
+      '#hash-link-2',
+      [
+        {n: 'pageleave', u: `${pageBaseURL}#hash1`, h: 1},
+        {n: 'pageview', u: `${pageBaseURL}#hash2`, h: 1}
+      ],
+    )
+  });
+});

tracker/test/support/test-utils.js

@@ -1,10 +1,10 @@
 const { expect } = require("@playwright/test");
 
 // Mocks an HTTP request call with the given path. Returns a Promise that resolves to the request
-// data. If the request is not made, resolves to null after 10 seconds.
+// data. If the request is not made, resolves to null after 3 seconds.
-exports.mockRequest = function (page, path) {
+const mockRequest = function (page, path) {
   return new Promise((resolve, _reject) => {
-    const requestTimeoutTimer = setTimeout(() => resolve(null), 10000)
+    const requestTimeoutTimer = setTimeout(() => resolve(null), 3000)
 
     page.route(path, (route, request) => {
       clearTimeout(requestTimeoutTimer)
@@ -14,6 +14,8 @@ exports.mockRequest = function (page, path) {
   })
 }
 
+exports.mockRequest = mockRequest
+
 exports.metaKey = function() {
   if (process.platform === 'darwin') {
     return 'Meta'
@@ -23,13 +25,13 @@ exports.metaKey = function() {
 }
 
 // Mocks a specified number of HTTP requests with given path. Returns a promise that resolves to a
-// list of requests as soon as the specified number of requests is made, or 10 seconds has passed.
+// list of requests as soon as the specified number of requests is made, or 3 seconds has passed.
-exports.mockManyRequests = function(page, path, numberOfRequests) {
+const mockManyRequests = function(page, path, numberOfRequests) {
   return new Promise((resolve, _reject) => {
     let requestList = []
-    const requestTimeoutTimer = setTimeout(() => resolve(requestList), 10000)
+    const requestTimeoutTimer = setTimeout(() => resolve(requestList), 3000)
 
-    page.route('/api/event', (route, request) => {
+    page.route(path, (route, request) => {
       requestList.push(request)
       if (requestList.length === numberOfRequests) {
         clearTimeout(requestTimeoutTimer)
@@ -40,6 +42,8 @@ exports.mockManyRequests = function(page, path, numberOfRequests) {
   })
 }
 
+exports.mockManyRequests = mockManyRequests
+
 exports.expectCustomEvent = function (request, eventName, eventProps) {
   const payload = request.postDataJSON()
 
@@ -49,3 +53,34 @@ exports.expectCustomEvent = function (request, eventName, eventProps) {
     expect(payload.p[key]).toEqual(value)
   }
 }
+
+exports.clickPageElementAndExpectEventRequests = async function (page, locatorToClick, expectedBodySubsets, refutedBodySubsets = []) {
+  const requestsToExpect = expectedBodySubsets.length
+  const requestsToAwait = requestsToExpect + refutedBodySubsets.length
+  
+  const plausibleRequestMockList = mockManyRequests(page, '/api/event', requestsToAwait)
+  await page.click(locatorToClick)
+  const requests = await plausibleRequestMockList
+
+  expect(requests.length).toBe(requestsToExpect)
+
+  expectedBodySubsets.forEach((bodySubset) => {
+    expect(requests.some((request) => {
+      return hasExpectedBodyParams(request, bodySubset)
+    })).toBe(true)
+  })
+
+  refutedBodySubsets.forEach((bodySubset) => {
+    expect(requests.every((request) => {
+      return !hasExpectedBodyParams(request, bodySubset)
+    })).toBe(true)
+  })
+}
+
+function hasExpectedBodyParams(request, expectedBodyParams) {
+  const body = request.postDataJSON()
+
+  return Object.keys(expectedBodyParams).every((key) => {
+    return body[key] === expectedBodyParams[key]
+  })
+}