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services/web/test/unit/src/Settings/SettingsTests.js

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+const chai = require('chai')
+const { expect } = chai
+
+function clearSettingsCache() {
+  const monorepoPath = require
+    .resolve('../../../../config/settings.defaults.js')
+    .replace(/\/services\/web\/config\/settings\.defaults\.js$/, '')
+  const settingsDeps = Object.keys(require.cache).filter(
+    x =>
+      x.includes('/@overleaf/settings') ||
+      x.includes(`${monorepoPath}/libraries/settings`) ||
+      x.includes(`${monorepoPath}/services/web/config`)
+  )
+  settingsDeps.forEach(dep => delete require.cache[dep])
+}
+
+/**
+ * @param {any} value
+ * @returns {string} A string representation of the structure of the value
+ */
+function serializeTypes(value) {
+  if (typeof value === 'object') {
+    const keys = Object.keys(value).sort()
+    const types = keys.reduce((acc, key) => {
+      acc[key] = serializeTypes(value[key])
+      return acc
+    }, {})
+    return JSON.stringify(types)
+  }
+  if (Array.isArray(value)) {
+    return JSON.stringify(value.map(serializeTypes))
+  }
+  return typeof value
+}
+
+/**
+ * @param {any[]} objects
+ * @returns {boolean} Whether all objects have the same structure
+ */
+function haveSameStructure(objects) {
+  if (!objects.length) return true
+  const referenceStructure = serializeTypes(objects[0])
+  return objects.every(obj => serializeTypes(obj) === referenceStructure)
+}
+
+describe('settings.defaults', function () {
+  it('additional text extensions can be added via config', function () {
+    clearSettingsCache()
+    process.env.ADDITIONAL_TEXT_EXTENSIONS = 'abc, xyz'
+    const settings = require('@overleaf/settings')
+    expect(settings.textExtensions).to.include('tex') // from the default list
+    expect(settings.textExtensions).to.include('abc')
+    expect(settings.textExtensions).to.include('xyz')
+  })
+
+  it('generates pricings with same structures', function () {
+    const settingsOverridesSaas = require('../../../../config/settings.overrides.saas.js')
+    const { localizedPlanPricing } = settingsOverridesSaas
+
+    const pricingCurrencies = Object.keys(localizedPlanPricing)
+    expect(pricingCurrencies.sort()).to.eql([
+      'AUD',
+      'BRL',
+      'CAD',
+      'CHF',
+      'CLP',
+      'COP',
+      'DKK',
+      'EUR',
+      'GBP',
+      'INR',
+      'MXN',
+      'NOK',
+      'NZD',
+      'PEN',
+      'SEK',
+      'SGD',
+      'USD',
+    ])
+
+    const pricings = pricingCurrencies.map(
+      currency => localizedPlanPricing[currency]
+    )
+    expect(haveSameStructure(pricings)).to.be.true
+  })
+})