diff --git a/CHANGELOG.md b/CHANGELOG.md
index b93bdb8259..b42dc58b83 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@
 ## Unreleased
 
 * Rescope Brexit CTA to en/cy locale only ([PR #1984](https://github.com/alphagov/govuk_publishing_components/pull/1984))
+* Add js tests for accordion component ([PR #1977](https://github.com/alphagov/govuk_publishing_components/pull/1977))
 
 ## 24.6.1
 
diff --git a/spec/javascripts/components/accordion-spec.js b/spec/javascripts/components/accordion-spec.js
new file mode 100644
index 0000000000..33f0581fd7
--- /dev/null
+++ b/spec/javascripts/components/accordion-spec.js
@@ -0,0 +1,113 @@
+/* eslint-env jasmine, jquery */
+/* global GOVUK */
+
+describe('An accordion component', function () {
+  'use strict'
+
+  var element
+  var container
+
+  beforeEach(function () {
+    container = document.createElement('div')
+    container.innerHTML =
+      '<div class="gem-c-accordion govuk-!-margin-bottom-6" id="default-id" data-module="gem-accordion" data-anchor-navigation="true">' +
+        '<section class="gem-c-accordion__section">' +
+          '<div class="gem-c-accordion__section-header">' +
+            '<h2 class="gem-c-accordion__section-heading">' +
+              '<span id="default-id-heading-1" class="gem-c-accordion__section-button">Accordion 1</span>' +
+            '</h2>' +
+          '</div>' +
+          '<div id="default-id-content-1" class="gem-c-accordion__section-content" aria-label="Accordion 1">' +
+            '<p class="govuk-body">This is content for accordion 1 of 2</p>' +
+            '<p class="govuk-body">This content contains a <a href="#anchor-nav-test" class="govuk-link">link</a></p>' +
+          '</div>' +
+        '</section>' +
+        '<section class="gem-c-accordion__section">' +
+          '<div class="gem-c-accordion__section-header">' +
+            '<h2 class="gem-c-accordion__section-heading">' +
+              '<span id="default-id-heading-2" class="gem-c-accordion__section-button">Accordion 2</span>' +
+            '</h2>' +
+          '</div>' +
+          '<div id="default-id-content-2" class="gem-c-accordion__section-content" aria-label="Accordion 2">' +
+            '<p class="govuk-body" id="anchor-nav-test">This is content for accordion 2 of 2</p>' +
+          '</div>' +
+        '</section>' +
+      '</div>'
+
+    document.body.appendChild(container)
+    element = document.getElementById('default-id')
+    new GOVUK.Modules.GemAccordion().start($(element))
+  })
+
+  afterEach(function () {
+    document.body.removeChild(container)
+  })
+
+  describe('on page load', function () {
+    it('marks the accordion as active', function () {
+      expect(element).toHaveClass('gem-c-accordion--active')
+    })
+
+    it('loads the accordion show/all/hide all controls', function () {
+      var controls = element.querySelector('.gem-c-accordion__controls')
+
+      expect(controls).toBeTruthy()
+      expect(controls.innerText).toEqual('Show all sections')
+    })
+
+    it('marks up the accordion titles as buttons with show/hide controls', function () {
+      var header = element.querySelector('.gem-c-accordion__section-header')
+      var headerControl = header.querySelector('.gem-c-accordion__toggle-text')
+
+      expect(headerControl).toBeTruthy()
+      expect(headerControl.innerText).toEqual('Show')
+    })
+  })
+
+  describe('when opening and closing accordions', function () {
+    it('opens and closes an accordion', function () {
+      var section = element.querySelector('.gem-c-accordion__section')
+      var header = section.querySelector('.gem-c-accordion__section-header')
+      var headerControl = header.querySelector('.gem-c-accordion__toggle-text')
+
+      header.click()
+      expect(section).toHaveClass('gem-c-accordion__section--expanded')
+      expect(headerControl.innerText).toEqual('Hide')
+
+      header.click()
+      expect(section).not.toHaveClass('gem-c-accordion__section--expanded')
+      expect(headerControl.innerText).toEqual('Show')
+    })
+
+    it('opens and closes all accordions when the show/hide all controls are used', function () {
+      var topLevelControl = element.querySelector('.gem-c-accordion__open-all')
+
+      topLevelControl.click()
+      expect(topLevelControl.innerText).toEqual('Hide all sections')
+
+      element.querySelectorAll('.gem-c-accordion__section').forEach(function (section, i) {
+        expect(section).toHaveClass('gem-c-accordion__section--expanded')
+        expect(section.querySelector('.gem-c-accordion__toggle-text').innerText).toEqual('Hide')
+      })
+
+      topLevelControl.click()
+      expect(topLevelControl.innerText).toEqual('Show all sections')
+
+      element.querySelectorAll('.gem-c-accordion__section').forEach(function (section, i) {
+        expect(section).not.toHaveClass('gem-c-accordion__section--expanded')
+        expect(section.querySelector('.gem-c-accordion__toggle-text').innerText).toEqual('Show')
+      })
+    })
+  })
+
+  describe('when using the anchor navigation feature flag', function () {
+    // For this test, we base the function on the markup snapshot above.
+    // The anchor link is in the first accordion whilst the anchor is in the second accordion
+    it('opens an accordion based on anchors within that accordion when the associated anchor link is clicked', function () {
+      var link = element.querySelector('.gem-c-accordion__section').querySelector('.govuk-link')
+
+      link.click()
+      expect(element.querySelectorAll('.gem-c-accordion__section')[1]).toHaveClass('gem-c-accordion__section--expanded')
+    })
+  })
+})