diff --git a/tests/javascripts/fullscreenTable.test.js b/tests/javascripts/fullscreenTable.test.js
new file mode 100644
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+++ b/tests/javascripts/fullscreenTable.test.js
@@ -0,0 +1,370 @@
+const helpers = require('./support/helpers');
+
+beforeAll(() => {
+  // set up jQuery
+  window.jQuery = require('jquery');
+  $ = window.jQuery;
+
+  // load module code
+  require('govuk_frontend_toolkit/javascripts/govuk/modules.js');
+  require('../../app/assets/javascripts/fullscreenTable.js');
+});
+
+afterAll(() => {
+  window.jQuery = null;
+  $ = null;
+
+  delete window.GOVUK;
+});
+
+describe('FullscreenTable', () => {
+  let container;
+  let tableFrame;
+  let table;
+  let numberColumnFrame;
+
+  function setWindowHeightTo (height) {
+
+    // mock DOM calls for window height
+    window.innerHeight = height;
+    // remove calls to document.documentElement.clientHeight  when jQuery is gone. It's called to support older browsers like IE8
+    jest.spyOn(document.documentElement, 'clientHeight', 'get').mockImplementation(() => height);
+
+  };
+
+  function setWindowWidthTo (width) {
+
+    // mock DOM calls for window width
+    window.innerWidth = width;
+    // remove calls to document.documentElement.clientWidth  when jQuery is gone. It's called to support older browsers like IE8
+    jest.spyOn(document.documentElement, 'clientWidth', 'get').mockImplementation(() => height);
+
+  };
+
+  function resizeWindowTo (dimensions) {
+
+    setWindowHeightTo(dimensions.height);
+    setWindowWidthTo(dimensions.width);
+    helpers.triggerEvent(window, 'resize');
+
+  };
+
+  function scrollWindowBy (scrollTop) {
+
+      document.documentElement.scrollTop = scrollTop;
+      helpers.triggerEvent(window, 'scroll');
+
+  };
+
+  function resetWindowDimensions () {
+
+    setWindowHeightTo(768);
+    setWindowWidthTo(1024);
+
+  };
+
+  function setElementDimensionsAndOffset (el, opts) {
+
+    const elOffsetSpy = jest.spyOn(el, 'getBoundingClientRect');
+
+    if (opts.height) {
+      el.setAttribute('style', `height: ${opts.height}px`);
+    }
+
+    if (opts.width) {
+      el.setAttribute('style', `width: ${opts.width}px`);
+    }
+
+    if (opts.offset) {
+      elOffsetSpy.mockImplementation(() => opts.offset);
+    }
+
+  };
+
+  function setElementWidth (el, width) {
+
+    el.setAttribute('style', `.width: ${width}px`);
+
+  };
+
+  beforeEach(() => {
+
+    const tableHeadings = () => {
+      let result = '';
+      const headings = ['1', 'name', 'email address', 'age', 'building number', 'address line 1', 'address line 2', 'postcode'];
+
+      headings.forEach((heading, idx) => {
+        if (idx === 0) {
+          result += `<th scope="col" class="table-field-heading-first">
+                        <span class="visually-hidden">Row in file</span><span aria-hidden="true" class="table-field-invisible-error">${heading}</span>
+                      </th>`;
+        } else {
+          result += `<th scope="col" class="table-field-heading">
+                      ${heading}
+                      </th>`;
+        }
+      });
+
+      return result;
+    }
+
+    const rowCells = (cells) => {
+      let result = '';
+
+      Object.keys(cells).forEach((key, idx) => {
+        if (idx === 0) {
+          result += `<td class="table-field-index">
+                      <span class="table-field-error">
+                        ${key}
+                      </span>
+                    </td>`;
+        } else {
+          result += `<td class="table-field-left-aligned ">
+                      <div class="table-field-status-default">
+                        ${key}
+                      </div>
+                    </td>`;
+        }
+      });
+
+      return result;
+    };
+
+    const tableRows = () => {
+      let result = '';
+
+      const rows = [
+        ['John Logie Baird', 'johnlbaird@gmail.com', '37', '22', 'Frith Street', 'Soho, London', 'W1D 4RF'],
+        ['Guglielmo Marconi', 'gmarconi@hotmail.com', '21', 'Pontecchio Marconi', 'Via Celestini 1', 'Bologna', ''],
+        ['Louis Braille', 'louisbraille@yahoo.co.uk', '', '56', 'Boulevard des Invalides', 'Paris', '75007'],
+        ['Ray Tomlinson', 'hedy.lamarr@msn.com', '25', '870', '870 Winter Street', 'Waltham', 'MA 02451']
+      ];
+
+      rows.forEach(row => {
+        result += `<tr class="table-row">${rowCells(row)}</tr>`;
+      });
+
+      return result;
+
+    }
+
+    // set up DOM
+    document.body.innerHTML =
+      `<main>
+        <div class="fullscreen-content" data-module="fullscreen-table">
+          <table class="table table-font-xsmall">
+            <caption class="heading-medium table-heading visuallyhidden">
+              people.csv
+            </caption>
+            <thead class="table-field-headings-visible">
+              <tr>
+                ${tableHeadings()}
+              </tr>
+            </thead>
+            <tbody>
+              ${tableRows()}
+            </tbody>
+          </table>
+        </div>
+       </main>`;
+
+    container = document.querySelector('.fullscreen-content');
+
+  });
+
+  afterEach(() => {
+
+    document.body.innerHTML = '';
+
+  });
+
+  describe("when it loads", () => {
+
+    beforeEach(() => {
+
+      // start module
+      window.GOVUK.modules.start();
+
+    });
+
+    test("it fixes the number column for each row without changing the semantics", () => {
+
+      tableFrame = document.querySelector('.fullscreen-scrollable-table');
+      numberColumnFrame = document.querySelector('.fullscreen-fixed-table');
+
+      expect(tableFrame).not.toBeNull();
+      expect(numberColumnFrame).not.toBeNull();
+      expect(numberColumnFrame.getAttribute('role')).toEqual('presentation');
+
+    });
+
+  });
+
+  describe("the height of the table should fit the vertical space available to it", () => {
+
+    beforeEach(() => {
+
+      // set the height and offset of the window and table container from the top of the document
+      // so just the top 268px of it appears on-screen
+      setWindowHeightTo(768);
+      setElementDimensionsAndOffset(container, { height: 1000, offset: { top: 500 } });
+
+      // start module
+      window.GOVUK.modules.start();
+
+      tableFrame = document.querySelector('.fullscreen-scrollable-table');
+      numberColumnFrame = document.querySelector('.fullscreen-fixed-table');
+
+    });
+
+    afterEach(() => {
+
+      jest.clearAllMocks();
+      resetWindowDimensions();
+      scrollWindowBy(0);
+
+    });
+
+    test("when the page has loaded", () => {
+
+      // the frames should crop to the top 268px of the table that is visible
+      expect(window.getComputedStyle(tableFrame)['height']).toEqual('268px');
+      expect(window.getComputedStyle(numberColumnFrame)['height']).toEqual('268px');
+
+    });
+
+    test("when the page has scrolled", () => {
+
+      // scroll the window so the table fills the height of the window (768px)
+      scrollWindowBy(500);
+
+      // the frames should crop to the window height
+      expect(window.getComputedStyle(tableFrame)['height']).toEqual('768px');
+      expect(window.getComputedStyle(numberColumnFrame)['height']).toEqual('768px');
+
+    });
+
+    test("when the page has resized", () => {
+
+      // resize the window by 232px (from 768px to 1000px)
+      resizeWindowTo({ height: 1000, width: 1024 });
+
+      // the frames should crop to the top 500px of the table now visible
+      expect(window.getComputedStyle(tableFrame)['height']).toEqual('500px');
+      expect(window.getComputedStyle(numberColumnFrame)['height']).toEqual('500px');
+
+    });
+
+  });
+
+  describe("the width of the table should fit the horizontal space available to it", () => {
+    let rowNumberColumnCell;
+
+    beforeEach(() => {
+
+      rowNumberColumnCell = container.querySelector('.table-field-index');
+
+      // set main content column width (used as module as gauge for table width)
+      setWindowWidthTo(1024);
+      document.querySelector('main').setAttribute('style', 'width: 742px');
+
+      // set total width of column for row numbers in table to 40px
+      rowNumberColumnCell.setAttribute('style', 'width: 40px');
+
+      // start module
+      window.GOVUK.modules.start();
+
+      tableFrame = document.querySelector('.fullscreen-scrollable-table');
+      numberColumnFrame = document.querySelector('.fullscreen-fixed-table');
+
+    });
+
+    afterEach(() => {
+
+      jest.clearAllMocks();
+      resetWindowDimensions();
+      scrollWindowBy(0);
+
+    });
+
+    test("when the page has loaded", () => {
+
+      // table should set its width to be that of `<main>`, minus margin-left for the row numbers column
+      expect(window.getComputedStyle(tableFrame)['width']).toEqual('702px'); // width of content column - numbers column
+      expect(window.getComputedStyle(tableFrame)['margin-left']).toEqual('40px'); // width of numbers column
+
+      // table for number column has 4px extra to allow space for drop shadow
+      expect(window.getComputedStyle(numberColumnFrame)['width']).toEqual('44px');
+
+    });
+
+    test("when the page has resized", () => {
+
+      // resize window and content column
+      document.querySelector('main').setAttribute('style', 'width: 720px');
+      resizeWindowTo({ height: 768, width: 960 });
+
+      // table should set its width to be that of `<main>`, minus margin-left for the row numbers column
+      expect(window.getComputedStyle(tableFrame)['width']).toEqual('680px'); // width of content column - numbers column
+      expect(window.getComputedStyle(tableFrame)['margin-left']).toEqual('40px'); // width of numbers column
+
+      // table for number column has 4px extra to allow space for drop shadow
+      expect(window.getComputedStyle(numberColumnFrame)['width']).toEqual('44px');
+
+    });
+
+  });
+
+  describe("when the table scrolls horizontally", () => {
+    let rightEdgeShadow;
+
+    beforeEach(() => {
+
+      // start module
+      window.GOVUK.modules.start();
+
+      tableFrame = document.querySelector('.fullscreen-scrollable-table');
+      table = tableFrame.querySelector('table');
+      numberColumnFrame = document.querySelector('.fullscreen-fixed-table');
+      rightEdgeShadow = container.querySelector('.fullscreen-right-shadow');
+
+      tableFrame.setAttribute('style', 'width: 742px');
+      table.setAttribute('style', 'width: 1000px');
+
+    });
+
+    test("the right edge of the table scroll area should have a drop-shadow if it isn't scrolled", () => {
+
+      tableFrame.scrollLeft = 0;
+      helpers.triggerEvent(tableFrame, 'scroll');
+
+      expect(numberColumnFrame.classList.contains('fullscreen-scrolled-table')).toBe(false);
+      expect(rightEdgeShadow.classList.contains('visible')).toBe(true);
+
+    });
+
+    test("the left edge of the table scroll area should have a drop-shadow if the table is scrolled to 100%", () => {
+
+      // scroll to end of table
+      tableFrame.scrollLeft = 258;
+      helpers.triggerEvent(tableFrame, 'scroll');
+
+      expect(numberColumnFrame.classList.contains('fullscreen-scrolled-table')).toBe(true);
+      expect(rightEdgeShadow.classList.contains('visible')).toBe(false);
+
+    });
+
+    test("both edges of the table scroll area should have a drop-shadow if the table is scrolled between 0% and 100%", () => {
+
+      // scroll to middle of table
+      tableFrame.scrollLeft = 129;
+      helpers.triggerEvent(tableFrame, 'scroll');
+
+      expect(numberColumnFrame.classList.contains('fullscreen-scrolled-table')).toBe(true);
+      expect(rightEdgeShadow.classList.contains('visible')).toBe(true);
+
+    });
+
+  });
+
+});