diff --git a/src/acronym/index.spec.jsx b/src/acronym/index.spec.jsx
index 062a3bd..a8d4d05 100644
--- a/src/acronym/index.spec.jsx
+++ b/src/acronym/index.spec.jsx
@@ -3,11 +3,35 @@ import { render } from 'enzyme';
 import Acronym from './';
 import dictionary from '@ukhomeoffice/asl-dictionary';
 
-describe('<Acronym />', () => {
-  Object.keys(dictionary).forEach(key => {
+describe('Acronym component', () => {
+  Object.entries(dictionary)
+      .filter(([,definition]) => typeof definition === "string")
+      .forEach(([key, definition]) => {
     test(`handles input ${key}`, () => {
       const wrapper = render(<Acronym>{key}</Acronym>);
-      expect(wrapper.attr('title')).toBe(dictionary[key]);
+      expect(wrapper.attr('title')).toBe(definition);
+      expect(wrapper.text()).toBe(key);
+      expect(wrapper.get(0).tagName).toBe('abbr');
+    });
+  });
+
+  Object.entries(dictionary.plural)
+      .filter(([,definition]) => typeof definition === "string")
+      .forEach(([key, definition]) => {
+    test(`handles input ${key} and outputs a plural definition`, () => {
+      const wrapper = render(<Acronym usePlural>{key}</Acronym>);
+      expect(wrapper.attr('title')).toBe(definition);
+      expect(wrapper.text()).toBe(key);
+      expect(wrapper.get(0).tagName).toBe('abbr');
+    });
+  });
+
+  Object.entries(dictionary)
+      .filter(([key,definition]) => typeof definition === "string" && dictionary.plural[key] === undefined)
+      .forEach(([key, definition]) => {
+    test(`handles input ${key} and fallsback to singular when no plural defined`, () => {
+      const wrapper = render(<Acronym usePlural>{key}</Acronym>);
+      expect(wrapper.attr('title')).toBe(definition);
       expect(wrapper.text()).toBe(key);
       expect(wrapper.get(0).tagName).toBe('abbr');
     });