Added more unit tests to increase code coverage

tests/javascripts/preventDuplicateFormSubmissions.test.js

@@ -65,5 +65,140 @@ describe('Prevent duplicate form submissions', () => {
 
   });
 
+  test("It should not error when form has no submit button", () => {
+
+    document.body.innerHTML = `
+      <form action="/" method="post">
+        <input type="text" name="test">
+      </form>`;
+
+    form = document.querySelector('form');
+    formEventSpy = helpers.spyOnFormSubmitEventPrevention(jest, form);
+
+    jest.resetModules();
+    require('../../app/assets/javascripts/preventDuplicateFormSubmissions.js');
+
+    expect(() => {
+      helpers.triggerEvent(form, 'submit');
+    }).not.toThrow();
+
+  });
+
+  test("It should disable and add spinner to 'send' button", () => {
+
+    document.body.innerHTML = `
+      <form action="/" method="post">
+        <button class="usa-button" type="submit" name="send">Send</button>
+      </form>`;
+
+    form = document.querySelector('form');
+    button = document.querySelector('button');
+    formEventSpy = helpers.spyOnFormSubmitEventPrevention(jest, form);
+
+    jest.resetModules();
+    require('../../app/assets/javascripts/preventDuplicateFormSubmissions.js');
+
+    helpers.triggerEvent(button, 'click');
+
+    jest.advanceTimersByTime(100);
+
+    expect(button.disabled).toBe(true);
+    expect(button.getAttribute('aria-busy')).toBe('true');
+    expect(button.querySelector('.loading-spinner')).not.toBeNull();
+
+  });
+
+  test("It should disable and add spinner to 'schedule' button", () => {
+
+    document.body.innerHTML = `
+      <form action="/" method="post">
+        <button class="usa-button" type="submit" name="schedule">Schedule</button>
+      </form>`;
+
+    form = document.querySelector('form');
+    button = document.querySelector('button');
+    formEventSpy = helpers.spyOnFormSubmitEventPrevention(jest, form);
+
+    jest.resetModules();
+    require('../../app/assets/javascripts/preventDuplicateFormSubmissions.js');
+
+    helpers.triggerEvent(button, 'click');
+
+    jest.advanceTimersByTime(100);
+
+    expect(button.disabled).toBe(true);
+    expect(button.getAttribute('aria-busy')).toBe('true');
+    expect(button.querySelector('.loading-spinner')).not.toBeNull();
+
+  });
+
+  test("It should disable both send and cancel buttons when send is clicked", () => {
+
+    document.body.innerHTML = `
+      <form action="/" method="post">
+        <button class="usa-button" type="submit" name="send">Send</button>
+        <button class="usa-button" type="submit" name="cancel">Cancel</button>
+      </form>`;
+
+    form = document.querySelector('form');
+    const sendButton = document.querySelector('button[name="send"]');
+    const cancelButton = document.querySelector('button[name="cancel"]');
+    formEventSpy = helpers.spyOnFormSubmitEventPrevention(jest, form);
+
+    jest.resetModules();
+    require('../../app/assets/javascripts/preventDuplicateFormSubmissions.js');
+
+    helpers.triggerEvent(sendButton, 'click');
+
+    jest.advanceTimersByTime(100);
+
+    expect(sendButton.disabled).toBe(true);
+    expect(cancelButton.disabled).toBe(true);
+
+  });
+
+  test("It should not add duplicate spinner if one already exists", () => {
+
+    document.body.innerHTML = `
+      <form action="/" method="post">
+        <button class="usa-button" type="submit" name="send">Send<span class="loading-spinner"></span></button>
+      </form>`;
+
+    form = document.querySelector('form');
+    button = document.querySelector('button');
+    formEventSpy = helpers.spyOnFormSubmitEventPrevention(jest, form);
+
+    jest.resetModules();
+    require('../../app/assets/javascripts/preventDuplicateFormSubmissions.js');
+
+    helpers.triggerEvent(button, 'click');
+
+    jest.advanceTimersByTime(100);
+
+    expect(button.querySelectorAll('.loading-spinner').length).toBe(1);
+
+  });
+
+  test("It should handle button with no name attribute", () => {
+
+    document.body.innerHTML = `
+      <form action="/" method="post">
+        <button class="usa-button" type="submit">Submit</button>
+      </form>`;
+
+    form = document.querySelector('form');
+    button = document.querySelector('button');
+    formEventSpy = helpers.spyOnFormSubmitEventPrevention(jest, form);
+
+    jest.resetModules();
+    require('../../app/assets/javascripts/preventDuplicateFormSubmissions.js');
+
+    expect(() => {
+      helpers.triggerEvent(button, 'click');
+      jest.advanceTimersByTime(1600);
+    }).not.toThrow();
+
+  });
+
 
 });