Added an api test for content group fields

tests/System/integration/api/com_content/Field_Group.cy.js

@@ -0,0 +1,59 @@
+describe('Test that group field article API endpoint', () => {
+  afterEach(() => cy.task('queryDB', 'DELETE FROM #__fields_groups'));
+
+  it('can deliver a list of group fields', () => {
+    cy.db_createFieldGroup({ title: 'automated test field group', context: 'com_content.article' })
+      .then(() => cy.api_get('/fields/groups/content/articles'))
+      .then((response) => cy.wrap(response).its('body').its('data.0').its('attributes')
+        .its('title')
+        .should('include', 'automated test field group'));
+  });
+
+  it('can create a group field', () => {
+    cy.api_post('/fields/groups/content/articles', {
+      title: 'automated test group field',
+      access: 1,
+      context: 'com_content.article',
+      default_value: '',
+      description: '',
+      group_id: 0,
+      label: 'content group field',
+      language: '*',
+      name: 'content-group_field',
+      note: '',
+      params: {
+        class: '',
+        display: '2',
+        display_readonly: '2',
+        hint: '',
+        label_class: '',
+        label_render_class: '',
+        layout: '',
+        prefix: '',
+        render_class: '',
+        show_on: '',
+        showlabel: '1',
+        suffix: '',
+      },
+      required: 0,
+      state: 1,
+      type: 'text',
+    })
+      .then((response) => cy.wrap(response).its('body').its('data').its('attributes')
+        .its('title')
+        .should('include', 'automated test group field'));
+  });
+
+  it('can update a group field', () => {
+    cy.db_createFieldGroup({ title: 'automated test field group', access: 1, context: 'com_content.article' })
+      .then((id) => cy.api_patch(`/fields/groups/content/articles/${id}`, { title: 'updated automated test group field', context: 'com_content.article' }))
+      .then((response) => cy.wrap(response).its('body').its('data').its('attributes')
+        .its('title')
+        .should('include', 'updated automated test group field'));
+  });
+
+  it('can delete a group field', () => {
+    cy.db_createFieldGroup({ title: 'automated test group field', state: -2 })
+      .then((id) => cy.api_delete(`/fields/groups/content/articles/${id}`));
+  });
+});