Adds test for setting an accept-language header

src/__mocks__/axios.ts

@@ -1,5 +1,11 @@
 export default {
-  create: jest.fn(() => Promise.resolve({})),
+  create: jest.fn(() => ({
+    defaults: {
+      headers: {
+        common: {},
+      },
+    },
+  })),
   delete: jest.fn(() => Promise.resolve({ data: {} })),
   get: jest.fn(() => Promise.resolve({ data: {} })),
   patch: jest.fn(() => Promise.resolve({ data: {} })),

src/index.test.ts

@@ -76,3 +76,15 @@ it('can access the forms resource', async () => {
 
   expect(instance.forms()).toBeInstanceOf(Form.prototype.constructor);
 });
+
+it('can set an accepted language header', async () => {
+  const instance = new OpenApi('admin');
+
+  instance.locale('es');
+
+  const object = JSON.parse(JSON.stringify(instance));
+
+  expect(object.client.defaults.headers.common).toMatchObject({
+    'Accept-Language': 'es',
+  });
+});