feat(response-utils): Added helper-function to add headers to response

Author: Nicklas Utgaard

src/response-utils.ts

@@ -53,7 +53,7 @@ export default class ResponseUtils {
   }
 
   static jsonPromise(json: MockHandler): Promise<ResponseData> {
-    const response: ResponseData = { body: JSON.stringify(json) } as ResponseData;
+    const response: ResponseData = { body: JSON.stringify(json) };
     return Promise.resolve(response);
   }
 
@@ -67,14 +67,21 @@ export default class ResponseUtils {
 
   static statusCode(status: number): MockHandler {
     return (args: HandlerArgument) => {
-      const response: ResponseData = { status } as ResponseData;
+      const response: ResponseData = { status };
       return Promise.resolve(response);
     };
   }
 
   static statusText(statusText: string): MockHandler {
     return (args: HandlerArgument) => {
-      const response: ResponseData = { statusText } as ResponseData;
+      const response: ResponseData = { statusText };
+      return Promise.resolve(response);
+    };
+  }
+
+  static headers(headers: { [key: string]: string }): MockHandler {
+    return (args: HandlerArgument) => {
+      const response: ResponseData = { headers };
       return Promise.resolve(response);
     };
   }

test/yet-another-fetch-mock.test.ts

@@ -219,6 +219,21 @@ describe('FetchMock', () => {
     Promise.all([first, second]).then(() => done());
   });
 
+  it('should be able to set headers', done => {
+    mock.get(
+      '/withheaders',
+      ResponseUtils.combine(
+        ResponseUtils.json({ key: 'value' }),
+        ResponseUtils.headers({ 'Content-Type': 'custom/type' })
+      )
+    );
+
+    fetch('/withheaders').then(resp => {
+      expect(resp.headers.get('Content-Type')).toBe('custom/type');
+      done();
+    });
+  });
+
   it('should support lowercase httpverb', done => {
     mock.post('/lowercase', { key: 'BIG-CASE' });