refactor: Restructure source code folder

This way the location of certain classes should make more sense

test/unit/http/output/metadata/WwwAuthMetadataWriter.test.ts

@@ -0,0 +1,36 @@
+import { createResponse } from 'node-mocks-http';
+import { WwwAuthMetadataWriter } from '../../../../../src/http/output/metadata/WwwAuthMetadataWriter';
+import { RepresentationMetadata } from '../../../../../src/http/representation/RepresentationMetadata';
+import type { HttpResponse } from '../../../../../src/server/HttpResponse';
+import { HTTP } from '../../../../../src/util/Vocabularies';
+
+describe('A WwwAuthMetadataWriter', (): void => {
+  const auth = 'Bearer scope="openid webid"';
+  const writer = new WwwAuthMetadataWriter(auth);
+  let response: HttpResponse;
+
+  beforeEach(async(): Promise<void> => {
+    response = createResponse() as HttpResponse;
+  });
+
+  it('adds no header if there is no relevant metadata.', async(): Promise<void> => {
+    const metadata = new RepresentationMetadata();
+    await expect(writer.handle({ response, metadata })).resolves.toBeUndefined();
+    expect(response.getHeaders()).toEqual({ });
+  });
+
+  it('adds no header if the status code is not 401.', async(): Promise<void> => {
+    const metadata = new RepresentationMetadata({ [HTTP.statusCodeNumber]: '403' });
+    await expect(writer.handle({ response, metadata })).resolves.toBeUndefined();
+    expect(response.getHeaders()).toEqual({ });
+  });
+
+  it('adds a WWW-Authenticate header if the status code is 401.', async(): Promise<void> => {
+    const metadata = new RepresentationMetadata({ [HTTP.statusCodeNumber]: '401' });
+    await expect(writer.handle({ response, metadata })).resolves.toBeUndefined();
+
+    expect(response.getHeaders()).toEqual({
+      'www-authenticate': auth,
+    });
+  });
+});