refactor: Restructure source code folder

This way the location of certain classes should make more sense

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

@@ -0,0 +1,54 @@
+import { createResponse } from 'node-mocks-http';
+import { WacAllowMetadataWriter } from '../../../../../src/http/output/metadata/WacAllowMetadataWriter';
+import { RepresentationMetadata } from '../../../../../src/http/representation/RepresentationMetadata';
+import type { HttpResponse } from '../../../../../src/server/HttpResponse';
+import { ACL, AUTH } from '../../../../../src/util/Vocabularies';
+
+describe('A WacAllowMetadataWriter', (): void => {
+  const writer = new WacAllowMetadataWriter();
+  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 a WAC-Allow header if there is relevant metadata.', async(): Promise<void> => {
+    const metadata = new RepresentationMetadata({
+      [AUTH.userMode]: [ ACL.terms.Read, ACL.terms.Write ],
+      [AUTH.publicMode]: [ ACL.terms.Read ],
+    });
+    await expect(writer.handle({ response, metadata })).resolves.toBeUndefined();
+
+    expect(response.getHeaders()).toEqual({
+      'wac-allow': 'user="read write",public="read"',
+    });
+  });
+
+  it('only adds a header value for entries with at least 1 permission.', async(): Promise<void> => {
+    const metadata = new RepresentationMetadata({
+      [AUTH.userMode]: [ ACL.terms.Read, ACL.terms.Write ],
+    });
+    await expect(writer.handle({ response, metadata })).resolves.toBeUndefined();
+
+    expect(response.getHeaders()).toEqual({
+      'wac-allow': 'user="read write"',
+    });
+  });
+
+  it('applies public modes to user modes.', async(): Promise<void> => {
+    const metadata = new RepresentationMetadata({
+      [AUTH.publicMode]: [ ACL.terms.Read, ACL.terms.Write ],
+    });
+    await expect(writer.handle({ response, metadata })).resolves.toBeUndefined();
+
+    expect(response.getHeaders()).toEqual({
+      'wac-allow': 'user="read write",public="read write"',
+    });
+  });
+});