change: Make credential extractors specialized.

test/unit/authentication/EmptyCredentialsExtractor.test.ts

@@ -0,0 +1,20 @@
+import { EmptyCredentialsExtractor } from '../../../src/authentication/EmptyCredentialsExtractor';
+import type { HttpRequest } from '../../../src/server/HttpRequest';
+import { NotImplementedHttpError } from '../../../src/util/errors/NotImplementedHttpError';
+
+describe('An EmptyCredentialsExtractor', (): void => {
+  const extractor = new EmptyCredentialsExtractor();
+
+  it('throws an error if an Authorization header is specified.', async(): Promise<void> => {
+    const headers = { authorization: 'Other http://alice.example/card#me' };
+    const result = extractor.handleSafe({ headers } as HttpRequest);
+    await expect(result).rejects.toThrow(NotImplementedHttpError);
+    await expect(result).rejects.toThrow('Unexpected Authorization scheme.');
+  });
+
+  it('returns the empty credentials.', async(): Promise<void> => {
+    const headers = {};
+    const result = extractor.handleSafe({ headers } as HttpRequest);
+    await expect(result).resolves.toEqual({});
+  });
+});