feat: Handle OPTIONS requests in OperationHandler

test/unit/http/ldp/OptionsOperationHandler.test.ts

@@ -0,0 +1,44 @@
+import { OptionsOperationHandler } from '../../../../src/http/ldp/OptionsOperationHandler';
+import type { Operation } from '../../../../src/http/Operation';
+import { BasicRepresentation } from '../../../../src/http/representation/BasicRepresentation';
+import { BasicConditions } from '../../../../src/storage/BasicConditions';
+import type { ResourceSet } from '../../../../src/storage/ResourceSet';
+import { NotFoundHttpError } from '../../../../src/util/errors/NotFoundHttpError';
+import { NotImplementedHttpError } from '../../../../src/util/errors/NotImplementedHttpError';
+
+describe('An OptionsOperationHandler', (): void => {
+  let operation: Operation;
+  const conditions = new BasicConditions({});
+  const preferences = {};
+  const body = new BasicRepresentation();
+  let resourceSet: jest.Mocked<ResourceSet>;
+  let handler: OptionsOperationHandler;
+
+  beforeEach(async(): Promise<void> => {
+    operation = { method: 'OPTIONS', target: { path: 'http://test.com/foo' }, preferences, conditions, body };
+    resourceSet = {
+      hasResource: jest.fn().mockResolvedValue(true),
+    };
+    handler = new OptionsOperationHandler(resourceSet);
+  });
+
+  it('only supports Options operations.', async(): Promise<void> => {
+    await expect(handler.canHandle({ operation })).resolves.toBeUndefined();
+    operation.method = 'GET';
+    await expect(handler.canHandle({ operation })).rejects.toThrow(NotImplementedHttpError);
+    operation.method = 'HEAD';
+    await expect(handler.canHandle({ operation })).rejects.toThrow(NotImplementedHttpError);
+  });
+
+  it('returns a 204 response.', async(): Promise<void> => {
+    const result = await handler.handle({ operation });
+    expect(result.statusCode).toBe(204);
+    expect(result.metadata).toBeUndefined();
+    expect(result.data).toBeUndefined();
+  });
+
+  it('returns a 404 if the target resource does not exist.', async(): Promise<void> => {
+    resourceSet.hasResource.mockResolvedValueOnce(false);
+    await expect(handler.handle({ operation })).rejects.toThrow(NotFoundHttpError);
+  });
+});