feat: add support for HEAD requests (#130)

.changeset/happy-mails-heal.md

@@ -0,0 +1,5 @@
+---
+'@labdigital/commercetools-mock': minor
+---
+
+Add support for HEAD requests

src/ctMock.ts

@@ -193,6 +193,37 @@ export class CommercetoolsMock {
 					headers: mapHeaderType(res.headers),
 				})
 			}),
+			http.head(`${this.options.apiHost}/*`, async ({ request }) => {
+				const body = await request.text()
+				const url = new URL(request.url)
+				const headers = copyHeaders(request.headers)
+
+				const res = await inject(server)
+					.get(url.pathname + '?' + url.searchParams.toString())
+					.body(body)
+					.headers(headers)
+					.end()
+
+				if (res.statusCode === 200) {
+					const parsedBody = JSON.parse(res.body)
+					// Check if we have a count property (e.g. for query-lookups)
+					// or if we have a result object (e.g. for single lookups)
+					const resultCount =
+						'count' in parsedBody
+							? parsedBody.count
+							: Object.keys(parsedBody).length
+
+					return new HttpResponse(null, {
+						status: resultCount > 0 ? 200 : 404,
+						headers: mapHeaderType(res.headers),
+					})
+				}
+
+				return new HttpResponse(null, {
+					status: res.statusCode,
+					headers: mapHeaderType(res.headers),
+				})
+			}),
 			http.get(`${this.options.apiHost}/*`, async ({ request }) => {
 				const body = await request.text()
 				const url = new URL(request.url)

src/services/custom-object.test.ts

@@ -47,7 +47,23 @@ describe('CustomObject retrieve', () => {
 		ctMock.clear()
 	})
 
-	test('createget', async () => {
+	test('exists', async () => {
+		const response = await supertest(ctMock.app)
+			.head('/dummy/custom-objects/my-container/my-key')
+			.send()
+
+		expect(response.status).toBe(200)
+	})
+
+	test('non-existent', async () => {
+		const response = await supertest(ctMock.app)
+			.head('/dummy/custom-objects/invalid-container/invalid')
+			.send()
+
+		expect(response.status).toBe(404)
+	})
+
+	test('get', async () => {
 		const response = await supertest(ctMock.app)
 			.get('/dummy/custom-objects/my-container/my-key')
 			.send()

src/services/customer.test.ts

@@ -26,6 +26,26 @@ describe('Customer Update Actions', () => {
 		ctMock.clear()
 	})
 
+	test('exists', async () => {
+		assert(customer, 'customer not created')
+
+		const response = await supertest(ctMock.app)
+			.head(`/dummy/customers/${customer.id}`)
+			.send()
+
+		expect(response.status).toBe(200)
+	})
+
+	test('non-existent', async () => {
+		assert(customer, 'customer not created')
+
+		const response = await supertest(ctMock.app)
+			.head(`/dummy/customers/invalid-id`)
+			.send()
+
+		expect(response.status).toBe(404)
+	})
+
 	test('changeEmail', async () => {
 		assert(customer, 'customer not created')