feat(rest): allow to set request header

src/REST.spec.ts

@@ -10,6 +10,8 @@ const __dirname = fileURLToPath(new URL('.', import.meta.url))
 void describe('REST', () => {
 	void it('should implement a REST client', async () => {
 		const scope = nock(`https://api.example.com`)
+
+		scope
 			.get('/foo', undefined, {
 				reqheaders: {
 					Accept: 'application/json',
@@ -27,6 +29,24 @@ void describe('REST', () => {
 				},
 			)
 
+		scope
+			.post('/bar', undefined, {
+				reqheaders: {
+					Authorization: 'Bearer BAR',
+				},
+			})
+			.reply(
+				200,
+				{
+					'@context':
+						'https://github.com/hello-nrfcloud/bdd-markdown-steps/tests',
+					success: true,
+				},
+				{
+					'content-type': 'application/json; charset=utf-8',
+				},
+			)
+
 		const runner = await runFolder({
 			folder: path.join(__dirname, 'test-data', 'REST'),
 			name: 'REST',

src/REST.ts

@@ -13,6 +13,8 @@ let currentRequest: ReturnType<typeof doRequest> = {
 	match: async () => Promise.reject(new Error(`No request pending!`)),
 }
 
+let nextRequestHeaders: Headers = new Headers()
+
 export const steps: StepRunner<Record<string, any>>[] = [
 	regExpMatchedStep(
 		{
@@ -34,14 +36,18 @@ export const steps: StepRunner<Record<string, any>>[] = [
 		async ({ match: { method, endpoint, withPayload, retry }, log, step }) => {
 			const url = new URL(endpoint)
 
-			const headers: HeadersInit = {
+			const headers: Headers = new Headers({
 				Accept: 'application/json',
+			})
+			for (const [key, value] of nextRequestHeaders.entries()) {
+				headers.set(key, value)
 			}
+			nextRequestHeaders = new Headers()
 
 			let bodyAsString: string | undefined = undefined
 			if (withPayload !== undefined) {
 				bodyAsString = JSON.stringify(JSON.parse(codeBlockOrThrow(step).code))
-				headers['Content-type'] = 'application/json'
+				headers.set('content-type', 'application/json')
 			}
 
 			currentRequest = doRequest(
@@ -59,6 +65,20 @@ export const steps: StepRunner<Record<string, any>>[] = [
 			)
 		},
 	),
+	regExpMatchedStep(
+		{
+			regExp:
+				/^the `(?<header>[^`]+)` header of the next request is `(?<value>[^`]+)`$/,
+			schema: Type.Object({
+				header: Type.String({ minLength: 1 }),
+				value: Type.String({ minLength: 1 }),
+			}),
+		},
+		async ({ match: { header, value }, log: { debug } }) => {
+			debug(header, value)
+			nextRequestHeaders.set(header, value)
+		},
+	),
 	regExpMatchedStep(
 		{
 			regExp: /^I should receive a `(?<context>https?:\/\/[^`]+)` response$/,

src/test-data/REST/REST.feature.md

@@ -13,3 +13,14 @@ Then I should receive a
 `https://github.com/hello-nrfcloud/bdd-markdown-steps/tests` response
 
 And the status code of the last response should be `200`
+
+## Setting headers
+
+Given the `Authorization` header of the next request is `Bearer BAR`
+
+When I `POST` to `${endpoint}/bar`
+
+Then I should receive a
+`https://github.com/hello-nrfcloud/bdd-markdown-steps/tests` response
+
+And the status code of the last response should be `200`