feat: add request to fetch error and test spec

specs/error.spec.ts

@@ -1,5 +1,5 @@
 
-import { CommerceLayerClient } from '../src'
+import { CommerceLayerClient, ErrorObj } from '../src'
 import { ErrorType } from '../src/error'
 import { getClient } from '../test/common'
 
@@ -40,4 +40,23 @@ describe('SDK:error suite', () => {
 		}
 	})
 
+
+	it('ErrorInterceptor.error', async () => {
+
+		cl = await getClient({})
+
+		cl.addResponseInterceptor(undefined, (error: ErrorObj): ErrorObj => {
+			expect(error).toBeDefined()
+			expect(error.request).toBeDefined()
+			return error
+		})
+
+		try {
+			await cl.customers.create({ email: '' })
+		} catch (error) {
+			expect(error.type).toBe(ErrorType.RESPONSE)
+		}
+
+	})
+
 })

src/fetch.ts

@@ -26,12 +26,14 @@ export class FetchError extends Error {
   readonly #errors?: any[]
   readonly #status: number
   readonly #statusText: string
+  readonly #request?: Partial<FetchRequestOptions>
 
-  constructor(status: number, statusText: string, body?: any) {
+  constructor(status: number, statusText: string, body?: any, request?: FetchRequestOptions) {
     super(statusText)
     this.#status = status
     this.#statusText = statusText
     if (body) this.#errors = body.errors
+    if (request) this.#request = request
   }
 
 
@@ -41,6 +43,8 @@ export class FetchError extends Error {
 
   get statusText(): string { return this.#statusText }
 
+  get request(): Partial<FetchRequestOptions> | undefined { return this.#request }
+
 }
 
 
@@ -75,7 +79,7 @@ export const fetchURL = async (url: URL, requestOptions: FetchRequestOptions, cl
     : undefined
 
   if (!response.ok) {
-    let error = new FetchError(response.status, response.statusText, responseBody)
+    let error = new FetchError(response.status, response.statusText, responseBody, requestOptions)
     if (interceptors?.response?.onFailure) error = await interceptors.response.onFailure(error)
     if (error) throw error
   }