Add test and fix for no options API (Azure#15455)

Author: Yoseph Maguire

sdk/iot/iot-modelsrepository/src/fetcherHTTP.ts

@@ -30,8 +30,11 @@ export class HttpFetcher implements Fetcher {
     this._baseURL = baseURL;
   }
 
-  async fetch(path: string, options: OperationOptions): Promise<DTDL | DTDL[]> {
+  async fetch(path: string, options?: OperationOptions): Promise<DTDL | DTDL[]> {
     logger.info(`Fetching ${path} from remote endpoint`);
+    if (!options) {
+      options = {};
+    }
     const myURL = this._baseURL + "/" + path;
     const requestMethod: HttpMethods = "GET";
     const requestHeader: HttpHeaders = createHttpHeaders(options.requestOptions?.customHeaders);

sdk/iot/iot-modelsrepository/test/node/integration/index.spec.ts

@@ -27,6 +27,29 @@ interface RemoteResolutionScenario {
 }
 
 const remoteResolutionScenarios: RemoteResolutionScenario[] = [
+  {
+    name: "dependencyResolution: disabled, single DTMI, no options",
+    clientOptions: {
+      dependencyResolution: "disabled",
+      repositoryLocation: "https://www.devicemodels.contoso.com"
+    },
+    getModelsOptions: undefined,
+    dtmis: [
+      {
+        dtmi: "dtmi:contoso:FakeDeviceManagement:DeviceInformation;1",
+        expectedUri:
+          "https://www.devicemodels.contoso.com/dtmi/contoso/fakedevicemanagement/deviceinformation-1.json",
+        mockedResponse: {
+          "@id": "dtmi:contoso:FakeDeviceManagement:DeviceInformation;1",
+          fakeDtdl: "fakeBodyAsText"
+        },
+        expectedOutputJson: {
+          "@id": "dtmi:contoso:FakeDeviceManagement:DeviceInformation;1",
+          fakeDtdl: "fakeBodyAsText"
+        }
+      }
+    ]
+  },
   {
     name: "dependencyResolution: disabled, single DTMI, no dependencies",
     clientOptions: {