chore: Remove assumption that DataAccessors have a root container by default

test/configs/Util.ts

@@ -1,6 +1,8 @@
+import type { Server } from 'http';
 import { join } from 'path';
 import * as Path from 'path';
 import { Loader } from 'componentsjs';
+import fetch from 'cross-fetch';
 import type {
   BodyParser,
   DataAccessor,
@@ -24,6 +26,7 @@ import {
   ErrorResponseWriter,
   GetOperationHandler,
   HeadOperationHandler,
+  HttpError,
   InMemoryDataAccessor,
   LinkRelMetadataWriter,
   LinkTypeParser,
@@ -192,3 +195,21 @@ export const instantiateFromConfig = async(componentUrl: string, configFile: str
   const configPath = Path.join(__dirname, configFile);
   return loader.instantiateFromUrl(componentUrl, configPath, undefined, { variables });
 };
+
+/**
+ * Initializes the root container of the server.
+ * Useful for when the RootContainerInitializer was not instantiated.
+ */
+export const initServerStore = async(server: Server, baseUrl: string, headers: HeadersInit = {}): Promise<void> => {
+  const res = await fetch(baseUrl, {
+    method: 'PUT',
+    headers: {
+      ...headers,
+      'content-type': 'text/turtle',
+    },
+    body: '',
+  });
+  if (res.status >= 400) {
+    throw new HttpError(res.status, 'Error', res.statusText);
+  }
+};