add specs for ICS retriever

mocks/crawler.mock.js

@@ -0,0 +1,28 @@
+let mockCrawlResult = null
+
+const mockCrawl = (url, { logger }) => {
+  return mockCrawlResult
+}
+
+const setMockCrawlResult = (result) => {
+  mockCrawlResult = new Promise((resolve, reject) => {
+    resolve(result)
+  })
+}
+
+const setMockCrawlErrorResult = (error) => {
+  mockCrawlResult = new Promise((resolve, reject) => {
+    reject(error)
+  })
+}
+
+const clearMockCrawlResult = () => {
+  mockCrawlResult = null
+}
+
+module.exports = {
+  mockCrawl,
+  setMockCrawlResult,
+  setMockCrawlErrorResult,
+  clearMockCrawlResult,
+}