feat: add mock jsonFile cache

packages/scripts/src/commands/app-data/convert/cacheStrategy/jsonFile.mock.ts

@@ -0,0 +1,46 @@
+import { TimeLike } from "fs";
+import { JsonFileCache } from "./jsonFile";
+import { IContentsEntry } from "shared";
+
+interface IContentsEntryWithValue extends IContentsEntry {
+  value?: any;
+}
+
+/**
+ * Mock implementation of JsonFileCache that only uses in-memory caching
+ * instead of persisting files to disk
+ */
+export class MockJsonFileCache extends JsonFileCache {
+  private mockContents: Record<string, IContentsEntryWithValue> = {};
+
+  constructor() {
+    super("", 0);
+  }
+
+  public add(data: any, entryName?: string, stats?: { mtime: TimeLike }) {
+    if (data) {
+      if (!entryName) {
+        entryName = this.generateCacheEntryName(data);
+      }
+      if (!this.mockContents[entryName]) {
+        this.mockContents[entryName] = {} as any;
+      }
+      this.mockContents[entryName].value = data;
+      return { filePath: entryName, entryName, data };
+    }
+  }
+
+  public clear() {
+    this.mockContents = {};
+  }
+
+  public remove(entryName: string) {
+    if (this.mockContents.hasOwnProperty(entryName)) {
+      delete this.mockContents[entryName];
+    }
+  }
+
+  public get<T = any>(entryName: string) {
+    return this.mockContents[entryName] as T;
+  }
+}

packages/scripts/src/commands/app-data/convert/cacheStrategy/jsonFile.ts

@@ -34,7 +34,10 @@ export class JsonFileCache {
 
   constructor(folderPath: string, version: number) {
     this.version = version;
-    this.setup(folderPath);
+    // HACK - support tests by avoiding setup if folderPath not provided
+    if (folderPath) {
+      this.setup(folderPath);
+    }
   }
 
   /**