Add utilities and initial test coverage

src/testUtils/mockDb.ts

@@ -0,0 +1,72 @@
+export class MockTable<T extends { id: string }> {
+  items: T[];
+
+  constructor(items: T[] = []) {
+    this.items = items.slice();
+  }
+
+  async toArray() {
+    return [...this.items];
+  }
+
+  async add(item: T) {
+    this.items.push(item);
+    return item.id;
+  }
+
+  async get(id: string) {
+    return this.items.find((i) => i.id === id);
+  }
+
+  async put(item: T) {
+    const idx = this.items.findIndex((i) => i.id === item.id);
+    if (idx >= 0) {
+      this.items[idx] = item;
+    } else {
+      this.items.push(item);
+    }
+    return item.id;
+  }
+
+  async delete(id: string) {
+    this.items = this.items.filter((i) => i.id !== id);
+  }
+
+  where(field: string) {
+    return {
+      equals: (val: any) => ({
+        first: async () => this.items.find((it: any) => it[field] === val),
+        count: async () => this.items.filter((it: any) => it[field] === val).length,
+        filter: (pred: (it: any) => boolean) => ({
+          first: async () => this.items.find((it: any) => it[field] === val && pred(it)),
+        }),
+      }),
+    };
+  }
+
+  filter(pred: (it: any) => boolean) {
+    const filtered = this.items.filter(pred);
+    return {
+      delete: async () => {
+        this.items = this.items.filter((it) => !pred(it));
+      },
+      first: async () => filtered[0],
+    };
+  }
+}
+
+export const createMockDb = (data?: any) => {
+  return {
+    products: new MockTable(data?.products ?? []),
+    categories: new MockTable(data?.categories ?? []),
+    areas: new MockTable(data?.areas ?? []),
+    pickLists: new MockTable(data?.pickLists ?? []),
+    pickItems: new MockTable(data?.pickItems ?? []),
+    importExportLogs: new MockTable<any>([]),
+    transaction: async (_mode: string, ...args: any[]) => {
+      const cb = args[args.length - 1];
+      if (typeof cb === 'function') return cb();
+      return undefined;
+    },
+  };
+};

src/testUtils/stubDownloads.ts

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+export const stubDownloads = (vi: any) => {
+  const anchor = { href: '', download: '', click: vi.fn() } as any;
+  const createObjectURL = vi.fn(() => 'blob:url');
+  const revokeObjectURL = vi.fn();
+  vi.stubGlobal('document', { createElement: () => anchor });
+  vi.stubGlobal('URL', { createObjectURL, revokeObjectURL });
+  return { anchor, createObjectURL, revokeObjectURL };
+};