Add store tests with mocked axios and apiError

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/stores/loading.test.js

@@ -0,0 +1,27 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+import { setActivePinia, createPinia } from 'pinia';
+import useLoadingStore from '@/stores/loading.js';
+
+describe('loadingStore', () => {
+  let store;
+
+  beforeEach(() => {
+    setActivePinia(createPinia());
+    store = useLoadingStore();
+  });
+
+  it('has isLoading true by default', () => {
+    expect(store.isLoading).toBe(true);
+  });
+
+  it('setIsLoading sets to false', () => {
+    store.setIsLoading(false);
+    expect(store.isLoading).toBe(false);
+  });
+
+  it('setIsLoading sets to true', () => {
+    store.setIsLoading(false);
+    store.setIsLoading(true);
+    expect(store.isLoading).toBe(true);
+  });
+});