refactor: clean up baseSlice and tests, ensure correct usage and 100% coverage

Author: rgilks

app/store/baseSlice.test.ts

@@ -0,0 +1,38 @@
+import { create } from 'zustand';
+import { immer } from 'zustand/middleware/immer';
+import { createBaseSlice, BaseSlice } from './baseSlice';
+
+describe('baseSlice', () => {
+  let store: ReturnType<typeof setupStore>;
+
+  type Store = BaseSlice;
+  const setupStore = () =>
+    create<Store>()(
+      immer((set) => ({
+        ...createBaseSlice(set),
+      }))
+    );
+
+  beforeEach(() => {
+    store = setupStore();
+  });
+
+  it('should have initial state', () => {
+    expect(store.getState().loading).toBe(false);
+    expect(store.getState().error).toBeNull();
+  });
+
+  it('setLoading updates loading', () => {
+    store.getState().setLoading(true);
+    expect(store.getState().loading).toBe(true);
+    store.getState().setLoading(false);
+    expect(store.getState().loading).toBe(false);
+  });
+
+  it('setError updates error', () => {
+    store.getState().setError('error message');
+    expect(store.getState().error).toBe('error message');
+    store.getState().setError(null);
+    expect(store.getState().error).toBeNull();
+  });
+});