Add requester.

packages/core/src/__tests__/requester.test.ts

@@ -0,0 +1,42 @@
+import staat from '../staat';
+import { Staat } from '../types';
+
+type TestState = {
+  count: number;
+};
+
+const state: TestState = {
+  count: 37,
+};
+
+describe('requester', () => {
+  let sut: Staat<TestState>;
+  beforeEach(() => {
+    sut = staat(state);
+  });
+
+  it('selects from state', async () => {
+    let value: number = 10;
+    await sut.request(async ({ select }) => {
+      value = select(s => s.count);
+    });
+
+    expect(value).toBe(37);
+  });
+
+  it('reduces state', async () => {
+    await sut.request(async ({ reduce }) => {
+      reduce(s => ({ ...s, count: 99 }));
+    });
+
+    expect(sut.currentState.count).toBe(99);
+  });
+
+  it('accepts arguments', async () => {
+    await sut.request(async ({ reduce }, value: number) => {
+      reduce(s => ({ ...s, count: value }));
+    }, 489);
+
+    expect(sut.currentState.count).toBe(489);
+  });
+});

packages/core/src/__tests__/staat.test.ts

@@ -102,6 +102,7 @@ describe('staat', () => {
       expect(typeof sut.subscribe).toBe('function');
       expect(typeof sut.unsubscribe).toBe('function');
       expect(typeof sut.reduce).toBe('function');
+      expect(typeof sut.request).toBe('function');
     });
 
     it('reduces the value', () => {