test: add core subscription behavior tests

Author: crutchcorn

projects/angular-redux/src/tests/use-dispatch.spec.ts renamed to projects/angular-redux/src/tests/inject-dispatch.spec.ts

@@ -0,0 +1,67 @@
+import {InjectSelector, injectSelector, provideRedux} from '../public-api'
+import {Component} from "@angular/core";
+import {render} from "@testing-library/angular";
+import {AnyAction, createStore, Store} from "redux";
+import '@testing-library/jest-dom';
+
+type NormalStateType = {
+  count: number
+}
+let normalStore: Store<NormalStateType, AnyAction>
+let renderedItems: any[] = []
+type RootState = ReturnType<typeof normalStore.getState>
+const injectNormalSelector: InjectSelector<RootState> = injectSelector
+
+beforeEach(() => {
+  normalStore = createStore(
+    ({count}: NormalStateType = {count: -1}): NormalStateType => ({
+      count: count + 1,
+    }),
+  )
+  renderedItems = []
+})
+
+describe('injectSelector core subscription behavior', () => {
+  it('selects the state on initial render', async () => {
+    @Component({
+      selector: "app-root",
+      standalone: true,
+      template: "<div>Count: {{count()}}</div>"
+    })
+    class Testing {
+      count = injectNormalSelector((state) => state.count)
+    }
+
+    const {getByText} = await render(Testing, {
+      providers: [provideRedux({store: normalStore})]
+    })
+
+    expect(getByText("Count: 0")).toBeInTheDocument();
+  })
+
+  it('selects the state and renders the component when the store updates', async () => {
+    const selector = jest.fn((s: NormalStateType) => s.count)
+
+    @Component({
+      selector: "app-root",
+      standalone: true,
+      template: "<div>Count: {{count()}}</div>"
+    })
+    class Testing {
+      count = injectNormalSelector(selector)
+    }
+
+    const {findByText} = await render(Testing, {
+      providers: [provideRedux({store: normalStore})]
+    })
+
+    expect(await findByText("Count: 0")).toBeInTheDocument();
+    expect(selector).toHaveBeenCalledTimes(1)
+
+    normalStore.dispatch({ type: '' })
+
+
+    expect(await findByText("Count: 1")).toBeInTheDocument();
+    expect(selector).toHaveBeenCalledTimes(2)
+  })
+})