feat(auth): create selectors for authStore; cover them with tests

src/features/auth/model/selectors/index.ts

@@ -0,0 +1,2 @@
+export * from "./selectFormValid/selectFormValid";
+export * from "./selectAuthData/selectAuthData";

src/features/auth/model/selectors/selectAuthData/selectAuthData.spec.ts

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+import { useAuthStore } from "../../stores/authStore/authStore";
+import { selectAuthData } from "./selectAuthData";
+import { MOCK_EMAIL, MOCK_PASSWORD } from "../../../api/calls/mocks";
+
+describe("selectAuthData", () => {
+  it("should return the correct auth data", () => {
+    useAuthStore.getState().setEmail(MOCK_EMAIL);
+    useAuthStore.getState().setPassword(MOCK_PASSWORD);
+    expect(selectAuthData(useAuthStore.getState())).toEqual({
+      email: MOCK_EMAIL,
+      password: MOCK_PASSWORD,
+    });
+  });
+});

src/features/auth/model/selectors/selectAuthData/selectAuthData.ts

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+import type { AuthData } from "../../types/service";
+import type { AuthStore } from "../../types/store";
+
+export const selectAuthData = (state: AuthStore): AuthData => ({
+  email: state.formData.email.value,
+  password: state.formData.password.value,
+});

src/features/auth/model/selectors/selectFormValid/selectFormValid.spec.ts

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+import { MOCK_EMAIL, MOCK_PASSWORD } from "../../../api/calls/mocks";
+import { useAuthStore } from "../../stores/authStore/authStore";
+import { selectFormValid } from "./selectFormValid";
+
+describe("selectFormValid", () => {
+  afterEach(() => {
+    useAuthStore.getState().reset();
+  });
+
+  it("should be false when email is invalid", () => {
+    useAuthStore.getState().setEmail("");
+    expect(selectFormValid(useAuthStore.getState())).toBe(false);
+  });
+
+  it("should be false when password is invalid", () => {
+    useAuthStore.getState().setPassword("");
+    expect(selectFormValid(useAuthStore.getState())).toBe(false);
+  });
+
+  it("should be true when email and password are valid", () => {
+    useAuthStore.getState().setEmail(MOCK_EMAIL);
+    useAuthStore.getState().setPassword(MOCK_PASSWORD);
+    expect(selectFormValid(useAuthStore.getState())).toBe(true);
+  });
+});

src/features/auth/model/selectors/selectFormValid/selectFormValid.ts

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+import type { AuthStore } from "../../types/store";
+
+export const selectFormValid = (state: AuthStore) =>
+  Object.values(state.formData).every((field) => field.valid);