import { createStructuredSelector } from "./createStructuredSelector";
import assert from "assert";
import { getSelector } from "./getSelector";
import { computable } from "./computable";

describe("createStructuredSelector", function () {
   it("works", function () {
      let structure = {
         name: getSelector({ bind: "name" }),
      };
      let state = { name: "Joe" };
      let selector = createStructuredSelector(structure);
      assert.deepEqual(selector(state), { name: "Joe" });
   });

   it("does not memoize by default", function () {
      let computes = 0;
      let structure = {
         name: computable("name", (name) => {
            computes++;
            return name;
         }),
      };
      let state = { name: "Joe" };
      let selector = createStructuredSelector(structure);
      assert.deepEqual(selector(state), { name: "Joe" });
      selector(state);
      assert.deepEqual(computes, 2);
   });

   it("supports memoize", function () {
      let computes = 0;
      let structure = {
         name: computable("name", (name) => {
            computes++;
            return name;
         }),
      };
      let state = { name: "Joe" };
      let selector = createStructuredSelector(structure).memoize();
      assert.deepEqual(selector(state), { name: "Joe" });
      selector(state);
      assert.deepEqual(computes, 1);
   });
});