feat: Filter class 구현, Filter 관련 컴포넌트 ts 적용

 - 기존의 상수화된 FILTER에서 Filter 객체를 갖고 있도록 변경 및 패키지 이전

src/_testUtils/render.js

@@ -5,7 +5,7 @@ import { filterState } from "../state/filterState";
 
 import { render } from "@testing-library/react";
 
-import { FILTER } from "../utils/filter";
+import { FILTER } from "../domain/Filter";
 
 export function renderWithRecoil(
   ui,

src/component/TodoFilter.test.tsx

@@ -0,0 +1,22 @@
+import React from "react";
+import { render } from "@testing-library/react";
+
+import TodoFilter, { Props } from "./TodoFilter";
+import Filter, { FILTER } from "../domain/Filter";
+
+describe("TodoFilter", () => {
+  function renderFilter({ selected, onSelect }: Props) {
+    return render(<TodoFilter selected={selected} onSelect={onSelect} />);
+  }
+
+  it("render all filterState btn", () => {
+    const { container } = renderFilter({
+      selected: FILTER.ALL,
+      onSelect: jest.fn(),
+    });
+
+    Object.values(FILTER).forEach((filter: Filter) =>
+      expect(container).toHaveTextContent(filter.getText()),
+    );
+  });
+});

src/component/TodoFilter.jsx → src/component/TodoFilter.tsx

@@ -2,19 +2,26 @@ import React from "react";
 
 import TodoFilterItem from "./TodoFilterItem";
 
-import { FILTER } from "../utils/filter";
+import Filter, { FILTER } from "../domain/Filter";
 
-export default function TodoFilter({ selected, onSelect }) {
+export interface Props {
+  selected: Filter;
+  onSelect: Function;
+}
+
+const TodoFilter: React.FC<Props> = ({ selected, onSelect }) => {
   return (
     <ul className="filters">
       {Object.values(FILTER).map((filter) => (
         <TodoFilterItem
-          key={filter.state}
+          key={filter.getState()}
           filter={filter}
           isSelected={selected === filter}
           onSelect={onSelect}
         />
       ))}
     </ul>
   );
-}
+};
+
+export default TodoFilter;

src/component/TodoFilterItem.test.jsx → src/component/TodoFilterItem.test.tsx

@@ -1,12 +1,14 @@
 import React from "react";
 import { render, fireEvent } from "@testing-library/react";
+// @ts-ignore
 import context from "jest-plugin-context";
 
 import TodoFilterItem from "./TodoFilterItem";
-import { FILTER, findFilterByState } from "../utils/filter";
+import Filter, { FILTER } from "../domain/Filter";
+import { Props } from "./TodoFilterItem";
 
 describe("TodoFilterItem", () => {
-  function renderItem({ filter, isSelected, onSelect }) {
+  function renderItem({ filter, isSelected, onSelect }: Props) {
     return render(
       <TodoFilterItem
         filter={filter}
@@ -19,25 +21,31 @@ describe("TodoFilterItem", () => {
   context("when selected", () => {
     const filter = FILTER.ALL;
     const isSelected = true;
+    const onSelect = jest.fn();
 
     it("render filterState btn with selected class", () => {
-      const { getByText } = renderItem({ filter, isSelected });
-      const $btn = getByText(filter.text);
+      const { getByText } = renderItem({
+        filter,
+        isSelected,
+        onSelect,
+      });
+      const $btn = getByText(filter.getText());
 
-      expect($btn).toHaveClass(filter.state);
+      expect($btn).toHaveClass(filter.getState());
       expect($btn).toHaveClass("selected");
     });
   });
 
   context("when not selected", () => {
     const filter = FILTER.ALL;
     const isSelected = false;
+    const onSelect = jest.fn();
 
     it("render filterState btn without selected class", () => {
-      const { getByText } = renderItem({ filter, isSelected });
-      const $btn = getByText(filter.text);
+      const { getByText } = renderItem({ filter, isSelected, onSelect });
+      const $btn = getByText(filter.getText());
 
-      expect($btn).toHaveClass(filter.state);
+      expect($btn).toHaveClass(filter.getState());
       expect($btn).not.toHaveClass("selected");
     });
   });
@@ -47,10 +55,10 @@ describe("TodoFilterItem", () => {
     const isSelected = false;
     const onSelect = jest.fn();
     const { getByText } = renderItem({ filter, isSelected, onSelect });
-    const $btn = getByText(filter.text);
+    const $btn = getByText(filter.getText());
 
     fireEvent.click($btn);
 
-    expect(onSelect).toBeCalledWith(findFilterByState(filter.state));
+    expect(onSelect).toBeCalledWith(Filter.findFilter(filter));
   });
 });

src/component/TodoFilterItem.tsx

@@ -0,0 +1,32 @@
+import React from "react";
+import Filter from "../domain/Filter";
+
+export interface Props {
+  filter: Filter;
+  isSelected: boolean;
+  onSelect: Function;
+}
+
+const TodoFilterItem: React.FC<Props> = ({ filter, isSelected, onSelect }) => {
+  const className = [filter.getState(), isSelected ? "selected" : ""]
+    .join(" ")
+    .trim();
+
+  const handleSelectFilter = () => {
+    const selected = Filter.findFilter(filter);
+    onSelect(selected);
+  };
+
+  return (
+    <li>
+      <a
+        className={className}
+        href={filter.getHref()}
+        onClick={handleSelectFilter}>
+        {filter.getText()}
+      </a>
+    </li>
+  );
+};
+
+export default TodoFilterItem;

src/component/TodoListContainer.test.jsx

@@ -5,7 +5,7 @@ import context from "jest-plugin-context";
 import { renderWithRecoil } from "../_testUtils/render";
 
 import TodoListContainer from "./TodoListContainer";
-import { FILTER } from "../utils/filter";
+import { FILTER } from "../domain/Filter";
 
 const INCOMPLETE_TODO = { id: 1, content: "incomplete", completed: false };
 const COMPLETED_TODO = { id: 2, content: "completed", completed: true };
@@ -87,7 +87,7 @@ describe("TodoListContainer", () => {
 
     it("render only complete todo", () => {
       const { container, getByText } = renderContainer({ todos });
-      const $completedFilterBtn = getByText(filter.text);
+      const $completedFilterBtn = getByText(filter.getText());
 
       fireEvent.click($completedFilterBtn);
 
@@ -102,7 +102,7 @@ describe("TodoListContainer", () => {
 
     it("render only complete todo", () => {
       const { container, getByText } = renderContainer({ todos });
-      const $activeFilterBtn = getByText(filter.text);
+      const $activeFilterBtn = getByText(filter.getText());
 
       fireEvent.click($activeFilterBtn);
 

src/domain/Filter.ts

@@ -0,0 +1,41 @@
+export default class Filter {
+  constructor(
+    private state: string,
+    private text: string,
+    private href: string,
+  ) {}
+
+  public static findFilter(target: Filter) {
+    return Object.values(FILTER).find((filter: Filter) =>
+      filter.isSame(target),
+    );
+  }
+
+  private isSame(target: Filter) {
+    return this === target;
+  }
+
+  public getState() {
+    return this.state;
+  }
+
+  public getText() {
+    return this.text;
+  }
+
+  public getHref() {
+    return this.href;
+  }
+}
+
+const ALL: Filter = new Filter("all", "전체보기", "/#");
+const ACTIVE: Filter = new Filter("active", "해야할 일", "/#active");
+const COMPLETED: Filter = new Filter("completed", "완료한 일", "/#completed");
+
+const FILTER = {
+  ALL,
+  ACTIVE,
+  COMPLETED,
+};
+
+export { FILTER };

src/state/filterState.js

@@ -1,5 +1,5 @@
 import { atom } from "recoil";
-import { FILTER } from "../utils/filter";
+import { FILTER } from "../domain/Filter";
 
 export const filterState = atom({
   key: "filterState",

src/state/todoState.js

@@ -1,7 +1,6 @@
 import { atom, selector } from "recoil";
 import { filterState } from "./filterState";
-
-import { FILTER } from "../utils/filter";
+import { FILTER } from "../domain/Filter";
 
 export const todoState = atom({
   key: "todoState",