add blocks.turnOnce and tests

frontend/src/App.test.tsx

@@ -1,9 +1,15 @@
-import React from 'react';
-import { render, screen } from '@testing-library/react';
-import App from './App';
+// import React from 'react';
+// import { render, screen } from '@testing-library/react';
+// import App from './App';
 
-test('renders learn react link', () => {
-  render(<App />);
-  const linkElement = screen.getByText(/learn react/i);
-  expect(linkElement).toBeInTheDocument();
+// // test('renders learn react link', () => {
+// //   render(<App />);
+// //   const linkElement = screen.getByText(/learn react/i);
+// //   expect(linkElement).toBeInTheDocument();
+// // });
+
+test('example', () => {
+  expect(1 + 1).toBe(2);
 });
+
+export {};

frontend/src/features/blocks/index.test.ts

@@ -0,0 +1,25 @@
+import * as block from './index';
+
+test('turnOnce', () => {
+  const dataSet: [number, number, number, number, number, number][] = [
+    // centerが0だった場合
+    [1, 1, 0, 0, 1, -1],
+    [-1, -1, 0, 0, -1, 1],
+    [2, -1, 0, 0, -1, -2],
+    [-1, 3, 0, 0, 3, 1],
+
+    // centerが0以外の場合
+    [4, 4, 3, 3, 4, 2],
+    [2, 2, 3, 3, 2, 4],
+
+    [0, 0, 0.5, 0.5, 0, 1],
+    [1, 1, 0.5, 0.5, 1, 0],
+  ];
+
+  for (const [x, y, centerX, centerY, resultX, resultY] of dataSet) {
+    expect(block.turnOnce(x, y, centerX, centerY)).toStrictEqual([
+      resultX,
+      resultY,
+    ]);
+  }
+});

frontend/src/features/blocks/index.ts

@@ -20,6 +20,10 @@ export type BlockShapeType = Readonly<{
   }>;
 }>;
 
+export type MoveType = 'left' | 'right' | 'turn';
+
+export type Turn = 0 | 1 | 2 | 3;
+
 export const BLOCK_TYPES: Readonly<BlockType[]> = [
   'i',
   'o',
@@ -149,3 +153,10 @@ export const getNextBlock = (
     y: fallingBlock.y - 1,
   };
 };
+
+export const turnOnce = (
+  x: number,
+  y: number,
+  centerX: number,
+  centerY: number
+) => [centerX + y - centerY, centerY - (x - centerX)];