feat: create stage

packages/game/test/stage.test.ts

@@ -0,0 +1,25 @@
+import { test, expect } from '@jest/globals'
+import { Stage } from '../src/Stage'
+
+test('check stage condition', () => {
+  const stage = new Stage({
+    id: 'stage1',
+    name: 'List the files using `ls`',
+    condition: {
+      command: 'ls',
+      pwd: '/home/user',
+    },
+  })
+  expect(
+    stage.satisfies({
+      command: 'ls',
+      pwd: '/home/user',
+    })
+  ).toBe(true)
+  expect(
+    stage.satisfies({
+      command: 'ls',
+      pwd: '/home/user/Downloads',
+    })
+  ).toBe(false)
+})