diff --git a/docs/REFACTOR-AND-TEST.md b/docs/REFACTOR-AND-TEST.md
new file mode 100644
index 0000000..980bf1f
--- /dev/null
+++ b/docs/REFACTOR-AND-TEST.md
@@ -0,0 +1,60 @@
+# Vitest + Clean Architecture Refactoring
+
+## Цель
+
+Установить Vitest, переделать архитектуру ближе к чистой (порты/адаптеры),
+написать нехрупкие тесты на реальные юзкейсы.
+
+## Изменения
+
+### Новые файлы
+
+```txt
+src/
+├── ports.ts                    # Интерфейсы: IFileSystem, ITaskRepository, IConfigProvider
+├── storage/
+│   ├── FsTaskRepository.ts     # ITaskRepository → зависит только от IFileSystem, markdown, uuid
+│   ├── VscodeConfigProvider.ts # IConfigProvider → зависит от vscode
+│   └── NodeFileSystem.ts       # IFileSystem → обёртка над fs.promises
+
+tests/
+├── utils/
+│   ├── markdown.test.ts
+│   └── uuid.test.ts
+├── storage/
+│   ├── FsTaskRepository.test.ts
+│   └── helpers/
+│       └── InMemoryFileSystem.ts
+```
+
+### Удалить
+
+- `src/storage/taskStore.ts`
+- `src/storage/configStore.ts`
+
+### Изменить
+
+- `src/views/taskTreeProvider.ts` — конструктор принимает `ITaskRepository` +
+  `IConfigProvider`
+- `src/extension.ts` — сборка зависимостей (DI)
+
+### Инфраструктура
+
+- `npm i -D vitest`
+- `vitest.config.ts`
+- `package.json` — скрипты `test`, `test:run`
+
+## Тесты
+
+| Тест               | I/O                      | Что проверяет                                |
+| ------------------ | ------------------------ | -------------------------------------------- |
+| FsTaskRepository   | InMemoryFileSystem (Map) | CRUD, фильтрация по extension, контент файла |
+| markdown           | —                        | parse, serialize, round-trip, default-ы      |
+| uuid               | —                        | валидный формат, уникальность                |
+| InMemoryFileSystem | —                        | read/write/readdir/mkdir                     |
+
+## Что НЕ тестируем (пока)
+
+- NodeFileSystem — тривиальная обёртка
+- VscodeConfigProvider — требует Extension Host
+- TaskTreeProvider — UI, требует Extension Host
diff --git a/package-lock.json b/package-lock.json
index d122f17..27bf072 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,208 +1,1489 @@
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-  }
+	"name": "xboct-flow",
+	"version": "0.0.1",
+	"lockfileVersion": 3,
+	"requires": true,
+	"packages": {
+		"": {
+			"name": "xboct-flow",
+			"version": "0.0.1",
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+				"vitest": "^4.1.10"
+			},
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+			"resolved": "https://registry.npmjs.org/rolldown/-/rolldown-1.1.5.tgz",
+			"integrity": "sha512-t9z29cJjXf/vxQ8dyhCSpt6H6aSwHTk8cT5I3iy6SMXuFpk5mB6PL6XfC8PCwrPTx93udwKUm9HRteAlTGBLiA==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"@oxc-project/types": "=0.139.0",
+				"@rolldown/pluginutils": "^1.0.0"
+			},
+			"bin": {
+				"rolldown": "bin/cli.mjs"
+			},
+			"engines": {
+				"node": "^20.19.0 || >=22.12.0"
+			},
+			"optionalDependencies": {
+				"@rolldown/binding-android-arm64": "1.1.5",
+				"@rolldown/binding-darwin-arm64": "1.1.5",
+				"@rolldown/binding-darwin-x64": "1.1.5",
+				"@rolldown/binding-freebsd-x64": "1.1.5",
+				"@rolldown/binding-linux-arm-gnueabihf": "1.1.5",
+				"@rolldown/binding-linux-arm64-gnu": "1.1.5",
+				"@rolldown/binding-linux-arm64-musl": "1.1.5",
+				"@rolldown/binding-linux-ppc64-gnu": "1.1.5",
+				"@rolldown/binding-linux-s390x-gnu": "1.1.5",
+				"@rolldown/binding-linux-x64-gnu": "1.1.5",
+				"@rolldown/binding-linux-x64-musl": "1.1.5",
+				"@rolldown/binding-openharmony-arm64": "1.1.5",
+				"@rolldown/binding-wasm32-wasi": "1.1.5",
+				"@rolldown/binding-win32-arm64-msvc": "1.1.5",
+				"@rolldown/binding-win32-x64-msvc": "1.1.5"
+			}
+		},
+		"node_modules/section-matter": {
+			"version": "1.0.0",
+			"resolved": "https://registry.npmjs.org/section-matter/-/section-matter-1.0.0.tgz",
+			"integrity": "sha512-vfD3pmTzGpufjScBh50YHKzEu2lxBWhVEHsNGoEXmCmn2hKGfeNLYMzCJpe8cD7gqX7TJluOVpBkAequ6dgMmA==",
+			"license": "MIT",
+			"dependencies": {
+				"extend-shallow": "^2.0.1",
+				"kind-of": "^6.0.0"
+			},
+			"engines": {
+				"node": ">=4"
+			}
+		},
+		"node_modules/siginfo": {
+			"version": "2.0.0",
+			"resolved": "https://registry.npmjs.org/siginfo/-/siginfo-2.0.0.tgz",
+			"integrity": "sha512-ybx0WO1/8bSBLEWXZvEd7gMW3Sn3JFlW3TvX1nREbDLRNQNaeNN8WK0meBwPdAaOI7TtRRRJn/Es1zhrrCHu7g==",
+			"dev": true,
+			"license": "ISC"
+		},
+		"node_modules/source-map-js": {
+			"version": "1.2.1",
+			"resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.2.1.tgz",
+			"integrity": "sha512-UXWMKhLOwVKb728IUtQPXxfYU+usdybtUrK/8uGE8CQMvrhOpwvzDBwj0QhSL7MQc7vIsISBG8VQ8+IDQxpfQA==",
+			"dev": true,
+			"license": "BSD-3-Clause",
+			"engines": {
+				"node": ">=0.10.0"
+			}
+		},
+		"node_modules/sprintf-js": {
+			"version": "1.0.3",
+			"resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
+			"integrity": "sha512-D9cPgkvLlV3t3IzL0D0YLvGA9Ahk4PcvVwUbN0dSGr1aP0Nrt4AEnTUbuGvquEC0mA64Gqt1fzirlRs5ibXx8g==",
+			"license": "BSD-3-Clause"
+		},
+		"node_modules/stackback": {
+			"version": "0.0.2",
+			"resolved": "https://registry.npmjs.org/stackback/-/stackback-0.0.2.tgz",
+			"integrity": "sha512-1XMJE5fQo1jGH6Y/7ebnwPOBEkIEnT4QF32d5R1+VXdXveM0IBMJt8zfaxX1P3QhVwrYe+576+jkANtSS2mBbw==",
+			"dev": true,
+			"license": "MIT"
+		},
+		"node_modules/std-env": {
+			"version": "4.2.0",
+			"resolved": "https://registry.npmjs.org/std-env/-/std-env-4.2.0.tgz",
+			"integrity": "sha512-oCUKSupKTHX53EyjDtuZQ64pjLJ6yYCtpmEw0goYxtjG9KpbRe8KAsl2tBUGU9DyMcJ0RwJ8GqJAFzMXcXW1Rw==",
+			"dev": true,
+			"license": "MIT"
+		},
+		"node_modules/strip-bom-string": {
+			"version": "1.0.0",
+			"resolved": "https://registry.npmjs.org/strip-bom-string/-/strip-bom-string-1.0.0.tgz",
+			"integrity": "sha512-uCC2VHvQRYu+lMh4My/sFNmF2klFymLX1wHJeXnbEJERpV/ZsVuonzerjfrGpIGF7LBVa1O7i9kjiWvJiFck8g==",
+			"license": "MIT",
+			"engines": {
+				"node": ">=0.10.0"
+			}
+		},
+		"node_modules/tinybench": {
+			"version": "2.9.0",
+			"resolved": "https://registry.npmjs.org/tinybench/-/tinybench-2.9.0.tgz",
+			"integrity": "sha512-0+DUvqWMValLmha6lr4kD8iAMK1HzV0/aKnCtWb9v9641TnP/MFb7Pc2bxoxQjTXAErryXVgUOfv2YqNllqGeg==",
+			"dev": true,
+			"license": "MIT"
+		},
+		"node_modules/tinyexec": {
+			"version": "1.2.4",
+			"resolved": "https://registry.npmjs.org/tinyexec/-/tinyexec-1.2.4.tgz",
+			"integrity": "sha512-SHf/r48b7vOrjve9PxJo3MN5v5yuyjHvdUcrQffT3WXMUfnGmHDVbC4k3sHJaJTgZCwpUplIaAo5ANtMyp3YHg==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">=18"
+			}
+		},
+		"node_modules/tinyglobby": {
+			"version": "0.2.17",
+			"resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.17.tgz",
+			"integrity": "sha512-wXR/dYpcqKmfWpEdZjiKJOwCNFndD0DMnrW/cYjVGttEkBfVgcLFHoNrlj47mjOVic9yyNu65alsgF4NQyTa2g==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"fdir": "^6.5.0",
+				"picomatch": "^4.0.4"
+			},
+			"engines": {
+				"node": ">=12.0.0"
+			},
+			"funding": {
+				"url": "https://github.com/sponsors/SuperchupuDev"
+			}
+		},
+		"node_modules/tinyrainbow": {
+			"version": "3.1.0",
+			"resolved": "https://registry.npmjs.org/tinyrainbow/-/tinyrainbow-3.1.0.tgz",
+			"integrity": "sha512-Bf+ILmBgretUrdJxzXM0SgXLZ3XfiaUuOj/IKQHuTXip+05Xn+uyEYdVg0kYDipTBcLrCVyUzAPz7QmArb0mmw==",
+			"dev": true,
+			"license": "MIT",
+			"engines": {
+				"node": ">=14.0.0"
+			}
+		},
+		"node_modules/tslib": {
+			"version": "2.8.1",
+			"resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
+			"integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
+			"dev": true,
+			"license": "0BSD",
+			"optional": true
+		},
+		"node_modules/typescript": {
+			"version": "5.9.3",
+			"resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
+			"integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
+			"dev": true,
+			"license": "Apache-2.0",
+			"bin": {
+				"tsc": "bin/tsc",
+				"tsserver": "bin/tsserver"
+			},
+			"engines": {
+				"node": ">=14.17"
+			}
+		},
+		"node_modules/undici-types": {
+			"version": "6.21.0",
+			"resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.21.0.tgz",
+			"integrity": "sha512-iwDZqg0QAGrg9Rav5H4n0M64c3mkR59cJ6wQp+7C4nI0gsmExaedaYLNO44eT4AtBBwjbTiGPMlt2Md0T9H9JQ==",
+			"dev": true,
+			"license": "MIT"
+		},
+		"node_modules/uuid": {
+			"version": "11.1.1",
+			"resolved": "https://registry.npmjs.org/uuid/-/uuid-11.1.1.tgz",
+			"integrity": "sha512-vIYxrBCC/N/K+Js3qSN88go7kIfNPssr/hHCesKCQNAjmgvYS2oqr69kIufEG+O4+PfezOH4EbIeHCfFov8ZgQ==",
+			"funding": [
+				"https://github.com/sponsors/broofa",
+				"https://github.com/sponsors/ctavan"
+			],
+			"license": "MIT",
+			"bin": {
+				"uuid": "dist/esm/bin/uuid"
+			}
+		},
+		"node_modules/vite": {
+			"version": "8.1.4",
+			"resolved": "https://registry.npmjs.org/vite/-/vite-8.1.4.tgz",
+			"integrity": "sha512-bTT9PsdWO+MQMNG9ZXIP/qM9wGh37DFxTV/sPq9cFpHr3w4jkgef032PkAL9jAqhk3Nz8NQw3O8n6/xFkqO4QQ==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"lightningcss": "^1.32.0",
+				"picomatch": "^4.0.5",
+				"postcss": "^8.5.16",
+				"rolldown": "~1.1.4",
+				"tinyglobby": "^0.2.17"
+			},
+			"bin": {
+				"vite": "bin/vite.js"
+			},
+			"engines": {
+				"node": "^20.19.0 || >=22.12.0"
+			},
+			"funding": {
+				"url": "https://github.com/vitejs/vite?sponsor=1"
+			},
+			"optionalDependencies": {
+				"fsevents": "~2.3.3"
+			},
+			"peerDependencies": {
+				"@types/node": "^20.19.0 || >=22.12.0",
+				"@vitejs/devtools": "^0.3.0",
+				"esbuild": "^0.27.0 || ^0.28.0",
+				"jiti": ">=1.21.0",
+				"less": "^4.0.0",
+				"sass": "^1.70.0",
+				"sass-embedded": "^1.70.0",
+				"stylus": ">=0.54.8",
+				"sugarss": "^5.0.0",
+				"terser": "^5.16.0",
+				"tsx": "^4.8.1",
+				"yaml": "^2.4.2"
+			},
+			"peerDependenciesMeta": {
+				"@types/node": {
+					"optional": true
+				},
+				"@vitejs/devtools": {
+					"optional": true
+				},
+				"esbuild": {
+					"optional": true
+				},
+				"jiti": {
+					"optional": true
+				},
+				"less": {
+					"optional": true
+				},
+				"sass": {
+					"optional": true
+				},
+				"sass-embedded": {
+					"optional": true
+				},
+				"stylus": {
+					"optional": true
+				},
+				"sugarss": {
+					"optional": true
+				},
+				"terser": {
+					"optional": true
+				},
+				"tsx": {
+					"optional": true
+				},
+				"yaml": {
+					"optional": true
+				}
+			}
+		},
+		"node_modules/vitest": {
+			"version": "4.1.10",
+			"resolved": "https://registry.npmjs.org/vitest/-/vitest-4.1.10.tgz",
+			"integrity": "sha512-R9jUTe5S4Qb0HCd4TNqpC7oGcrMssMRGXLW80ubjWsW9VH5GF8y1Y0SFLY9AbqSk6nt0PnOx4H4WNJYZ13GUPw==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"@vitest/expect": "4.1.10",
+				"@vitest/mocker": "4.1.10",
+				"@vitest/pretty-format": "4.1.10",
+				"@vitest/runner": "4.1.10",
+				"@vitest/snapshot": "4.1.10",
+				"@vitest/spy": "4.1.10",
+				"@vitest/utils": "4.1.10",
+				"es-module-lexer": "^2.0.0",
+				"expect-type": "^1.3.0",
+				"magic-string": "^0.30.21",
+				"obug": "^2.1.1",
+				"pathe": "^2.0.3",
+				"picomatch": "^4.0.3",
+				"std-env": "^4.0.0-rc.1",
+				"tinybench": "^2.9.0",
+				"tinyexec": "^1.0.2",
+				"tinyglobby": "^0.2.15",
+				"tinyrainbow": "^3.1.0",
+				"vite": "^6.0.0 || ^7.0.0 || ^8.0.0",
+				"why-is-node-running": "^2.3.0"
+			},
+			"bin": {
+				"vitest": "vitest.mjs"
+			},
+			"engines": {
+				"node": "^20.0.0 || ^22.0.0 || >=24.0.0"
+			},
+			"funding": {
+				"url": "https://opencollective.com/vitest"
+			},
+			"peerDependencies": {
+				"@edge-runtime/vm": "*",
+				"@opentelemetry/api": "^1.9.0",
+				"@types/node": "^20.0.0 || ^22.0.0 || >=24.0.0",
+				"@vitest/browser-playwright": "4.1.10",
+				"@vitest/browser-preview": "4.1.10",
+				"@vitest/browser-webdriverio": "4.1.10",
+				"@vitest/coverage-istanbul": "4.1.10",
+				"@vitest/coverage-v8": "4.1.10",
+				"@vitest/ui": "4.1.10",
+				"happy-dom": "*",
+				"jsdom": "*",
+				"vite": "^6.0.0 || ^7.0.0 || ^8.0.0"
+			},
+			"peerDependenciesMeta": {
+				"@edge-runtime/vm": {
+					"optional": true
+				},
+				"@opentelemetry/api": {
+					"optional": true
+				},
+				"@types/node": {
+					"optional": true
+				},
+				"@vitest/browser-playwright": {
+					"optional": true
+				},
+				"@vitest/browser-preview": {
+					"optional": true
+				},
+				"@vitest/browser-webdriverio": {
+					"optional": true
+				},
+				"@vitest/coverage-istanbul": {
+					"optional": true
+				},
+				"@vitest/coverage-v8": {
+					"optional": true
+				},
+				"@vitest/ui": {
+					"optional": true
+				},
+				"happy-dom": {
+					"optional": true
+				},
+				"jsdom": {
+					"optional": true
+				},
+				"vite": {
+					"optional": false
+				}
+			}
+		},
+		"node_modules/why-is-node-running": {
+			"version": "2.3.0",
+			"resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
+			"integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+			"dev": true,
+			"license": "MIT",
+			"dependencies": {
+				"siginfo": "^2.0.0",
+				"stackback": "0.0.2"
+			},
+			"bin": {
+				"why-is-node-running": "cli.js"
+			},
+			"engines": {
+				"node": ">=8"
+			}
+		}
+	}
 }
diff --git a/package.json b/package.json
index d420e8b..8fece8d 100644
--- a/package.json
+++ b/package.json
@@ -88,17 +88,21 @@
 		}
 	},
 	"scripts": {
-		"vscode:prepublish": "npm run compile",
-		"compile": "tsc -p ./",
-		"watch": "tsc -watch -p ./",
+		"build": "vite build",
+		"watch": "vite build --watch",
+		"vscode:prepublish": "npm run build",
 		"lint": "tsc --noEmit",
-		"format": "prettier --write ."
+		"format": "prettier --write .",
+		"test": "vitest",
+		"test:run": "vitest run"
 	},
 	"devDependencies": {
 		"@types/node": "^22.0.0",
 		"@types/uuid": "^10.0.0",
 		"@types/vscode": "^1.96.0",
-		"typescript": "^5.7.0"
+		"typescript": "^5.7.0",
+		"vite": "^8.1.4",
+		"vitest": "^4.1.10"
 	},
 	"dependencies": {
 		"gray-matter": "^4.0.3",
diff --git a/src/extension.ts b/src/extension.ts
index b5a44bc..2224da3 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -1,13 +1,18 @@
 import * as path from "path";
 import * as vscode from "vscode";
-import { ConfigStore } from "./storage/configStore";
-import { TaskStore } from "./storage/taskStore";
-import { TaskTreeProvider } from "./views/taskTreeProvider";
+import { FsTaskRepository } from "@/storage/FsTaskRepository";
+import { NodeFileSystem } from "@/storage/NodeFileSystem";
+import { VscodeConfigProvider } from "@/storage/VscodeConfigProvider";
+import { TaskTreeProvider } from "@/views/taskTreeProvider";
 
 export function activate(context: vscode.ExtensionContext) {
-	const taskStore = new TaskStore();
-	const configStore = new ConfigStore();
-	const taskTreeProvider = new TaskTreeProvider();
+	const fileSystem = new NodeFileSystem();
+	const configStore = new VscodeConfigProvider();
+	const taskStore = new FsTaskRepository(
+		fileSystem,
+		configStore.getFileExtension(),
+	);
+	const taskTreeProvider = new TaskTreeProvider(taskStore, configStore);
 
 	vscode.window.registerTreeDataProvider(
 		"projectTasks.tasks",
@@ -16,7 +21,8 @@ export function activate(context: vscode.ExtensionContext) {
 
 	const projectPath = configStore.getProjectTaskPath();
 	if (projectPath) {
-		const taskPattern = path.join(projectPath, "*.task.md").replace(/\\/g, "/");
+		const ext = configStore.getFileExtension();
+		const taskPattern = path.join(projectPath, `*${ext}`).replace(/\\/g, "/");
 		const watcher = vscode.workspace.createFileSystemWatcher(taskPattern);
 		watcher.onDidCreate(() => taskTreeProvider.refresh());
 		watcher.onDidChange(() => taskTreeProvider.refresh());
@@ -48,7 +54,7 @@ export function activate(context: vscode.ExtensionContext) {
 				return;
 			}
 
-			await taskStore.createTask(projectPath, {
+			await taskStore.create(projectPath, {
 				title,
 				description: "",
 				status: "todo",
diff --git a/src/ports.ts b/src/ports.ts
new file mode 100644
index 0000000..01b2e31
--- /dev/null
+++ b/src/ports.ts
@@ -0,0 +1,26 @@
+import { Task } from "@/model/task";
+
+export interface IFileSystem {
+	readFile(path: string): Promise<string>;
+	writeFile(path: string, content: string): Promise<void>;
+	deleteFile(path: string): Promise<void>;
+	readdir(path: string): Promise<string[]>;
+	mkdir(path: string): Promise<void>;
+}
+
+export interface ITaskRepository {
+	list(folderPath: string): Promise<Task[]>;
+	getById(folderPath: string, id: string): Promise<Task | undefined>;
+	create(
+		folderPath: string,
+		task: Omit<Task, "id" | "created" | "updated">,
+	): Promise<Task>;
+	update(folderPath: string, task: Task): Promise<void>;
+	delete(folderPath: string, id: string): Promise<void>;
+}
+
+export interface IConfigProvider {
+	getProjectTaskPath(): string | undefined;
+	getGlobalTaskPath(): string | undefined;
+	getFileExtension(): string;
+}
diff --git a/src/storage/FsTaskRepository.ts b/src/storage/FsTaskRepository.ts
new file mode 100644
index 0000000..3df7496
--- /dev/null
+++ b/src/storage/FsTaskRepository.ts
@@ -0,0 +1,104 @@
+import { Task } from "@/model/task";
+import { IFileSystem, ITaskRepository } from "@/ports";
+import { parseTaskFile, serializeTask } from "@/utils/markdown";
+import { generateId } from "@/utils/uuid";
+
+export class FsTaskRepository implements ITaskRepository {
+	constructor(
+		private fs: IFileSystem,
+		private fileExtension: string,
+	) {}
+
+	async list(folderPath: string): Promise<Task[]> {
+		let entries: string[];
+		try {
+			entries = await this.fs.readdir(folderPath);
+		} catch {
+			return [];
+		}
+
+		const files = entries.filter((name) => name.endsWith(this.fileExtension));
+		const tasks: Task[] = [];
+
+		for (const file of files) {
+			try {
+				const fullPath = this.joinPath(folderPath, file);
+				const content = await this.fs.readFile(fullPath);
+				const task = parseTaskFile(content);
+				if (!task.id) continue;
+				tasks.push(task);
+			} catch {
+				// skip unparseable files
+			}
+		}
+
+		return tasks.sort(
+			(a, b) => new Date(b.updated).getTime() - new Date(a.updated).getTime(),
+		);
+	}
+
+	async getById(folderPath: string, id: string): Promise<Task | undefined> {
+		const tasks = await this.list(folderPath);
+		return tasks.find((t) => t.id === id);
+	}
+
+	async create(
+		folderPath: string,
+		task: Omit<Task, "id" | "created" | "updated">,
+	): Promise<Task> {
+		const now = new Date().toISOString();
+		const newTask: Task = {
+			...task,
+			id: generateId(),
+			created: now,
+			updated: now,
+		};
+
+		await this.fs.mkdir(folderPath);
+		const filePath = this.taskFilePath(folderPath, newTask);
+		await this.fs.writeFile(filePath, serializeTask(newTask));
+
+		return newTask;
+	}
+
+	async update(folderPath: string, task: Task): Promise<void> {
+		const existing = await this.getById(folderPath, task.id);
+		const updatedTask = { ...task, updated: new Date().toISOString() };
+		const newPath = this.taskFilePath(folderPath, updatedTask);
+
+		if (existing) {
+			const oldPath = this.taskFilePath(folderPath, existing);
+			if (oldPath !== newPath) {
+				await this.fs.deleteFile(oldPath).catch(() => {});
+			}
+		}
+
+		await this.fs.writeFile(newPath, serializeTask(updatedTask));
+	}
+
+	async delete(folderPath: string, id: string): Promise<void> {
+		const task = await this.getById(folderPath, id);
+		if (!task) return;
+
+		const filePath = this.taskFilePath(folderPath, task);
+		try {
+			await this.fs.deleteFile(filePath);
+		} catch {
+			// already gone
+		}
+	}
+
+	private taskFilePath(folderPath: string, task: Task): string {
+		const safeName = task.title
+			.toLowerCase()
+			.replace(/[^a-z0-9\u0400-\u04FF]+/g, "-")
+			.replace(/^-|-$/g, "")
+			.slice(0, 80);
+
+		return this.joinPath(folderPath, `${safeName}${this.fileExtension}`);
+	}
+
+	private joinPath(...segments: string[]): string {
+		return segments.join("/").replace(/\\/g, "/");
+	}
+}
diff --git a/src/storage/NodeFileSystem.ts b/src/storage/NodeFileSystem.ts
new file mode 100644
index 0000000..c88985c
--- /dev/null
+++ b/src/storage/NodeFileSystem.ts
@@ -0,0 +1,25 @@
+import * as fs from "fs";
+import { IFileSystem } from "@/ports";
+
+export class NodeFileSystem implements IFileSystem {
+	async readFile(path: string): Promise<string> {
+		return fs.promises.readFile(path, "utf-8");
+	}
+
+	async writeFile(path: string, content: string): Promise<void> {
+		await fs.promises.writeFile(path, content, "utf-8");
+	}
+
+	async deleteFile(path: string): Promise<void> {
+		await fs.promises.unlink(path);
+	}
+
+	async readdir(path: string): Promise<string[]> {
+		const entries = await fs.promises.readdir(path, { withFileTypes: true });
+		return entries.filter((e) => e.isFile()).map((e) => e.name);
+	}
+
+	async mkdir(path: string): Promise<void> {
+		await fs.promises.mkdir(path, { recursive: true });
+	}
+}
diff --git a/src/storage/configStore.ts b/src/storage/VscodeConfigProvider.ts
similarity index 81%
rename from src/storage/configStore.ts
rename to src/storage/VscodeConfigProvider.ts
index 0c726e4..a8a21e8 100644
--- a/src/storage/configStore.ts
+++ b/src/storage/VscodeConfigProvider.ts
@@ -1,7 +1,8 @@
 import * as path from "path";
 import * as vscode from "vscode";
+import { IConfigProvider } from "@/ports";
 
-export class ConfigStore {
+export class VscodeConfigProvider implements IConfigProvider {
 	getProjectTaskPath(): string | undefined {
 		const workspaceRoot = vscode.workspace.workspaceFolders?.[0]?.uri.fsPath;
 		if (!workspaceRoot) return undefined;
@@ -13,8 +14,7 @@ export class ConfigStore {
 
 	getGlobalTaskPath(): string | undefined {
 		const config = vscode.workspace.getConfiguration("projectTasks");
-		const globalPath = config.get<string>("globalPath");
-		return globalPath || undefined;
+		return config.get<string>("globalPath") || undefined;
 	}
 
 	getFileExtension(): string {
diff --git a/src/storage/taskStore.ts b/src/storage/taskStore.ts
deleted file mode 100644
index 6044865..0000000
--- a/src/storage/taskStore.ts
+++ /dev/null
@@ -1,114 +0,0 @@
-import * as vscode from "vscode";
-import * as path from "path";
-import * as fs from "fs";
-import { Task } from "../model/task";
-import { parseTaskFile, serializeTask } from "../utils/markdown";
-import { generateId } from "../utils/uuid";
-
-export class TaskStore {
-	private fileExtension: string;
-
-	constructor() {
-		const config = vscode.workspace.getConfiguration("projectTasks");
-		this.fileExtension = config.get<string>("fileExtension") ?? ".task.md";
-	}
-
-	getProjectTaskPath(): string | undefined {
-		const workspaceRoot = vscode.workspace.workspaceFolders?.[0]?.uri.fsPath;
-		if (!workspaceRoot) return undefined;
-
-		const config = vscode.workspace.getConfiguration("projectTasks");
-		const relativePath = config.get<string>("projectPath") ?? ".vscode/tasks";
-		return path.join(workspaceRoot, relativePath);
-	}
-
-	getGlobalTaskPath(): string | undefined {
-		const config = vscode.workspace.getConfiguration("projectTasks");
-		const globalPath = config.get<string>("globalPath");
-		return globalPath || undefined;
-	}
-
-	async listTasks(folderPath: string): Promise<Task[]> {
-		try {
-			await fs.promises.mkdir(folderPath, { recursive: true });
-		} catch {
-			return [];
-		}
-
-		const entries = await fs.promises.readdir(folderPath, {
-			withFileTypes: true,
-		});
-		const files = entries.filter(
-			(e) => e.isFile() && e.name.endsWith(this.fileExtension),
-		);
-
-		const tasks: Task[] = [];
-		for (const file of files) {
-			try {
-				const content = await fs.promises.readFile(
-					path.join(folderPath, file.name),
-					"utf-8",
-				);
-				tasks.push(parseTaskFile(content));
-			} catch (err) {
-				console.error(`Failed to parse task file ${file.name}:`, err);
-			}
-		}
-
-		return tasks.sort(
-			(a, b) => new Date(b.updated).getTime() - new Date(a.updated).getTime(),
-		);
-	}
-
-	async getTask(folderPath: string, taskId: string): Promise<Task | undefined> {
-		const tasks = await this.listTasks(folderPath);
-		return tasks.find((t) => t.id === taskId);
-	}
-
-	async createTask(
-		folderPath: string,
-		task: Omit<Task, "id" | "created" | "updated">,
-	): Promise<Task> {
-		const now = new Date().toISOString();
-		const newTask: Task = {
-			...task,
-			id: generateId(),
-			created: now,
-			updated: now,
-		};
-
-		await fs.promises.mkdir(folderPath, { recursive: true });
-		const filePath = this.taskFilePath(folderPath, newTask);
-		await fs.promises.writeFile(filePath, serializeTask(newTask), "utf-8");
-
-		return newTask;
-	}
-
-	async updateTask(folderPath: string, task: Task): Promise<void> {
-		const updatedTask = { ...task, updated: new Date().toISOString() };
-		const filePath = this.taskFilePath(folderPath, updatedTask);
-		await fs.promises.writeFile(filePath, serializeTask(updatedTask), "utf-8");
-	}
-
-	async deleteTask(folderPath: string, taskId: string): Promise<void> {
-		const task = await this.getTask(folderPath, taskId);
-		if (!task) return;
-
-		const filePath = this.taskFilePath(folderPath, task);
-		try {
-			await fs.promises.unlink(filePath);
-		} catch (err) {
-			console.error(`Failed to delete task file:`, err);
-		}
-	}
-
-	private taskFilePath(folderPath: string, task: Task): string {
-		const safeName = task.title
-			.toLowerCase()
-			.replace(/[^a-z0-9\u0400-\u04FF]+/g, "-")
-			.replace(/^-|-$/g, "")
-			.slice(0, 80);
-
-		return path.join(folderPath, `${safeName}${this.fileExtension}`);
-	}
-}
diff --git a/src/utils/markdown.test.ts b/src/utils/markdown.test.ts
new file mode 100644
index 0000000..abfd473
--- /dev/null
+++ b/src/utils/markdown.test.ts
@@ -0,0 +1,81 @@
+import { describe, it, expect } from "vitest";
+import { parseTaskFile, serializeTask } from "./markdown";
+import { Task } from "@/model/task";
+
+const fullTask: Task = {
+	id: "550e8400-e29b-41d4-a716-446655440000",
+	title: "Пофиксить баг логина",
+	description: "Ошибка валидации токена",
+	status: "in-progress",
+	priority: "high",
+	tags: ["bug", "frontend"],
+	assignee: "ivanov",
+	created: "2026-07-12T10:00:00.000Z",
+	updated: "2026-07-12T10:00:00.000Z",
+};
+
+describe("markdown", () => {
+	it("parses a .task.md file with full frontmatter", () => {
+		const content = [
+			"---",
+			'id: "550e8400-e29b-41d4-a716-446655440000"',
+			'title: "Пофиксить баг логина"',
+			"status: in-progress",
+			"priority: high",
+			"tags: [bug, frontend]",
+			'assignee: "ivanov"',
+			"created: 2026-07-12T10:00:00.000Z",
+			"updated: 2026-07-12T10:00:00.000Z",
+			"---",
+			"Ошибка валидации токена",
+		].join("\n");
+
+		const task = parseTaskFile(content);
+		expect(task).toEqual(fullTask);
+	});
+
+	it("fills defaults for missing fields", () => {
+		const content = [
+			"---",
+			'id: "abc"',
+			'title: "Minimal"',
+			"---",
+			"",
+		].join("\n");
+
+		const task = parseTaskFile(content);
+		expect(task.id).toBe("abc");
+		expect(task.title).toBe("Minimal");
+		expect(task.description).toBe("");
+		expect(task.status).toBe("todo");
+		expect(task.priority).toBe("medium");
+		expect(task.tags).toEqual([]);
+		expect(task.assignee).toBe("");
+		expect(task.created).toBeTruthy();
+		expect(task.updated).toBeTruthy();
+	});
+
+	it("serializeTask produces valid frontmatter", () => {
+		const result = serializeTask(fullTask);
+		expect(result).toContain("---");
+		expect(result).toContain("title: Пофиксить баг логина");
+		expect(result).toContain("status: in-progress");
+		expect(result).toContain("Ошибка валидации токена");
+	});
+
+	it("round-trip: serialize → parse produces the same task", () => {
+		const serialized = serializeTask(fullTask);
+		const parsed = parseTaskFile(serialized);
+		expect(parsed).toEqual(fullTask);
+	});
+
+	it("description with utf-8 survives round-trip", () => {
+		const task: Task = {
+			...fullTask,
+			description: "Тестовая задача с кириллицей\nи переносом строки",
+		};
+		const serialized = serializeTask(task);
+		const parsed = parseTaskFile(serialized);
+		expect(parsed.description).toBe(task.description);
+	});
+});
diff --git a/src/utils/markdown.ts b/src/utils/markdown.ts
index 1dc6895..475f112 100644
--- a/src/utils/markdown.ts
+++ b/src/utils/markdown.ts
@@ -1,5 +1,11 @@
 import matter from "gray-matter";
-import { Task } from "../model/task";
+import { Task } from "@/model/task";
+
+function toISO(value: unknown): string {
+	if (value instanceof Date) return value.toISOString();
+	if (typeof value === "string") return value;
+	return new Date().toISOString();
+}
 
 export function parseTaskFile(content: string): Task {
 	const parsed = matter(content);
@@ -11,8 +17,8 @@ export function parseTaskFile(content: string): Task {
 		priority: parsed.data.priority ?? "medium",
 		tags: parsed.data.tags ?? [],
 		assignee: parsed.data.assignee ?? "",
-		created: parsed.data.created ?? new Date().toISOString(),
-		updated: parsed.data.updated ?? new Date().toISOString(),
+		created: toISO(parsed.data.created),
+		updated: toISO(parsed.data.updated),
 	};
 }
 
diff --git a/src/views/taskTreeProvider.ts b/src/views/taskTreeProvider.ts
index d13185c..4ab077e 100644
--- a/src/views/taskTreeProvider.ts
+++ b/src/views/taskTreeProvider.ts
@@ -1,7 +1,6 @@
 import * as vscode from "vscode";
-import { Task, TaskStatus } from "../model/task";
-import { TaskStore } from "../storage/taskStore";
-import { ConfigStore } from "../storage/configStore";
+import { Task, TaskStatus } from "@/model/task";
+import { IConfigProvider, ITaskRepository } from "@/ports";
 
 const STATUS_ORDER: TaskStatus[] = ["todo", "in-progress", "done", "cancelled"];
 
@@ -30,8 +29,10 @@ export class TaskTreeProvider implements vscode.TreeDataProvider<vscode.TreeItem
 	>();
 	readonly onDidChangeTreeData = this._onDidChangeTreeData.event;
 
-	private taskStore = new TaskStore();
-	private configStore = new ConfigStore();
+	constructor(
+		private taskStore: ITaskRepository,
+		private configStore: IConfigProvider,
+	) {}
 
 	refresh(): void {
 		this._onDidChangeTreeData.fire();
@@ -54,7 +55,7 @@ export class TaskTreeProvider implements vscode.TreeDataProvider<vscode.TreeItem
 			return [new vscode.TreeItem("Open a workspace folder to start")];
 		}
 
-		const tasks = await this.taskStore.listTasks(projectPath);
+		const tasks = await this.taskStore.list(projectPath);
 
 		return STATUS_ORDER.map((status) => {
 			const groupTasks = tasks.filter((t) => t.status === status);
diff --git a/tests/helpers/InMemoryFileSystem.ts b/tests/helpers/InMemoryFileSystem.ts
new file mode 100644
index 0000000..f6eae98
--- /dev/null
+++ b/tests/helpers/InMemoryFileSystem.ts
@@ -0,0 +1,42 @@
+import { IFileSystem } from "@/ports";
+
+export class InMemoryFileSystem implements IFileSystem {
+	private files = new Map<string, string>();
+
+	reset(): void {
+		this.files.clear();
+	}
+
+	async readFile(path: string): Promise<string> {
+		const content = this.files.get(path);
+		if (content === undefined) {
+			throw new Error(`ENOENT: no such file: ${path}`);
+		}
+		return content;
+	}
+
+	async writeFile(path: string, content: string): Promise<void> {
+		this.files.set(path, content);
+	}
+
+	async deleteFile(path: string): Promise<void> {
+		this.files.delete(path);
+	}
+
+	async readdir(path: string): Promise<string[]> {
+		const prefix = path.endsWith("/") || path.endsWith("\\") ? path : path + "/";
+		const seen = new Set<string>();
+		for (const key of this.files.keys()) {
+			if (key.startsWith(prefix)) {
+				const relative = key.slice(prefix.length);
+				const top = relative.split(/[/\\]/)[0];
+				if (top) seen.add(top);
+			}
+		}
+		return [...seen];
+	}
+
+	async mkdir(_path: string): Promise<void> {
+		// no-op for in-memory
+	}
+}
diff --git a/tests/storage/FsTaskRepository.test.ts b/tests/storage/FsTaskRepository.test.ts
new file mode 100644
index 0000000..b749c76
--- /dev/null
+++ b/tests/storage/FsTaskRepository.test.ts
@@ -0,0 +1,119 @@
+import { describe, it, expect, beforeEach } from "vitest";
+import { FsTaskRepository } from "@/storage/FsTaskRepository";
+import { InMemoryFileSystem } from "../helpers/InMemoryFileSystem";
+import { ITaskRepository } from "@/ports";
+import { Task } from "@/model/task";
+
+describe("FsTaskRepository", () => {
+	let fs: InMemoryFileSystem;
+	let repo: ITaskRepository;
+
+	const folder = "/tasks";
+
+	const sampleTask = {
+		title: "Fix login bug",
+		description: "Token validation error",
+		status: "todo" as const,
+		priority: "high" as const,
+		tags: ["bug", "frontend"],
+		assignee: "ivanov",
+	};
+
+	beforeEach(() => {
+		fs = new InMemoryFileSystem();
+		repo = new FsTaskRepository(fs, ".task.md");
+	});
+
+	it("creates a task and writes it as a .task.md file", async () => {
+		const task = await repo.create(folder, sampleTask);
+
+		expect(task.id).toBeTruthy();
+		expect(task.title).toBe("Fix login bug");
+		expect(task.created).toBeTruthy();
+		expect(task.updated).toBe(task.created);
+
+		const files = await fs.readdir(folder);
+		expect(files).toHaveLength(1);
+		expect(files[0]).toMatch(/\.task\.md$/);
+
+		const content = await fs.readFile(`${folder}/${files[0]}`);
+		expect(content).toContain("Fix login bug");
+		expect(content).toContain("status: todo");
+	});
+
+	it("list returns created tasks sorted by updated desc", async () => {
+		const a = await repo.create(folder, { ...sampleTask, title: "A" });
+		await delay(10);
+		const b = await repo.create(folder, { ...sampleTask, title: "B" });
+
+		const tasks = await repo.list(folder);
+		expect(tasks).toHaveLength(2);
+		expect(tasks[0].title).toBe("B");
+		expect(tasks[1].title).toBe("A");
+	});
+
+	it("getById returns the correct task", async () => {
+		const created = await repo.create(folder, sampleTask);
+		const found = await repo.getById(folder, created.id);
+		expect(found).toEqual(created);
+	});
+
+	it("getById returns undefined for unknown id", async () => {
+		const found = await repo.getById(folder, "nonexistent");
+		expect(found).toBeUndefined();
+	});
+
+	it("update modifies the file and updates timestamp", async () => {
+		const task = await repo.create(folder, sampleTask);
+		await delay(5);
+		const updated: Task = { ...task, title: "Fixed!", status: "done" };
+
+		await repo.update(folder, updated);
+		const found = await repo.getById(folder, task.id);
+
+		expect(found!.title).toBe("Fixed!");
+		expect(found!.status).toBe("done");
+		expect(new Date(found!.updated).getTime()).toBeGreaterThan(
+			new Date(task.updated).getTime(),
+		);
+	});
+
+	it("delete removes the task file", async () => {
+		const task = await repo.create(folder, sampleTask);
+		await repo.delete(folder, task.id);
+
+		const tasks = await repo.list(folder);
+		expect(tasks).toHaveLength(0);
+	});
+
+	it("delete is a no-op for unknown id", async () => {
+		await expect(repo.delete(folder, "nope")).resolves.toBeUndefined();
+	});
+
+	it("list returns empty array for non-existent folder", async () => {
+		const tasks = await repo.list("/nonexistent");
+		expect(tasks).toEqual([]);
+	});
+
+	it("filters files by extension", async () => {
+		fs.writeFile(`${folder}/notes.txt`, "hello");
+		fs.writeFile(`${folder}/chore.md`, "---\nid: x\n---\n");
+
+		await repo.create(folder, sampleTask);
+
+		const tasks = await repo.list(folder);
+		expect(tasks).toHaveLength(1);
+	});
+
+	it("skips unparseable .task.md files silently", async () => {
+		fs.writeFile(`${folder}/corrupt.task.md`, "not valid frontmatter");
+
+		await repo.create(folder, sampleTask);
+		const tasks = await repo.list(folder);
+		expect(tasks).toHaveLength(1);
+	});
+});
+
+function delay(ms: number): Promise<void> {
+	return new Promise((r) => setTimeout(r, ms));
+}
diff --git a/tests/tsconfig.json b/tests/tsconfig.json
new file mode 100644
index 0000000..9169110
--- /dev/null
+++ b/tests/tsconfig.json
@@ -0,0 +1,8 @@
+{
+	"extends": "../tsconfig.json",
+	"include": ["**/*", "../src/**/*"],
+	"compilerOptions": {
+		"noEmit": true,
+		"rootDir": ".."
+	}
+}
diff --git a/tsconfig.json b/tsconfig.json
index 552c1db..7918758 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -12,7 +12,10 @@
 		"forceConsistentCasingInFileNames": true,
 		"resolveJsonModule": true,
 		"declaration": true,
-		"types": ["node"]
+		"types": ["node"],
+		"paths": {
+			"@/*": ["./src/*"]
+		}
 	},
 	"include": ["src/**/*"],
 	"exclude": ["node_modules", "out", ".vscode-test"]
diff --git a/vite.config.ts b/vite.config.ts
new file mode 100644
index 0000000..3db4453
--- /dev/null
+++ b/vite.config.ts
@@ -0,0 +1,30 @@
+import path from "path";
+import { builtinModules } from "node:module";
+import { defineConfig } from "vite";
+
+export default defineConfig({
+	build: {
+		target: "node20",
+		ssr: path.resolve(__dirname, "src/extension.ts"),
+		outDir: "out",
+		sourcemap: true,
+		rollupOptions: {
+			output: {
+				entryFileNames: "extension.js",
+			},
+			external: [
+				"vscode",
+				...builtinModules,
+				...builtinModules.map((m) => `node:${m}`),
+			],
+		},
+	},
+	ssr: {
+		noExternal: true,
+	},
+	resolve: {
+		alias: {
+			"@": path.resolve(__dirname, "src"),
+		},
+	},
+});
diff --git a/vitest.config.ts b/vitest.config.ts
new file mode 100644
index 0000000..61f77c1
--- /dev/null
+++ b/vitest.config.ts
@@ -0,0 +1,15 @@
+import { defineConfig } from "vitest/config";
+import path from "path";
+
+export default defineConfig({
+	test: {
+		include: ["src/**/*.test.ts", "tests/**/*.test.ts"],
+		exclude: ["node_modules", "out"],
+		environment: "node",
+	},
+	resolve: {
+		alias: {
+			"@": path.resolve(__dirname, "src"),
+		},
+	},
+});