adding some tests

packages/just-task-preset/jest.config.js

@@ -0,0 +1,6 @@
+module.exports = {
+  roots: ['<rootDir>/src'],
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+  testMatch: ['**/?(*.)+(spec|test).(j|t)s?(x)']
+};

packages/just-task-preset/package.json

@@ -5,7 +5,8 @@
   "main": "lib/index.js",
   "scripts": {
     "build": "tsc",
-    "dev": "tsc -w --preserveWatchOutput"
+    "dev": "tsc -w --preserveWatchOutput",
+    "test": "jest"
   },
   "dependencies": {
     "chalk": "^2.4.1",
@@ -29,6 +30,7 @@
     "@types/run-parallel-limit": "^1.0.0",
     "@types/semver": "^5.5.0",
     "@types/webpack": "^4.4.20",
+    "@types/jest": "^23.3.10",
     "typescript": ">=2.8.0 <4.0.0",
     "jest": ">=22.0.0"
   },

packages/just-task-preset/src/__tests__/exec.spec.ts

@@ -0,0 +1,18 @@
+import { encodeArgs } from '../exec';
+
+describe('encodeArgs', () => {
+  it('encodes things with spaces with double quotes', () => {
+    const args = encodeArgs(['blah blah']);
+    expect(args[0]).toBe('"blah blah"');
+  });
+
+  it('encodes Windows-like paths', () => {
+    const args = encodeArgs(['C:\\Program Files\\node\\bin\\node.exe']);
+    expect(args[0]).toBe('"C:\\Program Files\\node\\bin\\node.exe"');
+  });
+
+  it('leaves normal args alone', () => {
+    const args = encodeArgs(['this-is-normal']);
+    expect(args[0]).toBe('this-is-normal');
+  });
+});