tests: add cli unit tests (#719)

config/vitest.ts

@@ -0,0 +1,16 @@
+// config/vitest.ts
+// The vitest configuration file.
+
+import { env } from 'node:process';
+import { defineConfig } from 'vitest/config';
+
+// Make sure the output of the CLI is in color, so that it matches the
+// snapshots.
+env.FORCE_COLOR = 2;
+
+export default defineConfig({
+  test: {
+    // Collect coverage using C8.
+    coverage: { enabled: true },
+  },
+});

package.json

@@ -25,7 +25,9 @@
     "start": "node ./build/main.js",
     "compile": "tsup ./source/main.ts",
     "test:tsc": "tsc --project tsconfig.json",
-    "test": "pnpm test:tsc",
+    "test:unit": "vitest run --config config/vitest.ts",
+    "test:watch": "vitest watch --config config/vitest.ts",
+    "test": "pnpm test:tsc && pnpm test:unit",
     "lint:code": "eslint --max-warnings 0 source/**/*.ts",
     "lint:style": "prettier --check --ignore-path .gitignore .",
     "lint": "pnpm lint:code && pnpm lint:style",
@@ -37,6 +39,7 @@
     "ajv": "8.11.0",
     "arg": "5.0.2",
     "boxen": "7.0.0",
+    "c8": "7.11.3",
     "chalk": "5.0.1",
     "chalk-template": "0.4.0",
     "clipboardy": "3.0.0",
@@ -50,12 +53,14 @@
     "@types/serve-handler": "6.1.1",
     "@vercel/style-guide": "3.0.0",
     "eslint": "8.19.0",
+    "got": "12.1.0",
     "husky": "8.0.1",
     "lint-staged": "13.0.3",
     "prettier": "2.7.1",
     "tsup": "6.1.3",
     "tsx": "3.7.1",
-    "typescript": "4.6.4"
+    "typescript": "4.6.4",
+    "vitest": "0.18.0"
   },
   "tsup": {
     "target": "esnext",
@@ -79,7 +84,8 @@
       "prettier --ignore-unknown --write"
     ],
     "source/**/*.ts": [
-      "eslint --max-warnings 0 --fix"
+      "eslint --max-warnings 0 --fix",
+      "vitest related --run"
     ]
   }
 }