[Tests] add nyc

.eslintrc

@@ -3,6 +3,8 @@
 
 	"extends": "@ljharb/eslint-config/node/6",
 
+	"ignorePatterns": ["coverage"],
+
 	"rules": {
 		"array-bracket-newline": 0,
 	},

.nycrc

@@ -0,0 +1,9 @@
+{
+	"all": true,
+	"check-coverage": false,
+	"reporter": ["text-summary", "text", "html", "json"],
+	"exclude": [
+		"coverage",
+		"test"
+	]
+}

package.json

@@ -8,7 +8,7 @@
 		"prepublishOnly": "safe-publish-latest",
 		"pretest": "npm run lint",
 		"lint": "eslint --ext=js,mjs .",
-		"tests-only": "tape test",
+		"tests-only": "nyc tape 'test/**/*.js'",
 		"test": "npm run tests-only",
 		"posttest": "npx aud --production",
 		"version": "auto-changelog && git add CHANGELOG.md",
@@ -47,6 +47,7 @@
 		"@ljharb/eslint-config": "^20.0.0",
 		"auto-changelog": "^2.3.0",
 		"eslint": "^8.4.1",
+		"nyc": "^14.1.1",
 		"safe-publish-latest": "^2.0.0",
 		"tape": "^5.3.2"
 	},