diff --git a/package-lock.json b/package-lock.json
index 5965453..3962a94 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,62 @@
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@@ -67,12 +155,80 @@
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@@ -87,6 +243,18 @@
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+      "integrity": "sha1-6PvzdNxVb/iUehDcsFctYz8s+hA=",
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@@ -158,12 +389,96 @@
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+        "@istanbuljs/schema": "^0.1.2",
+        "glob": "^7.1.4",
+        "minimatch": "^3.0.4"
+      }
+    },
+    "v8-to-istanbul": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/v8-to-istanbul/-/v8-to-istanbul-5.0.1.tgz",
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+        "convert-source-map": "^1.6.0",
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+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
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+        "string-width": "^4.1.0",
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       "dev": true
+    },
+    "y18n": {
+      "version": "5.0.2",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.2.tgz",
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+      "dev": true
+    },
+    "yargs": {
+      "version": "16.0.3",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-16.0.3.tgz",
+      "integrity": "sha512-6+nLw8xa9uK1BOEOykaiYAJVh6/CjxWXK/q9b5FpRgNslt8s22F2xMBqVIKgCRjNgGvGPBy8Vog7WN7yh4amtA==",
+      "dev": true,
+      "requires": {
+        "cliui": "^7.0.0",
+        "escalade": "^3.0.2",
+        "get-caller-file": "^2.0.5",
+        "require-directory": "^2.1.1",
+        "string-width": "^4.2.0",
+        "y18n": "^5.0.1",
+        "yargs-parser": "^20.0.0"
+      }
+    },
+    "yargs-parser": {
+      "version": "20.2.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.2.1.tgz",
+      "integrity": "sha512-yYsjuSkjbLMBp16eaOt7/siKTjNVjMm3SoJnIg3sEh/JsvqVVDyjRKmaJV4cl+lNIgq6QEco2i3gDebJl7/vLA==",
+      "dev": true
     }
   }
 }
diff --git a/package.json b/package.json
index e0bae80..636b135 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,9 @@
   "description": "Generic JavaScript types and type extensions...",
   "main": "main.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "c8 node ./test.js",
+    "cover": "c8 -r text -r lcov node ./test.js",
+    "prepublishOnly": "npm test"
   },
   "repository": {
     "type": "git",
@@ -25,6 +27,7 @@
     "object-run": "^1.0.1"
   },
   "devDependencies": {
+    "c8": "*",
     "ig-test": "*",
     "color": "*"
   }