diff --git a/package.json b/package.json
index 3706dd1..0b6f336 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,8 @@
 	"scripts": {
 		"lint": "eslint .",
 		"pretest": "npm run lint",
-		"test": "echo \"Error: no test specified\" && exit 1"
+		"tests-only": "node test",
+		"test": "npm run tests-only"
 	},
 	"repository": {
 		"type": "git",
@@ -35,6 +36,9 @@
 	},
 	"devDependencies": {
 		"@ljharb/eslint-config": "^14.0.2",
-		"eslint": "^6.1.0"
+		"eslint": "^6.1.0",
+		"has-symbols": "^1.0.0",
+		"object-inspect": "^1.6.0",
+		"tape": "^4.11.0"
 	}
 }
diff --git a/test/index.js b/test/index.js
new file mode 100644
index 0000000..f9ea998
--- /dev/null
+++ b/test/index.js
@@ -0,0 +1,66 @@
+'use strict';
+
+var test = require('tape');
+var inspect = require('object-inspect');
+var whichBoxedPrimitive = require('..');
+
+var debug = function (v, m) { return inspect(v) + ' ' + m; };
+
+var forEach = function (arr, func) {
+	var i;
+	for (i = 0; i < arr.length; ++i) {
+		func(arr[i], i, arr);
+	}
+};
+
+var hasSymbols = require('has-symbols')();
+var hasBigInts = typeof BigInt === 'function';
+
+var primitives = [
+	true,
+	false,
+	42,
+	NaN,
+	Infinity,
+	'',
+	'foo'
+].concat(
+	hasSymbols ? [Symbol(), Symbol.iterator] : [],
+	hasBigInts ? BigInt(42) : []
+);
+
+var objects = [
+	/a/g,
+	new Date(),
+	function () {},
+	[],
+	{}
+];
+
+test('isBoxedPrimitive', function (t) {
+	t.test('unboxed primitives', function (st) {
+		forEach([null, undefined].concat(primitives), function (primitive) {
+			st.equal(null, whichBoxedPrimitive(primitive), debug(primitive, 'is a primitive, but not a boxed primitive'));
+		});
+		st.end();
+	});
+
+	t.test('boxed primitives', function (st) {
+		forEach(primitives, function (primitive) {
+			var boxed = Object(primitive);
+			var expected = boxed.constructor.name;
+			st.equal(typeof expected, 'string', 'expected is string');
+			st.equal(whichBoxedPrimitive(boxed), expected, debug(boxed, 'is a boxed primitive: ' + expected));
+		});
+		st.end();
+	});
+
+	t.test('non-primitive objects', function (st) {
+		forEach(objects, function (object) {
+			st.equal(undefined, whichBoxedPrimitive(object), debug(object, 'is not a primitive, boxed or otherwise'));
+		});
+		st.end();
+	});
+
+	t.end();
+});