diff --git a/test/index.js b/test/index.js
new file mode 100644
index 0000000..9d044fd
--- /dev/null
+++ b/test/index.js
@@ -0,0 +1,90 @@
+'use strict';
+
+var flags = require('../');
+var test = require('tape');
+
+var getRegexLiteral = function (stringRegex) {
+	try {
+		/*jshint evil: true */
+		return Function('return ' + stringRegex + ';')();
+		/*jshint evil: false */
+	} catch (e) {}
+};
+
+test('works as a function', function (t) {
+	t.equal(flags(/a/g), 'g', 'flags(/a/g) !== "g"');
+	t.equal(flags(/a/gmi), 'gim', 'flags(/a/gmi) !== "gim"');
+	t.equal(flags(new RegExp('a', 'gmi')), 'gim', 'flags(new RegExp("a", "gmi")) !== "gim"');
+	t.equal(flags(/a/), '', 'flags(/a/) !== ""');
+	t.equal(flags(new RegExp('a')), '', 'flags(new RegExp("a")) !== ""');
+	if (RegExp.prototype.hasOwnProperty('sticky')) {
+		t.equal(flags(getRegexLiteral('/a/y')), 'y', 'flags(/a/y) !== "y"');
+		t.equal(flags(new RegExp('a', 'y')), 'y', 'flags(new RegExp("a", "y")) !== "y"');
+	}
+	if (RegExp.prototype.hasOwnProperty('unicode')) {
+		t.equal(flags(getRegexLiteral('/a/u')), 'u', 'flags(/a/u) !== "u"');
+		t.equal(flags(new RegExp('a', 'u')), 'u', 'flags(new RegExp("a", "u")) !== "u"');
+	}
+
+	t.test('sorting', function (st) {
+		st.equal(flags(/a/gim), 'gim', 'flags(/a/gim) !== "gim"');
+		st.equal(flags(/a/mig), 'gim', 'flags(/a/mig) !== "gim"');
+		st.equal(flags(/a/mgi), 'gim', 'flags(/a/mgi) !== "gim"');
+		if (RegExp.prototype.hasOwnProperty('sticky')) {
+			st.equal(flags(getRegexLiteral('/a/gyim')), 'gimy', 'flags(/a/gyim) !== "gimy"');
+		}
+		if (RegExp.prototype.hasOwnProperty('unicode')) {
+			st.equal(flags(getRegexLiteral('/a/ugmi')), 'gimu', 'flags(/a/ugmi) !== "gimu"');
+		}
+		st.end();
+	});
+
+	t.test('throws properly', function (st) {
+		var nonObjects = ['', false, true, 42, NaN, null, undefined];
+		st.plan(nonObjects.length);
+		nonObjects.forEach(function (nonObject) {
+			st.throws(function () { RegExp.prototype.flags.call(nonObject); }, TypeError);
+		});
+	});
+	t.end();
+});
+
+test('shims properly', function (t) {
+	flags.shim();
+
+	t.equal((/a/g).flags, 'g', '(/a/g).flags !== "g"');
+	t.equal((/a/gmi).flags, 'gim', '(/a/gmi).flags !== "gim"');
+	t.equal(new RegExp('a', 'gmi').flags, 'gim', 'new RegExp("a", "gmi").flags !== "gim"');
+	t.equal((/a/).flags, '', '(/a/).flags !== ""');
+	t.equal(new RegExp('a').flags, '', 'new RegExp("a").flags !== ""');
+	if (RegExp.prototype.hasOwnProperty('sticky')) {
+		t.equal(getRegexLiteral('/a/y').flags, 'y', '(/a/y).flags !== "y"');
+		t.equal(new RegExp('a', 'y').flags, 'y', 'new RegExp("a", "y").flags !== "y"');
+	}
+	if (RegExp.prototype.hasOwnProperty('unicode')) {
+		t.equal(getRegexLiteral('/a/u').flags, 'u', '(/a/u).flags !== "u"');
+		t.equal(new RegExp('a', 'u').flags, 'u', 'new RegExp("a", "u").flags !== "u"');
+	}
+
+	t.test('sorting', function (st) {
+		st.equal((/a/gim).flags, 'gim', '(/a/gim).flags !== "gim"');
+		st.equal((/a/mig).flags, 'gim', '(/a/mig).flags !== "gim"');
+		st.equal((/a/mgi).flags, 'gim', '(/a/mgi).flags !== "gim"');
+		if (RegExp.prototype.hasOwnProperty('sticky')) {
+			st.equal(getRegexLiteral('/a/gyim').flags, 'gimy', '(/a/gyim).flags !== "gimy"');
+		}
+		if (RegExp.prototype.hasOwnProperty('unicode')) {
+			st.equal(getRegexLiteral('/a/ugmi').flags, 'gimu', '(/a/ugmi).flags !== "gimu"');
+		}
+		st.end();
+	});
+
+	t.test('throws properly', function (st) {
+		var nonObjects = ['', false, true, 42, NaN, null, undefined];
+		st.plan(nonObjects.length);
+		nonObjects.forEach(function (nonObject) {
+			st.throws(function () { RegExp.prototype.flags.call(nonObject); }, TypeError);
+		});
+	});
+	t.end();
+});