tests: add type tests

test/types.js

@@ -0,0 +1,14 @@
+/* global describe, it */
+
+var assert = require('assert')
+var types = require('../src/types')
+
+describe('types', function () {
+  describe('ECCurve/ECPoint/BigInt', function () {
+    it('return true for duck types', function () {
+      assert(types.quacksLike('BigInteger', function BigInteger () {}))
+      assert(types.quacksLike('Curve', function Curve () {}))
+      assert(types.quacksLike('Point', function Point () {}))
+    })
+  })
+})