fixed outpoint bug and added first test

lib/primitives/outpoint.js

@@ -69,7 +69,7 @@ Outpoint.fromOptions = function fromOptions(options) {
 
 Outpoint.prototype.clone = function clone() {
   const outpoint = new Outpoint();
-  outpoint.hash = this.value;
+  outpoint.hash = this.hash;
   outpoint.index = this.index;
   return outpoint;
 };

test/outpoint-test.js

@@ -0,0 +1,26 @@
+/* eslint-env mocha */
+
+'use strict';
+
+const Outpoint = require('../lib/primitives/outpoint');
+const assert = require('./util/assert');
+const common = require('./util/common');
+
+const OUTPOINT_SIZE = 36;
+const tx1 = common.readTX('tx1').getRaw();
+const rawOutpoint1 = tx1.slice(5, 5+OUTPOINT_SIZE);
+
+const tx2 = common.readTX('tx2').getRaw();
+const rawOutpoint2 = tx2.slice(5, 5+OUTPOINT_SIZE);
+
+describe('Outpoint', () => {
+  it('should clone the outpoint correctly', () => {
+    const raw = rawOutpoint1.slice();
+    const outpointObject = Outpoint.fromRaw(raw);
+    const clone = outpointObject.clone();
+    const equals = outpointObject.equals(clone);
+
+    assert.strictEqual(outpointObject !== clone, true);
+    assert.strictEqual(equals, true);
+  });
+});