added unit tests for buffers.skip

lib/buffers.js

@@ -7,7 +7,7 @@ Buffers.prototype.skip = function(i) {
     return;
   }
 
-  if (i === this.length) {
+  if (i >= this.length) {
     this.buffers = [];
     this.length = 0;
     return;

test/buffers.js

@@ -0,0 +1,63 @@
+'use strict';
+
+var chai = require('chai');
+var should = chai.should();
+var Buffers = require('../lib/buffers');
+
+describe('Buffers', function() {
+
+  var buffs = function buffs() {
+    var b = new Buffers();
+    b.push(new Buffer('0123', 'hex'));
+    b.push(new Buffer('4567', 'hex'));
+    b.push(new Buffer('89ab', 'hex'));
+    b.push(new Buffer('cdef', 'hex'));
+    return b;
+  };
+
+  it('set buffers to empty if "i" is greater than the total length', function() {
+    var b = buffs();
+    b.length.should.equal(8);
+    b.skip(100);
+    b.buffers.should.deep.equal([]);
+    b.length.should.equal(0);
+  });
+
+  it('set buffers to empty if "i" is equal than the total length', function() {
+    var b = buffs();
+    b.length.should.equal(8);
+    b.skip(8);
+    b.buffers.should.deep.equal([]);
+    b.length.should.equal(0);
+  });
+
+  it('do not skip if "i" is zero', function() {
+    var b = buffs();
+    b.skip(0);
+    b.length.should.equal(8);
+  });
+
+  it('remove part of the first buffer', function() {
+    var b = buffs();
+    b.skip(1);
+    b.length.should.equal(7);
+    b.buffers[0].should.deep.equal(new Buffer('23', 'hex'));
+  });
+
+  it('remove the first three buffers', function() {
+    var b = buffs();
+    b.skip(6);
+    b.length.should.equal(2);
+    should.not.exist(b.buffers[1]);
+    should.not.exist(b.buffers[2]);
+    should.not.exist(b.buffers[3]);
+  });
+
+  it('remove part of the fourth buffer', function() {
+    var b = buffs();
+    b.skip(7);
+    b.length.should.equal(1);
+    b.buffers[0].should.deep.equal(new Buffer('ef', 'hex'));
+  });
+
+});