add block.js and tests

test/block.js

@@ -0,0 +1,72 @@
+var assert = require('assert')
+
+var Block = require('../src/block')
+
+var fixtures = require('./fixtures/block')
+
+describe('Block', function() {
+  describe('fromBuffer/fromHex', function() {
+    fixtures.valid.forEach(function(f) {
+      it('imports the block: ' + f.description + ' correctly', function() {
+        var block = Block.fromHex(f.hex)
+
+        assert.equal(block.version, f.version)
+        assert.equal(block.prevHash.toString('hex'), f.prevHash)
+        assert.equal(block.merkleRoot.toString('hex'), f.merkleRoot)
+        assert.equal(block.timestamp, f.timestamp)
+        assert.equal(block.bits, f.bits)
+        assert.equal(block.nonce, f.nonce)
+      })
+    })
+
+    fixtures.invalid.forEach(function(f) {
+      it('throws on ' + f.exception, function() {
+        assert.throws(function() {
+          Block.fromHex(f.hex)
+        }, new RegExp(f.exception))
+      })
+    })
+  })
+
+  describe('toBuffer/toHex', function() {
+    fixtures.valid.forEach(function(f) {
+      var block
+
+      beforeEach(function() {
+        block = Block.fromHex(f.hex)
+      })
+
+      it('exports the block: ' + f.description + ' correctly', function() {
+        assert.equal(block.toHex(), f.hex)
+      })
+    })
+  })
+
+  describe('getHash', function() {
+    fixtures.valid.forEach(function(f) {
+      var block
+
+      beforeEach(function() {
+        block = Block.fromHex(f.hex)
+      })
+
+      it('calculates ' + f.hash + ' for the block: ' + f.description, function() {
+        assert.equal(block.getHash().toString('hex'), f.hash)
+      })
+    })
+  })
+
+  describe('getId', function() {
+    fixtures.valid.forEach(function(f) {
+      var block
+
+      beforeEach(function() {
+        block = Block.fromHex(f.hex)
+      })
+
+      it('calculates ' + f.id + ' for the block: ' + f.description, function() {
+        assert.equal(block.getId(), f.id)
+      })
+    })
+  })
+})