Add tests for fakeBlockChain

Signed-off-by: Sina Mahmoodi <itz.s1na@gmail.com>

tests/api/fakeBlockChain.js

@@ -0,0 +1,36 @@
+const tape = require('tape')
+const fakeBlockchain = require('../../lib/fakeBlockChain')
+
+tape('fakeBlockChain', (t) => {
+  const blockchain = fakeBlockchain
+
+  t.test('should fail to get block by invalid type', (st) => {
+    blockchain.getBlock(null, (err, block) => {
+      st.ok(err, 'should return error')
+      st.notOk(block)
+      st.end()
+    })
+  })
+
+  t.test('should get block hash by number', (st) => {
+    blockchain.getBlock(1, isValidBlock(st))
+  })
+
+  t.test('should get block hash by buffer', (st) => {
+    blockchain.getBlock(Buffer.from('0x0'), isValidBlock(st))
+  })
+
+  t.test('should "del" block', (st) => {
+    blockchain.delBlock('0x0', (err) => {
+      st.error(err)
+      st.end()
+    })
+  })
+})
+
+const isValidBlock = (st) => (err, block) => {
+  st.notOk(err)
+  st.ok(block, 'should return non-empty value')
+  st.ok(Buffer.isBuffer(block.hash()), 'block hash should of type buffer')
+  st.end()
+}