diff --git a/lib/bcoin/env.js b/lib/bcoin/env.js
index af184939..ac638874 100644
--- a/lib/bcoin/env.js
+++ b/lib/bcoin/env.js
@@ -42,6 +42,11 @@ function Environment(options) {
     || options.prefix
     || process.env.HOME + '/.bcoin';
 
+  this.db = options.db;
+
+  if (process.env.BCOIN_DB != null)
+    this.db = process.env.BCOIN_DB;
+
   this.debugLogs = options.debug;
 
   if (process.env.BCOIN_DEBUG != null)
diff --git a/lib/bcoin/ldb.js b/lib/bcoin/ldb.js
index 236a7470..c6287c47 100644
--- a/lib/bcoin/ldb.js
+++ b/lib/bcoin/ldb.js
@@ -5,13 +5,12 @@
  * https://github.com/indutny/bcoin
  */
 
-var db = {};
-
 module.exports = function(bcoin) {
 
 var EventEmitter = require('events').EventEmitter;
 var utils = bcoin.utils;
 var network = bcoin.protocol.network;
+var db = {};
 
 /**
  * LDB
@@ -55,15 +54,18 @@ function ldb(options) {
 function getLocation(options) {
   if (options.location)
     return options.location;
-  return bcoin.prefix + '/' + options.name + '-' + network.type + '.db';
+
+  return bcoin.prefix
+    + '/'
+    + options.name
+    + '-'
+    + network.type
+    + '.db';
 }
 
 function getBackend(backend) {
-  if (bcoin.isBrowser)
-    return require('level-js');
-
   if (typeof backend !== 'string')
-    backend = process.env.BCOIN_DB;
+    backend = bcoin.db;
 
   if (!backend || backend === 'leveldb')
     backend = 'leveldown';
@@ -77,6 +79,9 @@ function getBackend(backend) {
   if (backend === 'bst')
     return require('./bst');
 
+  if (bcoin.isBrowser)
+    return require('level-js');
+
   bcoin.ensurePrefix();
 
   return require(backend);
diff --git a/package.json b/package.json
index b0e8b92c..33748fb5 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,7 @@
   "bin": "./bin/node",
   "preferGlobal": false,
   "scripts": {
-    "test": "rm -rf ~/.bcoin-test && BCOIN_PREFIX=~/.bcoin-test mocha --reporter spec test/*-test.js"
+    "test": "mocha --reporter spec test/*-test.js"
   },
   "repository": "git://github.com/bcoin-org/bcoin.git",
   "keywords": [
diff --git a/test/node-test.js b/test/node-test.js
index e5d7f5f8..9a3ac59e 100644
--- a/test/node-test.js
+++ b/test/node-test.js
@@ -1,12 +1,11 @@
 var bn = require('bn.js');
-var bcoin = require('../')();
+var bcoin = require('../')({ db: 'memory' });
 var constants = bcoin.protocol.constants;
 var utils = bcoin.utils;
 var assert = utils.assert;
 var opcodes = constants.opcodes;
 
 describe('Wallet', function() {
-  process.env.BCOIN_DB = 'bst';
   var node = new bcoin.fullnode();
   node.on('error', function() {});
 
@@ -15,7 +14,6 @@ describe('Wallet', function() {
   });
 
   it('should have wallet', function(cb) {
-    delete process.env.BCOIN_DB;
     node.getWallet('primary', function(err, wallet) {
       if (err)
         return cb(err);
diff --git a/test/wallet-test.js b/test/wallet-test.js
index 98bfdd10..b7eda7d1 100644
--- a/test/wallet-test.js
+++ b/test/wallet-test.js
@@ -1,5 +1,5 @@
 var bn = require('bn.js');
-var bcoin = require('../')();
+var bcoin = require('../')({ db: 'memory' });
 var constants = bcoin.protocol.constants;
 var utils = bcoin.utils;
 var assert = utils.assert;
@@ -24,8 +24,11 @@ var dummyInput = {
 };
 
 describe('Wallet', function() {
-  var wdb = new bcoin.walletdb();
-  wdb.tx.options.verify = true;
+  var wdb = new bcoin.walletdb({ verify: true });
+
+  it('should open walletdb', function(cb) {
+    wdb.open(cb);
+  });
 
   it('should generate new key and address', function() {
     var w = bcoin.wallet();