diff --git a/.nycrc b/.nycrc
new file mode 100644
index 0000000..eacd6bd
--- /dev/null
+++ b/.nycrc
@@ -0,0 +1,11 @@
+{
+  "include": [
+    "src/**/*.js"
+  ],
+  "exclude": [
+    "src/**/__test__/*.js"
+  ],
+  "cache": true,
+  "all": true
+}
+
diff --git a/README.md b/README.md
index d00837c..7cb4331 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,7 @@ It is a lib to run [Gun](http://gun.js.org) host in Node.js
 
 1. [Install](#install)
 2. [Usage](#usage)
+3. [Development](#development)
 
 # Install
 ```
@@ -132,3 +133,16 @@ root: {
   }
 }
 ```
+# Development
+## Install libs
+```
+npm install -g eslint eslint-config-google nyc 
+```
+## Test
+```
+npm run rest
+```
+## Run examples
+```
+node examples/usage.js
+```
diff --git a/package.json b/package.json
index 2af42be..2670369 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,7 @@
   },
   "scripts": {
     "start": "node bootstrap.js",
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "nyc ./node_modules/mocha/bin/mocha"
   },
   "repository": {
     "type": "git",
@@ -27,5 +27,10 @@
     "hapi": "16.6.2",
     "lodash": "4.17.5",
     "pem": "1.12.3"
+  },
+  "devDependencies": {
+    "expect.js": "0.3.1",
+    "mocha": "5.0.1",
+    "nyc": "11.4.1"
   }
 }
diff --git a/src/__test__/gun-host.js b/src/__test__/gun-host.js
new file mode 100644
index 0000000..e62ec88
--- /dev/null
+++ b/src/__test__/gun-host.js
@@ -0,0 +1,69 @@
+const {describe, it} = require('mocha');
+const expect = require('expect.js');
+
+const GunHost = require('../gun-host');
+
+describe('Gun', function() {
+  const cluster = {
+    enabled: true,
+    name: '_test_gun',
+    priority_for_master: 0,
+    absent_time_for_delete: 86400,
+    absent_time: 15,
+    loop_delay: 5,
+    cert: {
+      selfsigned: true,
+      valid: 10,
+      key: null,
+      cert: null,
+    },
+    gun: {
+      port: 9000,
+      host: '0.0.0.0',
+      cache: 'data.json',
+      peers: ['https://localhost:9000/gun'],
+    },
+    host: {
+      id: '123',
+      name: 'trex',
+      priority: 0,
+      node: 'hosts',
+    },
+  };
+
+  const node = new GunHost({
+    peers: cluster.gun.peers,
+    rootNodeName: cluster.name,
+  });
+
+  it('start server', function() {
+    return node.start({
+      host: cluster.gun.host,
+      port: cluster.gun.port,
+      cache: cluster.gun.cache,
+      cert: cluster.cert,
+    }).then(function(resp) {
+      expect(resp).to.eql('gun server started successfully');
+    });
+  });
+
+  it('add node', function() {
+    return node.add(`${cluster.host.node}.${cluster.host.id}`, cluster.host).then(function(resp) {
+      expect(resp.err).to.be(null);
+      expect(resp.ok).to.be(1);
+    });
+  });
+
+  it('get node', function() {
+    return node.get(`${cluster.host.node}.${cluster.host.id}`).then(function(resp) {
+      expect(resp.id).to.be(cluster.host.id);
+    });
+  });
+
+  it('delete node', function() {
+    return node.delete(`${cluster.host.node}.${cluster.host.id}`).then(function(resp) {
+      expect(resp.err).to.be(null);
+      expect(resp.ok).to.be(1);
+    });
+  });
+});
diff --git a/src/__test__/index.js b/src/__test__/index.js
new file mode 100644
index 0000000..9f4df69
--- /dev/null
+++ b/src/__test__/index.js
@@ -0,0 +1 @@
+require('./gun-host');
diff --git a/src/gun-host.js b/src/gun-host.js
index c3a2ec7..32f0226 100644
--- a/src/gun-host.js
+++ b/src/gun-host.js
@@ -32,7 +32,7 @@ class GunHost {
   *
   * @param {string} path for node
   * @param {object} node to add
-  * @return {object} added node
+  * @return {object} ack
   */
   add(path, node) {
     return this.host.put(path, node);
diff --git a/src/gun-promise.js b/src/gun-promise.js
index c5b4143..e91a1cf 100644
--- a/src/gun-promise.js
+++ b/src/gun-promise.js
@@ -55,7 +55,7 @@ class GunPromise {
   *
   * @param {string} pathway - a.b.c or a
   * @param {object} value
-  * @return {object} new Gun node which contains value properties
+  * @return {object} ack
   */
   put(pathway, value) {
     return new Promise((resolve, reject) => {
@@ -72,14 +72,14 @@ class GunPromise {
   * Check if value exists
   *
   * @param {string} pathway - a.b.c or a
-  * @return {boolean}
+  * @return {boolean} exist
   */
   exists(pathway) {
     return new Promise((resolve, reject) => {
       this.node.path(pathway).val(function(value) {
         resolve(value ? true : false);
-      }); 
-    }); 
+      });
+    });
   }
 
   /**
@@ -108,7 +108,7 @@ class GunPromise {
       // 'null' put here to facilitate filtering deleted values
       this.node.path(pathway).put(null);
       // Gun bug, .put(cb) callback is not resolved if value is null: https://github.com/amark/gun/issues/453
-      resolve(null);
+      resolve({err: null, ok: 1});
     });
   }
 }
diff --git a/test/index.js b/test/index.js
new file mode 100644
index 0000000..6775ce1
--- /dev/null
+++ b/test/index.js
@@ -0,0 +1 @@
+require('../src/__test__');