diff --git a/checkout.bat b/checkout.bat
index 504cef6..2e36e94 100644
--- a/checkout.bat
+++ b/checkout.bat
@@ -10,11 +10,6 @@ if "%1" == "" (
   exit /b 1
 )
 
-if "%TAG%" == "hw3" (
-  echo hw3 not implemented yet
-  exit /b 1
-)
-
 if "%TAG%" == "hw4" (
   echo hw4 not implemented yet
   exit /b 1
@@ -24,6 +19,10 @@ if "%TAG%" == "hw2" (
   set SUB_DIR=ng1
 )
 
+if "%TAG%" == "hw3" (
+  set SUB_DIR=ng1
+)
+
 if "%SUB_DIR%" == "" (
   echo unknown tag
   exit /b 1
diff --git a/checkout.sh b/checkout.sh
index 8524c3f..c8e703c 100755
--- a/checkout.sh
+++ b/checkout.sh
@@ -12,12 +12,12 @@ if [ $# -eq 0 ];then
   exit 1
 fi
 
-if [ $TAG == "hw3" ] || [ $TAG == "hw4" ]; then
+if [ $TAG == "hw4" ]; then
   echo 'not implemented yet'
   exit 1
 fi
 
-if [ $TAG == "hw2" ]; then
+if [ $TAG == "hw2" ] || [ $TAG == "hw3" ]; then
   SUB_DIR="ng1"
 fi
 
diff --git a/hw3-spec.js b/hw3-spec.js
index 4a6a7b4..7b7199c 100644
--- a/hw3-spec.js
+++ b/hw3-spec.js
@@ -1,9 +1,133 @@
 'use strict';
 
-describe('Application part 3', function () {
+var BASE_URL = 'http://localhost:3000/';
 
-    it('should ...', function () {
-        fail('part 3 tests not implemented yet');
+describe('Application part 3', function() {
+
+    it('should insert contact with name and phone number', done => {
+        var sampleData = getSampleData();
+        var data = { name : sampleData.name, phone : sampleData.phone };
+
+        post('api/contacts', data).then(() => {
+            return get('api/contacts');
+        }).then(contacts => {
+            expect(contacts.map(each => each.name)).toContain(sampleData.name);
+            expect(contacts.map(each => each.phone)).toContain(sampleData.phone);
+            done();
+        });
     });
 
+    it('should modify contact', done => {
+        var name = getSampleData().name;
+        var nameChanged = name + 1;
+
+        post('api/contacts', { name : name }).then(() => {
+            return get('api/contacts');
+        }).then(contacts => {
+            var fetchedItem = contacts.filter(each => each.name === name).pop();
+            fetchedItem.name = nameChanged;
+            return put('api/contacts/' + fetchedItem.id, fetchedItem);
+        }).then(() => {
+            return get('api/contacts');
+        }).then(contacts => {
+            expect(contacts.map(each => each.name)).not.toContain(name);
+            expect(contacts.map(each => each.name)).toContain(nameChanged);
+            done();
+        });
+    });
+
+    it('should delete contact', done => {
+        var name = getSampleData().name;
+
+        post('api/contacts', { name : name }).then(() => {
+            return get('api/contacts');
+        }).then(contacts => {
+            var id = contacts.filter(each => each.name === name).pop()._id;
+            return del('api/contacts/' + id);
+        }).then(() => {
+            return get('api/contacts');
+        }).then(contacts => {
+            expect(contacts.map(each => each.name)).not.toContain(name);
+            done();
+        });
+    });
+
+    it('should delete multiple contacts', done => {
+        var name = 'Jack';
+
+        post('api/contacts', { name : name }).then(() => {
+            return post('api/contacts', { name : name });
+        }).then(() => {
+            return get('api/contacts');
+        }).then(contacts => {
+            var ids = contacts
+                .filter(each => each.name === name)
+                .map(each => each._id);
+            return post('api/contacts/delete', ids);
+        }).then(() => {
+            return get('api/contacts');
+        }).then(contacts => {
+            expect(contacts.map(each => each.name)).not.toContain(name);
+            done();
+        });
+    });
 });
+
+var request = require('request');
+
+function get(url) {
+    return new Promise((resolve, reject) => {
+        request(getUrl(url), function(error, response, body) {
+            if (error) {
+                reject(error);
+            } else if (response.statusCode !== 200) {
+                reject(body);
+            } else {
+                resolve(JSON.parse(body));
+            }
+        });
+    });
+}
+
+function del(url) {
+    return modifyCommon(url, 'DELETE', undefined);
+}
+
+function post(url, data) {
+    return modifyCommon(url, 'POST', data);
+}
+
+function put(url, data) {
+    return modifyCommon(url, 'PUT', data);
+}
+
+function modifyCommon(url, method, data) {
+    return new Promise((resolve, reject) => {
+        request({
+            headers: { 'Content-type': 'application/json' },
+            url : getUrl(url),
+            method: method,
+            body: JSON.stringify(data)
+        }, (error, response, body) => {
+            if (error) {
+                reject(error);
+            } else if (response.statusCode !== 200) {
+                reject(body);
+            } else {
+                resolve();
+            }
+        });
+    });
+}
+
+function getSampleData() {
+    var time = new Date().getTime();
+    return {
+        name : time,
+        phone : time + 1
+    };
+}
+
+function getUrl(path) {
+    return BASE_URL.replace(/\/$/, '') + '/' + path;
+}
diff --git a/package.json b/package.json
index 1c6bfe9..d230bac 100644
--- a/package.json
+++ b/package.json
@@ -6,10 +6,11 @@
     "postinstall": "npm run update",
     "start": "webdriver-manager start",
     "hw2tests": "protractor ./conf.js --suite=hw2",
-    "hw3tests": "protractor ./conf.js --suite=hw3",
+    "hw3tests": "jasmine-node --matchall hw3-spec.js",
     "hw4tests": "protractor ./conf.js --suite=hw4"
   },
   "devDependencies": {
+    "jasmine-node": "^1.14.5",
     "phantomjs": "^2.1.7",
     "protractor": "^4.0.11",
     "request": "^2.79.0"