diff --git a/composer.json b/composer.json
index 10459b6..4bf7cab 100644
--- a/composer.json
+++ b/composer.json
@@ -31,6 +31,7 @@
   },
   "require-dev": {
     "squizlabs/php_codesniffer": "^3.0",
-    "phpunit/phpunit": "^5.7"
+    "phpunit/phpunit": "^5.7",
+    "php-mock/php-mock-phpunit": "^1.1"
   }
 }
diff --git a/tests/Authentication/AuthTest.php b/tests/Authentication/AuthTest.php
index 65e1450..9599134 100644
--- a/tests/Authentication/AuthTest.php
+++ b/tests/Authentication/AuthTest.php
@@ -4,10 +4,13 @@
 
 use BikeShare\Authentication\Auth;
 use BikeShare\Db\DbInterface;
+use phpmock\phpunit\PHPMock;
 use PHPUnit\Framework\TestCase;
 
 class AuthTest extends TestCase
 {
+    use PHPMock;
+
     /**
      * @phpcs:disable PSR12.Properties.ConstantVisibility
      */
@@ -128,6 +131,11 @@ public function testLogin()
         $number = 'number';
         $password = 'password';
         $userId = '123';
+
+        $this->getFunctionMock('BikeShare\Authentication', 'time')
+            ->expects($this->exactly(2))
+            ->willReturn(9999);
+
         $this->db->expects($this->exactly(2))
             ->method('escape')
             ->withConsecutive(
@@ -150,6 +158,21 @@ public function testLogin()
                 null
             );
 
+        $this->getFunctionMock('BikeShare\Authentication', 'setcookie')
+            ->expects($this->exactly(2))
+            ->withConsecutive(
+                ['loguserid', $userId, 1219599],
+                ['logsession', $sessionId, 1219599]
+            )
+            ->willReturn(true);
+
+        $this->getFunctionMock('BikeShare\Authentication', 'header')
+            ->expects($this->exactly(3))
+            ->withConsecutive(
+                ['HTTP/1.1 302 Found'],
+                ['Location: /'],
+                ['Connection: close']
+            );
 
         $this->auth->login($number, $password);
     }
@@ -170,12 +193,19 @@ public function testisLoggedIn(
         if ($sessionId) {
             $_COOKIE["logsession"] = $sessionId;
         }
-        $this->db->expects($this->exactly(count($escapeCallParams)))
+
+        $this->getFunctionMock('BikeShare\Authentication', 'time')
+            ->expects(count($escapeCallParams) > 0 ? $this->once() : $this->never())
+            ->willReturn(9999);
+
+        $this->db
+            ->expects($this->exactly(count($escapeCallParams)))
             ->method('escape')
             ->withConsecutive(...$escapeCallParams)
             ->willReturnOnConsecutiveCalls(...$escapeCallResults);
 
-        $this->db->expects(count($escapeCallParams) > 0 ? $this->exactly(1) : $this->never())
+        $this->db
+            ->expects(count($escapeCallParams) > 0 ? $this->once() : $this->never())
             ->method('query')
             ->withConsecutive(
                 ["SELECT sessionId FROM sessions WHERE
@@ -240,6 +270,26 @@ public function testLogout()
                 $sessionId
             );
 
+        $this->getFunctionMock('BikeShare\Authentication', 'time')
+            ->expects($this->exactly(3))
+            ->willReturn(9999);
+
+        $this->getFunctionMock('BikeShare\Authentication', 'setcookie')
+            ->expects($this->exactly(2))
+            ->withConsecutive(
+                ['loguserid', '0', 6399, '/'],
+                ['logsession', '', 6399, '/']
+            )
+            ->willReturn(true);
+
+        $this->getFunctionMock('BikeShare\Authentication', 'header')
+            ->expects($this->exactly(3))
+            ->withConsecutive(
+                ['HTTP/1.1 302 Found'],
+                ['Location: /'],
+                ['Connection: close']
+            );
+
         $this->db->expects($this->exactly(2))
             ->method('query')
             ->withConsecutive(
@@ -276,6 +326,10 @@ public function testRefreshSession()
                 $sessionId
             );
 
+        $this->getFunctionMock('BikeShare\Authentication', 'time')
+            ->expects($this->exactly(4))
+            ->willReturn(9999);
+
         $this->db->expects($this->exactly(4))
             ->method('query')
             ->withConsecutive(
@@ -296,23 +350,3 @@ public function testRefreshSession()
         $this->auth->refreshSession();
     }
 }
-
-/**
- * @phpcs:disable PSR1.Files.SideEffects
- */
-namespace BikeShare\Authentication;
-{
-function header($header, $replace = true, $response_code = 0)
-{
-}
-
-function setcookie($name, $value = '', $options = 0)
-{
-    return true;
-}
-
-function time()
-{
-    return 9999;
-}
-}
diff --git a/tests/SmsConnector/EuroSmsConnectorTest.php b/tests/SmsConnector/EuroSmsConnectorTest.php
index b3a6918..444c51c 100644
--- a/tests/SmsConnector/EuroSmsConnectorTest.php
+++ b/tests/SmsConnector/EuroSmsConnectorTest.php
@@ -3,10 +3,13 @@
 namespace Test\BikeShare\SmsConnector;
 
 use BikeShare\SmsConnector\EuroSmsConnector;
+use phpmock\phpunit\PHPMock;
 use PHPUnit\Framework\TestCase;
 
 class EuroSmsConnectorTest extends TestCase
 {
+    use PHPMock;
+
     /**
      * @var EuroSmsConnector
      */
@@ -107,43 +110,30 @@ public function testRespond()
 
     public function testSend()
     {
-        $this->smsConnector->send('number', 'text');
+        $this->getFunctionMock('BikeShare\SmsConnector', 'md5')
+            ->expects($this->once())
+            ->with('Key' . 'number')
+            ->willReturn('123456789011223344556677889900aa');
+        $this->getFunctionMock('BikeShare\SmsConnector', 'substr')
+            ->expects($this->once())
+            ->with('123456789011223344556677889900aa', 10, 11)
+            ->willReturn('1122334455');
+        $this->getFunctionMock('BikeShare\SmsConnector', 'urlencode')
+            ->expects($this->once())
+            ->with('text!@-_ +')
+            ->willReturn(urlencode('text!@-_ +'));
+
+        $expectedUrl = 'http://as.eurosms.com/sms/Sender?action=send1SMSHTTP&i=Id&'
+            . 's=1122334455&d=1&sender=SenderNumber&number=number&msg=text%21%40-_+%2B';
+
+        $this->getFunctionMock('BikeShare\SmsConnector', 'fopen')
+            ->expects($this->once())
+            ->with(
+                $expectedUrl,
+                'r'
+            )->willReturn(true);
+
+        $this->smsConnector->send('number', 'text!@-_ +');
         $this->expectOutputString('');
     }
 }
-
-/**
- * @phpcs:disable PSR1.Files.SideEffects
- */
-namespace BikeShare\SmsConnector;
-{
-
-/**
- * no need to send real request to as.eurosms.com
- * TODO should be refactored to use Guzzle or similar
- */
-function fopen($filename, $mode, $use_include_path = null, $context = null)
-{
-    $gatewayId = 'Id';
-    $gatewayKey = 'Key';
-    $gatewaySenderNumber = 'SenderNumber';
-    $message = 'text';
-    $number = 'number';
-    $s = substr(md5($gatewayKey . $number), 10, 11);
-    $um = urlencode($message);
-
-    $url = sprintf(
-        'http://as.eurosms.com/sms/Sender?action=send1SMSHTTP&i=%s&s=%s&d=1&sender=%s&number=%s&msg=%s',
-        $gatewayId,
-        $s,
-        $gatewaySenderNumber,
-        $number,
-        $um
-    );
-
-    if ($filename !== $url) {
-        throw new \RuntimeException('Invalid URL generated');
-    }
-}
-
-}