diff --git a/test/unit/HttpProviderTest.php b/test/unit/HttpProviderTest.php
index 3a28bf2..f1ef4bf 100644
--- a/test/unit/HttpProviderTest.php
+++ b/test/unit/HttpProviderTest.php
@@ -17,7 +17,7 @@ class HttpProviderTest extends TestCase
      */
     public function testSend()
     {
-        $requestManager = new HttpRequestManager('http://localhost:8545');
+        $requestManager = new HttpRequestManager($this->testHost);
         $provider = new HttpProvider($requestManager);
         $method = new ClientVersion('web3_clientVersion', []);
 
@@ -36,7 +36,7 @@ class HttpProviderTest extends TestCase
      */
     public function testBatch()
     {
-        $requestManager = new HttpRequestManager('http://localhost:8545');
+        $requestManager = new HttpRequestManager($this->testHost);
         $provider = new HttpProvider($requestManager);
         $method = new ClientVersion('web3_clientVersion', []);
         $callback = function ($err, $data) {
diff --git a/test/unit/IntegerFormatterTest.php b/test/unit/IntegerFormatterTest.php
index 193e19d..1476f64 100644
--- a/test/unit/IntegerFormatterTest.php
+++ b/test/unit/IntegerFormatterTest.php
@@ -45,5 +45,11 @@ class IntegerFormatterTest extends TestCase
 
         $hex = $formatter->format('1', 20);
         $this->assertEquals($hex, implode('', array_fill(0, 19, '0')) . '1');
+
+        $hex = $formatter->format(48);
+        $this->assertEquals($hex, implode('', array_fill(0, 62, '0')) . '30');
+
+        $hex = $formatter->format('48');
+        $this->assertEquals($hex, implode('', array_fill(0, 62, '0')) . '30');
     }
 }
\ No newline at end of file
diff --git a/test/unit/UtilsTest.php b/test/unit/UtilsTest.php
index 50b3f0e..5856b22 100644
--- a/test/unit/UtilsTest.php
+++ b/test/unit/UtilsTest.php
@@ -87,6 +87,16 @@ class UtilsTest extends TestCase
         $this->assertEquals('0x', Utils::toHex(0, true));
         $this->assertEquals('0x', Utils::toHex(new BigNumber(0), true));
 
+        $this->assertEquals('0x30', Utils::toHex(48, true));
+        $this->assertEquals('0x30', Utils::toHex('48', true));
+        $this->assertEquals('30', Utils::toHex(48));
+        $this->assertEquals('30', Utils::toHex('48'));
+
+        $this->assertEquals('0x30', Utils::toHex(new BigNumber(48), true));
+        $this->assertEquals('0x30', Utils::toHex(new BigNumber('48'), true));
+        $this->assertEquals('30', Utils::toHex(new BigNumber(48)));
+        $this->assertEquals('30', Utils::toHex(new BigNumber('48')));
+
         $this->expectException(InvalidArgumentException::class);
         $hex = Utils::toHex(new stdClass);
     }