diff --git a/test/unit/BigNumberFormatterTest.php b/test/unit/BigNumberFormatterTest.php
new file mode 100644
index 0000000..7b96704
--- /dev/null
+++ b/test/unit/BigNumberFormatterTest.php
@@ -0,0 +1,42 @@
+<?php
+
+namespace Test\Unit;
+
+use Test\TestCase;
+use phpseclib\Math\BigInteger as BigNumber;
+use Web3\Formatters\BigNumberFormatter;
+
+class BigNumberFormatterTest extends TestCase
+{
+    /**
+     * formatter
+     * 
+     * @var \Web3\Formatters\BigNumberFormatter
+     */
+    protected $formatter;
+
+    /**
+     * setUp
+     * 
+     * @return void
+     */
+    public function setUp()
+    {
+        parent::setUp();
+        $this->formatter = new BigNumberFormatter;
+    }
+
+    /**
+     * testFormat
+     * 
+     * @return void
+     */
+    public function testFormat()
+    {
+        $formatter = $this->formatter;
+
+        $bigNumber = $formatter->format(1);
+        $this->assertEquals($bigNumber->toString(), '1');
+        $this->assertTrue($bigNumber instanceof BigNumber);
+    }
+}
\ No newline at end of file
diff --git a/test/unit/BooleanFormatterTest.php b/test/unit/BooleanFormatterTest.php
index 2522092..3736123 100644
--- a/test/unit/BooleanFormatterTest.php
+++ b/test/unit/BooleanFormatterTest.php
@@ -10,7 +10,7 @@ class BooleanFormatterTest extends TestCase
     /**
      * formatter
      * 
-     * @var \Web3\Formatters\Boolean
+     * @var \Web3\Formatters\BooleanFormatter
      */
     protected $formatter;
 
@@ -35,11 +35,9 @@ class BooleanFormatterTest extends TestCase
         $formatter = $this->formatter;
 
         $boolean = $formatter->format(true);
-
         $this->assertEquals($boolean, 1);
 
         $boolean = $formatter->format(false);
-
         $this->assertEquals($boolean, 0);
     }
 }
\ No newline at end of file
diff --git a/test/unit/IntegerFormatterTest.php b/test/unit/IntegerFormatterTest.php
index 523d0bf..193e19d 100644
--- a/test/unit/IntegerFormatterTest.php
+++ b/test/unit/IntegerFormatterTest.php
@@ -10,7 +10,7 @@ class IntegerFormatterTest extends TestCase
     /**
      * formatter
      * 
-     * @var \Web3\Formatters\Integer
+     * @var \Web3\Formatters\IntegerFormatter
      */
     protected $formatter;
 
@@ -35,15 +35,15 @@ class IntegerFormatterTest extends TestCase
         $formatter = $this->formatter;
 
         $hex = $formatter->format('1');
-
         $this->assertEquals($hex, implode('', array_fill(0, 63, '0')) . '1');
 
         $hex = $formatter->format('-1');
-
         $this->assertEquals($hex, implode('', array_fill(0, 64, 'f')));
 
         $hex = $formatter->format('ae');
-
         $this->assertEquals($hex, implode('', array_fill(0, 62, '0')) . 'ae');
+
+        $hex = $formatter->format('1', 20);
+        $this->assertEquals($hex, implode('', array_fill(0, 19, '0')) . '1');
     }
 }
\ No newline at end of file