diff --git a/.gitignore b/.gitignore
index fc595dc..746f9e1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 .DS_Store
+.idea
 /composer.lock
 /vendor
 /build
\ No newline at end of file
diff --git a/src/Nacha/Batch.php b/src/Nacha/Batch.php
index 4d87032..c94921a 100644
--- a/src/Nacha/Batch.php
+++ b/src/Nacha/Batch.php
@@ -6,7 +6,12 @@
 use Nacha\Record\BatchFooter;
 use Nacha\Record\DebitEntry;
 use Nacha\Record\CcdEntry;
+use Nacha\Record\Entry;
 
+/**
+ * Class Batch
+ * @package Nacha
+ */
 class Batch {
 
 	// Service Class Codes
@@ -15,9 +20,13 @@ class Batch {
 	const DEBITS_ONLY  = 225;
 
 	private $header;
-	private $debitEntries = [];
+
+	/** @var DebitEntry[] */
 	private $creditEntries = [];
 
+	/** @var CcdEntry[] */
+	private $debitEntries = [];
+
 	public function __construct() {
 		$this->header = new BatchHeader();
 	}
@@ -53,13 +62,15 @@ public function addCreditEntry(CcdEntry $entry) {
 
 	public function getEntryHash() {
 		$hash    = 0;
+		/** @var Entry[] $entries */
 		$entries = array_merge($this->debitEntries, $this->creditEntries);
 
 		foreach ($entries as $entry) {
 			$hash += $entry->getHashable();
 		}
 
-		return substr((string)$hash, -10); // only take 10 digits from end of string to 10
+		$hashStr = substr((string)$hash, -10); // only take 10 digits from end of string to 10
+		return intval($hashStr);
 	}
 
 	public function __toString() {
diff --git a/src/Nacha/Field/Number.php b/src/Nacha/Field/Number.php
index 1dd98bf..3c122e5 100644
--- a/src/Nacha/Field/Number.php
+++ b/src/Nacha/Field/Number.php
@@ -11,17 +11,17 @@ public function __construct($value, $length) {
 		$this->value  = (int)$value;
 		$this->length = $length;
 
-		if (strlen($value) > $length) {
-			throw new InvalidFieldException('Length of "' . $value . '" must be '.$length.'.');
-		}
-
 		if (!is_int($this->value)) {
 			throw new InvalidFieldException('Value "' . $value . '" must be an integer.');
 		}
+
+		if (strlen($value) > $length) {
+			throw new InvalidFieldException('Length of "' . $value . '" must be '.$length.'.');
+		}
 	}
 	
 	public function __toString() {
-		return sprintf('%0' . $this->length . 'd', $this->value);
+		return sprintf("%0{$this->length}d", $this->value);
 	}
 
 }
\ No newline at end of file
diff --git a/src/Nacha/Field/String.php b/src/Nacha/Field/String.php
index 96839bc..837ef2d 100644
--- a/src/Nacha/Field/String.php
+++ b/src/Nacha/Field/String.php
@@ -22,5 +22,4 @@ public function __construct($value, $length) {
 	public function __toString() {
 		return sprintf('%-' . $this->length . 's', $this->value);
 	}
-
 }
\ No newline at end of file
diff --git a/src/Nacha/File.php b/src/Nacha/File.php
index 87c8919..a706a8a 100644
--- a/src/Nacha/File.php
+++ b/src/Nacha/File.php
@@ -9,6 +9,7 @@
 class File {
 
 	private $header;
+	/** @var Batch[] */
 	private $batches = [];
 
 	public function __construct() {
diff --git a/src/Nacha/Record/Entry.php b/src/Nacha/Record/Entry.php
index ceaecbc..ab6c4ea 100644
--- a/src/Nacha/Record/Entry.php
+++ b/src/Nacha/Record/Entry.php
@@ -2,7 +2,6 @@
 
 namespace Nacha\Record;
 
-use Nacha\Field\String;
 use Nacha\Field\Number;
 use Nacha\Field\TransactionCode;
 use Nacha\Field\Amount;
diff --git a/src/Nacha/Record/FileHeader.php b/src/Nacha/Record/FileHeader.php
index 5bc0d8c..a71ab02 100644
--- a/src/Nacha/Record/FileHeader.php
+++ b/src/Nacha/Record/FileHeader.php
@@ -29,7 +29,7 @@ public function __construct() {
 		$this->setBlockingFactor(10);
 		$this->setFormatCode(1);
 		$this->setFileIdModifier('A');
-		$this->setFileCreationDate(date('ymd', time()));
+		$this->setFileCreationDate(date('ymd'));
 
 		// optional
 		$this->setImmediateDestinationName('');
diff --git a/test/Nacha/BatchTest.php b/test/Nacha/BatchTest.php
index ab994f2..09f600b 100644
--- a/test/Nacha/BatchTest.php
+++ b/test/Nacha/BatchTest.php
@@ -5,8 +5,15 @@
 use Nacha\Record\DebitEntry;
 use Nacha\Record\CcdEntry;
 
+/**
+ * Class BatchTest
+ * @package Nacha
+ */
 class BatchTest extends \PHPUnit_Framework_TestCase {
 
+	/** @var Batch */
+	private $batch;
+
 	public function setup() {
 		$this->batch = new Batch();
 		$this->batch->getHeader()->setBatchNumber(1)
diff --git a/test/Nacha/Field/AmountTest.php b/test/Nacha/Field/AmountTest.php
index 216d298..18c225f 100644
--- a/test/Nacha/Field/AmountTest.php
+++ b/test/Nacha/Field/AmountTest.php
@@ -5,14 +5,14 @@
 class AmountTest extends \PHPUnit_Framework_TestCase {
 
 	/**
-	 * @expectedException Nacha\Field\InvalidFieldException
+	 * @expectedException \Nacha\Field\InvalidFieldException
 	 */
 	public function testInvalidLength_Float() {
 		new Amount(100000000.00); // only accepts $99M
 	}
 
 	/**
-	 * @expectedException Nacha\Field\InvalidFieldException
+	 * @expectedException \Nacha\Field\InvalidFieldException
 	 */
 	public function testInvalidLength_String() {
 		new Amount('100000000.00'); // only accepts $99M
diff --git a/test/Nacha/Field/NumberTest.php b/test/Nacha/Field/NumberTest.php
index 0a3daf2..7267144 100644
--- a/test/Nacha/Field/NumberTest.php
+++ b/test/Nacha/Field/NumberTest.php
@@ -12,11 +12,26 @@ public function testPadding() {
 		$this->assertEquals('0000000101', (string)$nbr);
 	}
 
+	public function testMaxPadding() {
+		// given
+		$nbr = new Number(1234567891, 10);
+
+		// then
+		$this->assertEquals('1234567891', (string)$nbr);
+	}
+
 	/**
-	 * @expectedException Nacha\Field\InvalidFieldException
+	 * @expectedException \Nacha\Field\InvalidFieldException
 	 */
 	public function testTruncation() {
 		new Number(111101, 5);
 	}
 
+	/**
+	 * @expectedException \Nacha\Field\InvalidFieldException
+	 */
+	public function testNotNumber() {
+		new Number("testme", 5);
+	}
+
 }
\ No newline at end of file
diff --git a/test/Nacha/Field/RoutingNumberTest.php b/test/Nacha/Field/RoutingNumberTest.php
index 2626bdf..952ee7c 100644
--- a/test/Nacha/Field/RoutingNumberTest.php
+++ b/test/Nacha/Field/RoutingNumberTest.php
@@ -12,4 +12,11 @@ public function testLength() {
 		$this->assertEquals('001243123', (string)$nbr);
 	}
 
+	/**
+	 * @expectedException \Nacha\Field\InvalidFieldException
+	 */
+	public function testInvalidLength() {
+		new RoutingNumber(111101);
+	}
+
 }
\ No newline at end of file
diff --git a/test/Nacha/Field/StringTest.php b/test/Nacha/Field/StringTest.php
index e5881c0..7ffaf51 100644
--- a/test/Nacha/Field/StringTest.php
+++ b/test/Nacha/Field/StringTest.php
@@ -12,4 +12,17 @@ public function testPadding() {
 		$this->assertEquals('Hello World                     ', (string)$str);
 	}
 
+	/**
+	 * @expectedException \Nacha\Field\InvalidFieldException
+	 */
+	public function testNotString() {
+		new String(12, 32);
+	}
+
+	/**
+	 * @expectedException \Nacha\Field\InvalidFieldException
+	 */
+	public function testInvalidCharacter() {
+		new String("!testtext", 32);
+	}
 }
\ No newline at end of file