Fixed issue #42 and tweaked tests

.travis.yml

@@ -16,4 +16,4 @@ before_script:
   - composer self-update
   - composer install --dev --no-interaction
 
-script: phpunit tests
\ No newline at end of file
+script: phpunit

phpunit.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit backupGlobals="false"
+         backupStaticAttributes="false"
+         bootstrap="tests/bootstrap.php"
+         colors="true"
+         convertErrorsToExceptions="true"
+         convertNoticesToExceptions="true"
+         convertWarningsToExceptions="true"
+         processIsolation="false"
+         stopOnFailure="false"
+         syntaxCheck="false"
+>
+    <testsuites>
+        <testsuite name="Laravel MongoDB Test Suite">
+            <directory>tests/</directory>
+        </testsuite>
+    </testsuites>
+</phpunit>

src/Jenssegers/Mongodb/Builder.php

@@ -586,7 +586,7 @@ class Builder extends \Illuminate\Database\Query\Builder {
                     }
                 }
                 // Single value
-                else
+                elseif (isset($where['value']))
                 {
                     $where['value'] = $this->convertKey($where['value']);
                 }

tests/CacheTest.php

 <?php
-require_once('tests/app.php');
 
 use Illuminate\Support\Facades\DB;
 

tests/ConnectionTest.php

 <?php
-require_once('tests/app.php');
-
 use Illuminate\Support\Facades\DB;
 use Jenssegers\Mongodb\Connection;
 

tests/ModelTest.php

 <?php
-require_once('tests/app.php');
 
 class ModelTest extends PHPUnit_Framework_TestCase {
 

tests/QueryBuilderTest.php

 <?php
-require_once('tests/app.php');
 
 use Illuminate\Support\Facades\DB;
 
@@ -93,6 +92,12 @@ class QueryBuilderTest extends PHPUnit_Framework_TestCase {
 		$this->assertEquals('John Doe', $user['name']);
 	}
 
+	public function testFindNull()
+	{
+		$user = DB::collection('users')->find(null);
+		$this->assertEquals(null, $user);
+	}
+
 	public function testCount()
 	{
 		DB::collection('users')->insert(array(

tests/QueryTest.php

 <?php
-require_once('tests/app.php');
 
 class QueryTest extends PHPUnit_Framework_TestCase {
 

tests/RelationsTest.php

 <?php
-require_once('tests/app.php');
 
 class RelationsTest extends PHPUnit_Framework_TestCase {
 

tests/SchemaTest.php

 <?php
-require_once('tests/app.php');
 
 use Illuminate\Support\Facades\DB;
 use Illuminate\Support\Facades\Schema;