Added Str tests.

tests/Cases/StrTest.php

+<?php
+
+class StrTest extends PHPUnit_Framework_TestCase {
+
+	public function test_lower()
+	{
+		$this->assertEquals('something', Laravel\Str::lower('SomeThing'));
+		$this->assertEquals('τάχιστη', Laravel\Str::lower('ΤΆΧΙΣΤΗ'));
+	}
+
+	public function test_upper()
+	{
+		$this->assertEquals('SPEAK LOUDER', Laravel\Str::upper('speak louder'));
+		$this->assertEquals('ΤΆΧΙΣΤΗ', Laravel\Str::upper('Τάχιστη'));
+	}
+
+	public function test_title()
+	{
+		$this->assertEquals('This Is A Test', Laravel\Str::title('this is a test'));
+		$this->assertEquals('Τάχιστη Τάχιστη', Laravel\Str::title('τάχιστη τάχιστη'));
+	}
+
+	public function test_length()
+	{
+		$this->assertEquals(4, Laravel\Str::length('four'));
+		$this->assertEquals(7, Laravel\Str::length('τάχιστη'));
+	}
+
+	public function test_ascii()
+	{
+		$this->assertEquals('Deuxieme Article', Laravel\Str::ascii('Deuxième Article'));
+	}
+
+	public function test_random()
+	{
+		$this->assertEquals(5, strlen(Laravel\Str::random(5)));
+	}
+}
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