Add unit tests and usage example to README

More/EAV/Tests/ValueTest.php

@@ -0,0 +1,59 @@
+<?php
+
+namespace DesignPatterns\More\EAV\Tests;
+
+use DesignPatterns\More\EAV\Attribute;
+use DesignPatterns\More\EAV\Value;
+
+/**
+ * ValueTest tests the Value model of EAV pattern
+ */
+class ValueTest extends \PHPUnit_Framework_TestCase
+{
+    public function testCreationFailureWithoutAttribute()
+    {
+        $isFailure = false;
+
+        try {
+            new Value();
+        } catch (\Exception $e) {
+            $isFailure = true;
+        }
+
+        $this->assertTrue($isFailure);
+    }
+
+    public function testCreationSuccessWithAttribute()
+    {
+        $attribute = new Attribute();
+        $attribute->setName('Color');
+
+        $value = new Value($attribute);
+
+        $this->assertInstanceOf('\DesignPatterns\More\EAV\Value', $value);
+    }
+
+    public function testSetGetName()
+    {
+        $attribute = new Attribute();
+        $attribute->setName('Color');
+
+        $value = new Value($attribute);
+        $value->setName('Silver');
+
+        $this->assertEquals('Silver', $value->getName());
+    }
+
+    public function testSetGetAttribute()
+    {
+        $attribute = new Attribute();
+        $attribute->setName('Color');
+
+        $value = new Value($attribute);
+        $value->setName('Silver');
+        $this->assertSame($attribute, $value->getAttribute());
+
+        $value->setAttribute($attribute);
+        $this->assertSame($attribute, $value->getAttribute());
+    }
+}