Add some tests.

tests/unit/SerializerFactoryTest.php

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+<?php
+
+
+namespace Retrinko\Serializer\Test\Unit;
+
+
+use Retrinko\Serializer\SerializerFactory;
+use Retrinko\Serializer\Serializers\JsonSerializer;
+use Retrinko\Serializer\Serializers\NullSerializer;
+use Retrinko\Serializer\Serializers\PhpSerializer;
+
+class SerializerFactoryTest extends \PHPUnit_Framework_TestCase
+{
+    public function supportedContentTypesProvider()
+    {
+        return [
+            [PhpSerializer::SERIALIZED_CONTENT_TYPE,
+             'Retrinko\Serializer\Serializers\PhpSerializer'],
+            [JsonSerializer::SERIALIZED_CONTENT_TYPE,
+             'Retrinko\Serializer\Serializers\JsonSerializer'],
+            [NullSerializer::SERIALIZED_CONTENT_TYPE,
+             'Retrinko\Serializer\Serializers\NullSerializer']
+        ];
+    }
+
+    /**
+     * @dataProvider supportedContentTypesProvider
+     *
+     * @param string $contentType
+     * @param string $expectedSerializerClass
+     *
+     * @throws \Retrinko\Serializer\Exceptions\Exception
+     */
+    public function test_bySerializedContentType_withSupportedContentType_returnsProperSerializer($contentType, $expectedSerializerClass)
+    {
+        $this->assertTrue(SerializerFactory::bySerializedContentType($contentType) instanceof $expectedSerializerClass);
+    }
+
+    /**
+     * @expectedException \Retrinko\Serializer\Exceptions\Exception
+     */
+    public function test_bySerializedContentType_withUnsupportedContentType_thowsException()
+    {
+        SerializerFactory::bySerializedContentType('unsupported content type');
+    }
+}

tests/unit/Serializers/JsonSerizalizerTest.php

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+<?php
+
+
+namespace Retrinko\Serializer\Test\Unit\Serializers;
+
+
+use Retrinko\Serializer\Serializers\JsonSerializer;
+
+class JsonSerizalizerTest extends \PHPUnit_Framework_TestCase
+{
+    public function test_getSerializedContentType_returnsProperValue()
+    {
+        $expected = 'application/json';
+        $this->assertEquals($expected, (new JsonSerializer())->getSerializedContentType());
+    }
+
+    public function test_serialize_retrunsProperValue()
+    {
+        $test = ['a', 'b', 'c'];
+        $expected = json_encode($test);
+        $this->assertEquals($expected, (new JsonSerializer())->serialize($test));
+    }
+
+    public function test_unserialize_retrunsProperValue()
+    {
+        $test = '["a","b","c"]';
+        $expected = json_decode($test, true);
+        $this->assertEquals($expected, (new JsonSerializer())->unserialize($test));
+    }
+}

tests/unit/Serializers/NullSerizalizerTest.php

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+<?php
+
+
+namespace Retrinko\Serializer\Test\Unit\Serializers;
+
+
+use Retrinko\Serializer\Serializers\NullSerializer;
+
+class NullSerizalizerTest extends \PHPUnit_Framework_TestCase
+{
+    public function test_getSerializedContentType_returnsProperValue()
+    {
+        $expected = 'text/plain';
+        $this->assertEquals($expected, (new NullSerializer())->getSerializedContentType());
+    }
+
+    public function test_serialize_retrunsProperValue()
+    {
+        $test = ['a', 'b', 'c'];
+        $expected = $test;
+        $this->assertEquals($expected, (new NullSerializer())->serialize($test));
+    }
+
+    public function test_unserialize_retrunsProperValue()
+    {
+        $test = '["a","b","c"]';
+        $expected = $test;
+        $this->assertEquals($expected, (new NullSerializer())->unserialize($test));
+    }
+}

tests/unit/Serializers/PhpSerizalizerTest.php

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+<?php
+
+
+namespace Retrinko\Serializer\Test\Unit\Serializers;
+
+
+use Retrinko\Serializer\Serializers\PhpSerializer;
+
+class PhpSerizalizerTest extends \PHPUnit_Framework_TestCase
+{
+    public function test_getSerializedContentType_returnsProperValue()
+    {
+        $expected = 'application/php/serialize/base64_encode';
+        $this->assertEquals($expected, (new PhpSerializer())->getSerializedContentType());
+    }
+
+    public function test_serialize_retrunsProperValue()
+    {
+        $test = ['a', 'b', 'c'];
+        $expected = base64_encode(serialize($test));
+        $this->assertEquals($expected, (new PhpSerializer())->serialize($test));
+    }
+
+    public function test_unserialize_retrunsProperValue()
+    {
+        $expected = ['a', 'b', 'c'];
+        $test = base64_encode(serialize($expected));
+        $this->assertEquals($expected, (new PhpSerializer())->unserialize($test));
+    }
+}