Add unit tests

.travis.yml

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+language: php
+
+php:
+  - 5.3.3
+  - 5.3
+  - 5.4
+  - 5.5
+  - hhvm
+
+before_script:
+  - composer self-update
+  - composer update --prefer-source --dev
+
+script:
+  - ./vendor/bin/phpunit

phpunit.xml.dist

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

tests/Bijective/Tests/BijectiveTranslatorTest.php

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+<?php
+
+namespace Bijective\Tests;
+
+use Bijective\BijectiveTranslator;
+
+/**
+ * @coversDefaultClass Bijective\BijectiveTranslator
+ *
+ * @package Bijective
+ *
+ * @author Brian Freytag <brian@idltg.in>
+ */
+class BijectiveTranslatorTest extends \PHPUnit_Framework_TestCase
+{
+    /** @var BijectiveTranslator */
+    private $bijective;
+
+    public function setUp()
+    {
+        $this->bijective = new BijectiveTranslator();
+    }
+
+    public function testEncodeReturnsString()
+    {
+        $this->assertInternalType('string', $this->bijective->encode("123"));
+        $this->assertInternalType('string', $this->bijective->encode(1234));
+        $this->assertInternalType('string', $this->bijective->encode('432'));
+    }
+
+    /**
+     * @expectedException \Bijective\Exception\BijectiveException
+     */
+    public function testEncodeThrowsExceptionOnInvalidTypes()
+    {
+        $this->bijective->encode(array());
+        $this->bijective->encode("string");
+        $this->bijective->encode(new \stdClass());
+    }
+
+    public function testDecodeReturnsInteger()
+    {
+        $this->assertInternalType('integer', $this->bijective->decode("asfdw"));
+        $this->assertInternalType('integer', $this->bijective->decode("jiadoasdf"));
+        $this->assertInternalType('integer', $this->bijective->decode("ADSjf3asdf"));
+    }
+
+    /**
+     * @expectedException \Bijective\Exception\BijectiveException
+     */
+    public function testDecodesThrowsExceptionOnInvalidTypes()
+    {
+        $this->bijective->decode(1234);
+        $this->bijective->decode(array());
+        $this->bijective->decode(new \stdClass());
+    }
+
+    public function testEncodeDecodeReturnExpectedValues()
+    {
+        $this->assertEquals('ct', $this->bijective->encode(123));
+        $this->assertEquals(123, $this->bijective->decode('ct'));
+
+        $this->assertEquals(
+            'fdspadsf',
+            $this->bijective->encode($this->bijective->decode('fdspadsf'))
+        );
+
+        $this->assertEquals(
+            43489,
+            $this->bijective->decode($this->bijective->encode(43489))
+        );
+    }
+}