Add unit tests for signature methods, and a couple for Request.

tests/PlainTextTest.php

@@ -0,0 +1,75 @@
+<?php
+
+use Mockery as m;
+use GaryJones\OAuth\PlainText;
+
+class PlainTextTest extends PHPUnit_Framework_TestCase
+{
+    public function tearDown()
+    {
+        m::close();
+    }
+
+    public function testSignatureName()
+    {
+        $plaintext = $this->getSignatureMethod();
+        $this->assertEquals('PLAINTEXT', $plaintext->getName());
+    }
+
+    public function testBuildSignatureWithoutToken()
+    {
+        // Create instance of class to test
+        $plaintext = $this->getSignatureMethod();
+
+        // Get mock objects
+        $request = $this->getRequest();
+        $client = $this->getClient();
+
+        // Run method being tested
+        $signature = $plaintext->buildSignature($request, $client);
+
+        // Check results
+        $this->assertEquals('secret&', $signature);
+    }
+
+    public function testBuildSignatureWithToken()
+    {
+        // Create instance of class to test
+        $plaintext = $this->getSignatureMethod();
+
+        // Get mock objects
+        $request = $this->getRequest();
+        $client = $this->getClient();
+        $token = $this->getToken();
+
+        // Run method being tested
+        $signature = $plaintext->buildSignature($request, $client, $token);
+
+        // Check results
+        $this->assertEquals('secret&token_secret', $signature);
+    }
+
+    private function getSignatureMethod()
+    {
+        return new PlainText;
+    }
+
+    private function getRequest()
+    {
+        return m::mock('GaryJones\OAuth\Request');
+    }
+
+    private function getClient()
+    {
+        return m::mock('GaryJones\OAuth\Client', function ($mock) {
+            $mock->shouldReceive('getSecret')->withNoArgs()->andReturn('secret')->once();
+        });
+    }
+
+    private function getToken()
+    {
+        return m::mock('GaryJones\OAuth\Token', function ($mock) {
+            $mock->shouldReceive('getSecret')->withNoArgs()->andReturn('token_secret');
+        });
+    }
+}