Add tests for concrete method inside abstract SignatureMethod class.

tests/SignatureMethodTest.php

@@ -0,0 +1,80 @@
+<?php
+
+use Mockery as m;
+use GaryJones\OAuth\SignatureMethod;
+
+/**
+ * Create concrete class from abstract SignatureMethod.
+ *
+ * Have to define two methods which are abstract in SignatureMethod.
+ */
+class FooBarSignatureMethod extends SignatureMethod
+{
+    public function getName() {
+    }
+
+    public function buildSignature(
+        \GaryJones\OAuth\Request $request,
+        \GaryJones\OAuth\Client $client,
+        \GaryJones\OAuth\Token $token = null
+    ) {
+    }
+}
+
+class SignatureTest extends PHPUnit_Framework_TestCase
+{
+    public function tearDown()
+    {
+        m::close();
+    }
+
+    public function testGetSignatureKeyWithoutToken()
+    {
+        // Create instance of class to test, with mock objects passed in.
+        $signature_method = $this->getSignatureMethod();
+
+        // Get mock objects
+        $client = $this->getClient();
+
+        // Run method being tested
+        $signature_key = $signature_method->getSignatureKey($client);
+
+        // Check results
+        $this->assertEquals('secret&', $signature_key);
+    }
+
+    public function testGetSignatureKeyWithToken()
+    {
+        // Create instance of class to test, with mock objects passed in.
+        $signature_method = $this->getSignatureMethod();
+
+        // Get mock objects
+        $client = $this->getClient();
+        $token = $this->getToken();
+
+        // Run method being tested
+        $signature_key = $signature_method->getSignatureKey($client, $token);
+
+        // Check results
+        $this->assertEquals('secret&token_secret', $signature_key);
+    }
+
+    private function getSignatureMethod()
+    {
+        return new FooBarSignatureMethod;
+    }
+
+    private function getClient()
+    {
+        return m::mock('GaryJones\OAuth\Client', function ($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');
+        });
+    }
+}