Adds test to cover Api::guessMimeType() when given directory path.

Author: Potherca

src/Api.php

@@ -40,6 +40,8 @@ class Api implements ApiInterface
     const GITHUB_API_URL = 'https://api.github.com';
     const GITHUB_URL = 'https://github.com';
 
+    const MIME_TYPE_DIRECTORY = 'directory';
+
     /** @var Client */
     private $client;
     /** @var Contents */
@@ -301,7 +303,7 @@ final public function guessMimeType($path)
         $meta = $this->getMetaData($path);
 
         if ($this->hasKey($meta, self::KEY_TYPE) && $meta[self::KEY_TYPE] === self::KEY_DIRECTORY) {
-            $mimeType = 'directory'; //application/x-directory
+            $mimeType = self::MIME_TYPE_DIRECTORY; // or application/x-directory
         } else {
             $content = $this->getFileContents($path);
             $mimeType = MimeType::detectByContent($content);

tests/unit-tests/ApiTest.php

@@ -403,6 +403,41 @@ final public function testApiShouldUseFileContentsToGuessMimeTypeWhenExtensionUn
         self::assertEquals($expected, $actual);
     }
 
+    /**
+     * @covers ::guessMimeType
+     *
+     * @uses League\Flysystem\Util\MimeType
+     * @uses Potherca\Flysystem\Github\Api::getFileContents
+     * @uses Potherca\Flysystem\Github\Api::getMetaData
+     */
+    final public function testApiShouldGuessMimeTypeCorrectlyWhenGivenPathIsDirectory()
+    {
+        $api = $this->api;
+
+        $expected = $api::MIME_TYPE_DIRECTORY;
+
+        $mockVendor = 'vendor';
+        $mockPackage = 'package';
+        $mockReference = 'reference';
+
+        $this->prepareMockSettings([
+            'getVendor' => $mockVendor,
+            'getPackage' => $mockPackage,
+            'getReference' => $mockReference,
+        ]);
+
+        $this->prepareMockApi(
+            'show',
+            $api::API_REPO,
+            [$mockVendor, $mockPackage, self::MOCK_FOLDER_PATH, $mockReference],
+            [0 => [$api::KEY_TYPE => $api::MIME_TYPE_DIRECTORY]]
+        );
+
+        $actual = $api->guessMimeType(self::MOCK_FOLDER_PATH);
+
+        self::assertEquals($expected, $actual);
+    }
+
     /**
      * @uses Potherca\Flysystem\Github\Api::exists
      */