Updated unit tests for SMB

- coverage for touch return value
- fixed directory provider to exclude unsupported cases

apps/files_external/tests/smb.php

@@ -29,6 +29,11 @@ class SMB extends Storage {
 		}
 	}
 
+	public function directoryProvider() {
+		// doesn't support leading/trailing spaces
+		return array(array('folder'));
+	}
+
 	public function testRenameWithSpaces() {
 		$this->instance->mkdir('with spaces');
 		$result = $this->instance->rename('with spaces', 'foo bar');

tests/lib/files/storage/storage.php

@@ -236,7 +236,8 @@ abstract class Storage extends \PHPUnit_Framework_TestCase {
 
 	public function testTouchCreateFile() {
 		$this->assertFalse($this->instance->file_exists('foo'));
-		$this->instance->touch('foo');
+		// returns true on success
+		$this->assertTrue($this->instance->touch('foo'));
 		$this->assertTrue($this->instance->file_exists('foo'));
 	}