Infrastructure for obtaining temporary files.

tests/PhpseclibTestCase.php

@@ -7,6 +7,32 @@
 
 abstract class PhpseclibTestCase extends PHPUnit_Framework_TestCase
 {
+    protected $tempFilesToUnlinkOnTearDown = array();
+
+    public function tearDown()
+    {
+        foreach ($this->tempFilesToUnlinkOnTearDown as $filename) {
+            if (!file_exists($filename) || unlink($filename)) {
+                unset($this->tempFilesToUnlinkOnTearDown[$filename]);
+            }
+        }
+        parent::tearDown();
+    }
+
+    /**
+    * Creates a temporary file on the local filesystem and returns its path.
+    * All files created using this method will be deleted from the filesystem
+    * on tearDown(), i.e. after each test method was run.
+    *
+    * @return string
+    */
+    protected function createTempFile()
+    {
+        $filename = tempnam(sys_get_temp_dir(), 'phpseclib-test-');
+        $this->tempFilesToUnlinkOnTearDown[] = $filename;
+        return $filename;
+    }
+
     /**
     * @param string $constant
     * @param mixed $expected