MDL-40207 simplepie: reduce false failures in unit tests

The simplepie tests time out too quickly due to a low connect timeout,
to fix this, I converted the unit tests to use a high timeout value.

lib/tests/rsslib_test.php

@@ -43,14 +43,18 @@ class moodlesimplepie_testcase extends basic_testcase {
     const INVALIDURL = 'http://download.moodle.org/unittest/rsstest-which-doesnt-exist.xml';
     # This tinyurl redirects to th rsstest.xml file
     const REDIRECTURL = 'http://tinyurl.com/lvyslv';
+    # The number of seconds tests should wait for the server to respond (high to prevent false positives).
+    const TIMEOUT = 10;
 
     function setUp() {
         moodle_simplepie::reset_cache();
     }
 
     function test_getfeed() {
-        $feed = new moodle_simplepie(self::VALIDURL);
-
+        $feed = new moodle_simplepie();
+        $feed->set_timeout(self::TIMEOUT);
+        $feed->set_feed_url(self::VALIDURL);
+        $feed->init();
         $this->assertInstanceOf('moodle_simplepie', $feed);
 
         $this->assertNull($feed->error(), "Failed to load the sample RSS file. Please check your proxy settings in Moodle. %s");
@@ -108,7 +112,10 @@ function test_getfeed() {
      * Test retrieving a url which doesn't exist
      */
     function test_failurl() {
-        $feed = @new moodle_simplepie(self::INVALIDURL); // we do not want this in php error log
+        $feed = new moodle_simplepie();
+        $feed->set_timeout(self::TIMEOUT);
+        $feed->set_feed_url(self::INVALIDURL);
+        @$feed->init(); // We do not want this in php error log.
 
         $this->assertNotEmpty($feed->error());
     }
@@ -135,7 +142,10 @@ function test_failproxy() {
     function test_redirect() {
         global $CFG;
 
-        $feed = new moodle_simplepie(self::REDIRECTURL);
+        $feed = new moodle_simplepie();
+        $feed->set_timeout(self::TIMEOUT);
+        $feed->set_feed_url(self::REDIRECTURL);
+        $feed->init();
 
         $this->assertNull($feed->error());
         $this->assertEquals($feed->get_title(), 'Moodle News');