WebRequest: Fix flaky testGetElapsedTime test case

* Increase tolerance from 0.2s to 60s.

* Update mock to only set 'requestTime' when needed.

* Inject the mock timestamp.

* Increase test coverage by not just ensuring 0.0 is returned
  when invoked right after (which would be satisfied if it
  always returned 0.0), but use a timestamp that started
  slightly in the past to confirm it does (likely) do
  computation.

Bug: T199764
Change-Id: Iad9499391eecb4a9d1923d231a1a5f1afe173ecc

diff --git a/tests/phpunit/includes/WebRequestTest.php b/tests/phpunit/includes/WebRequestTest.php
index 9583921..07c307e 100644 (file)
--- a/tests/phpunit/includes/WebRequestTest.php
+++ b/tests/phpunit/includes/WebRequestTest.php
@@ -123,7 +123,13 @@ class WebRequestTest extends MediaWikiTestCase {
                ];
        }
 
-       protected function mockWebRequest( $data = [] ) {
+       /**
+        * @param array $data Request data
+        * @param array $config
+        *  - float 'requestTime': Mock value for `$_SERVER['REQUEST_TIME_FLOAT']`.
+        * @return WebRequest
+        */
+       protected function mockWebRequest( array $data = [], array $config = [] ) {
                // Cannot use PHPUnit getMockBuilder() as it does not support
                // overriding protected properties afterwards
                $reflection = new ReflectionClass( WebRequest::class );
@@ -133,9 +139,11 @@ class WebRequestTest extends MediaWikiTestCase {
                $prop->setAccessible( true );
                $prop->setValue( $req, $data );
 
-               $prop = $reflection->getProperty( 'requestTime' );
-               $prop->setAccessible( true );
-               $prop->setValue( $req, microtime( true ) );
+               if ( isset( $config['requestTime'] ) ) {
+                       $prop = $reflection->getProperty( 'requestTime' );
+                       $prop->setAccessible( true );
+                       $prop->setValue( $req, $config['requestTime'] );
+               }
 
                return $req;
        }
@@ -144,9 +152,11 @@ class WebRequestTest extends MediaWikiTestCase {
         * @covers WebRequest::getElapsedTime
         */
        public function testGetElapsedTime() {
-               $req = $this->mockWebRequest();
-               $this->assertGreaterThanOrEqual( 0.0, $req->getElapsedTime() );
-               $this->assertEquals( 0.0, $req->getElapsedTime(), '', /*delta*/ 0.2 );
+               $now = microtime( true ) - 10.0;
+               $req = $this->mockWebRequest( [], [ 'requestTime' => $now ] );
+               $this->assertGreaterThanOrEqual( 10.0, $req->getElapsedTime() );
+               // Catch common errors, but don't fail on slow hardware or VMs (T199764).
+               $this->assertEquals( 10.0, $req->getElapsedTime(), '', 60.0 );
        }
 
        /**