[TASK] Do not assertX but fail() in tearDown() (#660)

phpunit has a best practice that tests should usually
have at least one assertion to be sure they actually
do something. All assertions thus raise a counter that
is checked after test execution. If zero, phpunit marks
the test risky with "test has no assertion".

There are two ways to suppress this:
* Setting beStrictAboutTestsThatDoNotTestAnything="false"
  via phpunit config
* Adding #[DoesNotPerformAssertions] attribute to single
  tests to actively mark tests that do not assert something
  as legit

Our abstract UnitTestCase spoils this by always doing
assertions in tearDown(). The patch turns these
assertions into check+fail() code instead. Unit tests that
don't have assertions for whatever reason are now properly
marked as risky as intended by phpunit.

Releases: main

Author: lolli42

Classes/Core/Unit/UnitTestCase.php

@@ -127,12 +127,13 @@ protected function tearDown(): void
             $singletonInstances = GeneralUtility::getSingletonInstances();
             // Reset singletons anyway to not let all further tests fail
             GeneralUtility::resetSingletonInstances([]);
-            self::assertEmpty(
-                $singletonInstances,
-                'tearDown() integrity check found left over singleton instances in GeneralUtility::makeInstance()'
-                . ' instance list. The test should probably set \'$this->resetSingletonInstances = true;\' to'
-                . ' reset this framework state change. Found singletons: ' . implode(', ', array_keys($singletonInstances))
-            );
+            if (!empty($singletonInstances)) {
+                self::fail(
+                    'tearDown() integrity check found left over singleton instances in GeneralUtility::makeInstance()'
+                    . ' instance list. The test should probably set \'$this->resetSingletonInstances = true;\' to'
+                    . ' reset this framework state change. Found singletons: ' . implode(', ', array_keys($singletonInstances))
+                );
+            }
         }
 
         // Delete registered test files and directories
@@ -175,18 +176,19 @@ protected function tearDown(): void
         if (!empty($notCleanInstances)) {
             // Reset instance list (including singletons & container) to not let all further tests fail
             GeneralUtility::purgeInstances();
+            self::fail(
+                'tearDown() integrity check found left over instances in GeneralUtility::makeInstance() instance list.'
+                . ' Always consume instances added via GeneralUtility::addInstance() in your test by the test subject.'
+                . ' Found instances of these classes: ' . implode(', ', array_keys($notCleanInstances))
+            );
         }
-        // Let the test fail if there were instances left and give some message on why it fails
-        self::assertEquals(
-            [],
-            $notCleanInstances,
-            'tearDown() integrity check found left over instances in GeneralUtility::makeInstance() instance list.'
-            . ' Always consume instances added via GeneralUtility::addInstance() in your test by the test subject.'
-        );
 
-        self::assertTrue($this->setUpMethodCallChainValid, 'tearDown() integrity check detected that setUp has a '
-            . 'broken parent call chain. Please check that setUp() methods properly calls parent::setUp(), starting from "'
-            . static::class . '"');
+        if ($this->setUpMethodCallChainValid === false) {
+            self::fail(
+                'tearDown() integrity check detected that setUp() has a broken parent call chain.'
+                . ' Please check that setUp() methods properly calls parent::setUp(), starting from "' . static::class . '"'
+            );
+        }
 
         parent::tearDown();
     }