class CachePreWarmerTest

class CachePreWarmerTest extends UnitTestCase {
    
    /**
     * @var \Drupal\Core\DependencyInjection\ClassResolverInterface|\PHPUnit\Framework\MockObject\MockObject
     */
    protected MockObject|ClassResolverInterface $classResolver;
    
    /**
     * @var \SplObjectStorage<\Drupal\Core\PreWarm\PreWarmableInterface|\PHPUnit\Framework\MockObject\MockObject>
     */
    protected \SplObjectStorage $warmedMap;
    public function testNoServices() : void {
        $classResolver = $this->createMock(ClassResolverInterface::class);
        $classResolver->expects($this->never())
            ->method('getInstanceFromDefinition');
        $prewarmer = new CachePreWarmer($classResolver, []);
        $this->assertFalse($prewarmer->preWarmOneCache());
        $this->assertFalse($prewarmer->preWarmAllCaches());
    }
    protected function setupCacheServices() : void {
        $this->classResolver = $this->createMock(ClassResolverInterface::class);
        $this->warmedMap = new \SplObjectStorage();
        for ($i = 0; $i < 4; $i++) {
            $serviceId = 'service' . $i;
            $serviceMock = $this->createMock(PrewarmableInterface::class);
            $this->warmedMap[$serviceMock] = 0;
            $serviceMock->method('preWarm')
                ->willReturnCallback(function () use ($serviceMock) {
                $this->warmedMap[$serviceMock] = 1 + $this->warmedMap[$serviceMock];
            });
            $returnMap[] = [
                $serviceId,
                $serviceMock,
            ];
        }
        $this->classResolver
            ->method('getInstanceFromDefinition')
            ->willReturnMap($returnMap);
    }
    
    /**
     * @covers ::preWarmOneCache
     */
    public function testPreWarmOnlyOne() : void {
        $this->setupCacheServices();
        $preWarmer = new CachePreWarmer($this->classResolver, [
            'service0',
            'service1',
            'service2',
            'service3',
        ]);
        $this->assertTrue($preWarmer->preWarmOneCache());
        $warmed = 0;
        foreach ($this->warmedMap as $service) {
            $warmed += $this->warmedMap[$service];
        }
        $this->assertEquals(1, $warmed);
    }
    
    /**
     * @covers ::preWarmOneCache
     */
    public function testPreWarmByOne() : void {
        $this->setupCacheServices();
        $preWarmer = new CachePreWarmer($this->classResolver, [
            'service0',
            'service1',
            'service2',
            'service3',
        ]);
        while ($preWarmer->preWarmOneCache()) {
        }
        foreach ($this->warmedMap as $service) {
            $this->assertEquals(1, $this->warmedMap[$service]);
        }
    }
    
    /**
     * @covers ::preWarmAllCaches
     */
    public function testPreWarmAll() : void {
        $this->setupCacheServices();
        $preWarmer = new CachePreWarmer($this->classResolver, [
            'service0',
            'service1',
            'service2',
            'service3',
        ]);
        $this->assertTrue($preWarmer->preWarmAllCaches());
        foreach ($this->warmedMap as $service) {
            $this->assertEquals(1, $this->warmedMap[$service]);
        }
        $this->assertFalse($preWarmer->preWarmAllCaches());
    }

}