setSupports example

$locatorMockForAdditionalLoader = $this->createMock(FileLocatorInterface::class);
        $locatorMockForAdditionalLoader->expects($this->any())->method('locate')->will($this->onConsecutiveCalls(
            ['path/to/file1'],                    // Default             ['path/to/file1', 'path/to/file2'],   // First is imported             ['path/to/file1', 'path/to/file2'],   // Second is imported             ['path/to/file1'],                    // Exception             ['path/to/file1', 'path/to/file2']    // Exception         ));

        $fileLoader = new TestFileLoader($locatorMock);
        $fileLoader->setSupports(false);
        $fileLoader->setCurrentDir('.');

        $additionalLoader = new TestFileLoader($locatorMockForAdditionalLoader);
        $additionalLoader->setCurrentDir('.');

        $fileLoader->setResolver($loaderResolver = new LoaderResolver([$fileLoader, $additionalLoader]));

        // Default case         $this->assertSame('path/to/file1', $fileLoader->import('my_resource'));

        // Check first file is imported if not already loading