FakeKernelPluginLoader example

$this->cacheItemPoolInterfaceMock->method('getItem')->willReturn(new CacheItem());

        $kernelMock = $this->createMock(Kernel::class);
        $containerMock = $this->createMock(Container::class);
        $containerMock->method('getParameter')->with('kernel.plugin_dir')->willReturn('tmp');
        $containerMock->method('get')->willReturn($this->eventDispatcher);
        $kernelMock->method('getContainer')->willReturn($containerMock);
        $this->containerMock
            ->expects(static::exactly(2))
            ->method('get')->willReturnOnConsecutiveCalls(
                $kernelMock,
                new FakeKernelPluginLoader(
                    [
                        [
                            'baseClass' => 'MockPlugin',
                            'active' => false,
                        ],
                    ]
                )
            );

        $this->pluginLifecycleService->activatePlugin($pluginEntityMock, $context);
    }