FooTypeBarExtension example

    public function testFailIfUnregisteredTypeNoFormType()
    {
        $this->expectException(InvalidArgumentException::class);
        $this->registry->getType('stdClass');
    }

    public function testGetTypeWithTypeExtensions()
    {
        $type = new FooType();
        $ext1 = new FooTypeBarExtension();
        $ext2 = new FooTypeBazExtension();

        $this->extension2->addType($type);
        $this->extension1->addTypeExtension($ext1);
        $this->extension2->addTypeExtension($ext2);

        $resolvedFormType = $this->registry->getType(FooType::class);

        $this->assertInstanceOf(ResolvedFormType::class, $resolvedFormType);
        $this->assertSame($type, $resolvedFormType->getInnerType());
        $this->assertSame([$ext1, $ext2], $resolvedFormType->getTypeExtensions());
    }