public void GetAllTransformations()
{
Assert.That(_registry.GetAllTransformations(ExpressionType.Constant), Is.Empty);
var transformerStub1 = CreateTransformerStub <Expression> (1, ExpressionType.Constant);
_registry.Register(transformerStub1);
var transformerStub2 = CreateTransformerStub <Expression> (1, ExpressionType.Constant);
_registry.Register(transformerStub2);
var transformerStub3 = CreateTransformerStub <Expression> (1, ExpressionType.Equal);
_registry.Register(transformerStub3);
var transformationsForConstant = _registry.GetAllTransformations(ExpressionType.Constant);
Assert.That(GetTransformersFromTransformations(transformationsForConstant), Is.EqualTo(new[] { transformerStub1, transformerStub2 }));
var transformationsForEqual = _registry.GetAllTransformations(ExpressionType.Equal);
Assert.That(GetTransformersFromTransformations(transformationsForEqual), Is.EqualTo(new[] { transformerStub3 }));
}