You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: example_cache_plugin_test.go
    path of file: ./repos/benthos/public/service
    
    the code of the file until where you have to start completion: package service_test

import (
	"context"
	"time"

	"github.com/benthosdev/benthos/v4/public/service"

	// Import only pure Benthos components, switch with `components/all` for all
	// standard components.
	_ "github.com/benthosdev/benthos/v4/public/components/pure"
)

// LossyCache is a terrible cache example and silently drops items when the
// capacity is reached. It also doesn't respect TTLs.
type LossyC
    
func Example_cachePlugin() {
	configSpec := service.NewConfigSpec().
		Summary("Creates a terrible cache with a fixed capacity.").
		Field(service.NewIntField("capacity").Default(100))

	err := service.RegisterCache("lossy", configSpec,
		func(conf *service.ParsedConfig, mgr *service.Resources) (service.Cache, error) {
			capacity, err := conf.FieldInt("capacity")
			if err != nil {
				return nil, err
			}
			return &LossyCache{
				capacity: capacity,
				mDropped: mgr.Metrics().NewCounter("dropped_just_cus"),
				items:    make(map[string][]byte, capacity),
			}, nil
		})
	if err != nil {
		panic(err)
	}

	// And then execute Benthos with:
	// service.RunCLI(context.Background())
}