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: drainer_test.go
    path of file: ./repos/atlantis/server/events
    
    the code of the file until where you have to start completion: package events_test

import (
	"context"
	"testing"
	"time"

	"github.com/runatlantis/atlantis/server/events"
	. "github.com/runatlantis/atlantis/testing"
)

// Test starting and completing ops.
func TestDrainer(t *testing.T) {
	d := events.Drainer{}

	// Starts at 0.
	Equals(t, 0, d.GetStatus().InProgressOps)

	// Add 1.
	d.StartOp()
	Equals(t, 1, d.GetStatus().InProgressOps)

	// Remove 1.
	d.OpDone()
	Equals(t, 0, d.GetStatus().InProgressOps)

	// Add 2.
	d.StartOp()
	d.StartOp()
	Equals(t, 2, d.GetStatus().InProgressOps)

	// Remove 1.
	d.OpDone()
	Equals(t, 1, d.GetStatus().InProgressOps)
}

func T
    
func TestDrainer_Shutdown(t *testing.T) {
	d := events.Drainer{}
	d.StartOp()

	shutdown := make(chan bool)
	go func() {
		d.ShutdownBlocking()
		close(shutdown)
	}()

	// Sleep to ensure that ShutdownBlocking has been called.
	time.Sleep(300 * time.Millisecond)

	// Starting another op should fail.
	Equals(t, false, d.StartOp())

	// Status should be shutting down.
	Equals(t, events.DrainStatus{
		ShuttingDown:  true,
		InProgressOps: 1,
	}, d.GetStatus())

	// Stop the final operation and wait for shutdown to exit.
	d.OpDone()
	timer, cancel := context.WithTimeout(context.Background(), 1*time.Second)
	defer cancel()
	select {
	case <-shutdown:
	case <-timer.Done():
		Assert(t, false, "Timer reached without shutdown")

	}
}