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: key_auth_test.go
    path of file: ./repos/go-starter-kit/vendor/github.com/labstack/echo/middleware
    
    the code of the file until where you have to start completion: package middleware

import (
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/labstack/echo"
	"github.com/stretchr/testify/assert"
)

func TestKeyAuth(t *testing.T) {
	e := echo.New()
	req, _ := http.NewRequest(echo.GET, "/", nil)
	res := httptest.NewRecorder()
	c := e.NewContext(req, res)
	config := KeyAuthConfig{
		Validator: func(key string, c echo.Context) bool {
			return key == "valid-key"
		},
	}
	h := KeyAuthWithConfig(config)(func(c 
    
func TestKeyAuth(t *testing.T) {
	e := echo.New()
	req, _ := http.NewRequest(echo.GET, "/", nil)
	res := httptest.NewRecorder()
	c := e.NewContext(req, res)
	config := KeyAuthConfig{
		Validator: func(key string, c echo.Context) bool {
			return key == "valid-key"
		},
	}
	h := KeyAuthWithConfig(config)(func(c echo.Context) error {
		return c.String(http.StatusOK, "test")
	})

	// Valid key
	auth := DefaultKeyAuthConfig.AuthScheme + " " + "valid-key"
	req.Header.Set(echo.HeaderAuthorization, auth)
	assert.NoError(t, h(c))

	// Invalid key
	auth = DefaultKeyAuthConfig.AuthScheme + " " + "invalid-key"
	req.Header.Set(echo.HeaderAuthorization, auth)
	he := h(c).(*echo.HTTPError)
	assert.Equal(t, http.StatusUnauthorized, he.Code)

	// Missing Authorization header
	req.Header.Del(echo.HeaderAuthorization)
	he = h(c).(*echo.HTTPError)
	assert.Equal(t, http.StatusBadRequest, he.Code)

	// Key from custom header
	config.KeyLookup = "header:API-Key"
	h = KeyAuthWithConfig(config)(func(c echo.Context) error {
		return c.String(http.StatusOK, "test")
	})
	req.Header.Set("API-Key", "valid-key")
	assert.NoError(t, h(c))

	// Key from query string
	config.KeyLookup = "query:key"
	h = KeyAuthWithConfig(config)(func(c echo.Context) error {
		return c.String(http.StatusOK, "test")
	})
	q := req.URL.Query()
	q.Add("key", "valid-key")
	req.URL.RawQuery = q.Encode()
	assert.NoError(t, h(c))
}