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: api_test.go
    path of file: ./repos/gluetun/internal/provider/ivpn/updater
    
    the code of the file until where you have to start completion: package updater

import (
	"context"
	"errors"
	"io"
	"net/http"
	"strings"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func Test_fetchAPI(t *testing.T) {
	t.Parallel()

	testCases := map[string]struct {
		responseStatus int
		responseBody   io.ReadCloser
		data           apiData
		err            error
	}{
		"http response status not ok": {
			responseStatus: http.StatusNoContent,
			err:            errors.New("HTTP status code not OK: 204 No Content"),
		},
		"nil body": {
			responseStatus: http.StatusOK,
			err:            errors.New("decoding response body: EOF"),
		},
		"no server": {
			responseStatus: http.StatusOK,
			responseBody:   io.NopCloser(strings.NewReader(`{}`)),
		},
		"success": {
			responseStatus: http.StatusOK,
			responseBody: io.NopCloser(strings.NewReader(`{"servers":[
				{"country":"Country1","city":"City A","isp":"xyz","is_active":true,"hostnames":{"openvpn":"hosta"}},
				{"country":"Country2","city":"City B","isp":"abc","is_active":false,"hostnames":{"openvpn":"hostb"}}
			]}`)),
			data: apiData{
				Servers: []apiServer{
					{
						Country:  "Country1",
						City:     "City A",
						IsActive: true,
						ISP:      "xyz",
						Hostnames: apiHostnames{
							OpenVPN: "hosta",
						},
	
    
func Test_fetchAPI(t *testing.T) {
	t.Parallel()

	testCases := map[string]struct {
		responseStatus int
		responseBody   io.ReadCloser
		data           apiData
		err            error
	}{
		"http response status not ok": {
			responseStatus: http.StatusNoContent,
			err:            errors.New("HTTP status code not OK: 204 No Content"),
		},
		"nil body": {
			responseStatus: http.StatusOK,
			err:            errors.New("decoding response body: EOF"),
		},
		"no server": {
			responseStatus: http.StatusOK,
			responseBody:   io.NopCloser(strings.NewReader(`{}`)),
		},
		"success": {
			responseStatus: http.StatusOK,
			responseBody: io.NopCloser(strings.NewReader(`{"servers":[
				{"country":"Country1","city":"City A","isp":"xyz","is_active":true,"hostnames":{"openvpn":"hosta"}},
				{"country":"Country2","city":"City B","isp":"abc","is_active":false,"hostnames":{"openvpn":"hostb"}}
			]}`)),
			data: apiData{
				Servers: []apiServer{
					{
						Country:  "Country1",
						City:     "City A",
						IsActive: true,
						ISP:      "xyz",
						Hostnames: apiHostnames{
							OpenVPN: "hosta",
						},
					},
					{
						Country: "Country2",
						City:    "City B",
						ISP:     "abc",
						Hostnames: apiHostnames{
							OpenVPN: "hostb",
						},
					},
				},
			},
		},
	}
	for name, testCase := range testCases {
		testCase := testCase
		t.Run(name, func(t *testing.T) {
			t.Parallel()

			ctx := context.Background()

			client := &http.Client{
				Transport: roundTripFunc(func(r *http.Request) (*http.Response, error) {
					assert.Equal(t, http.MethodGet, r.Method)
					assert.Equal(t, r.URL.String(), "https://api.ivpn.net/v4/servers/stats")
					return &http.Response{
						StatusCode: testCase.responseStatus,
						Status:     http.StatusText(testCase.responseStatus),
						Body:       testCase.responseBody,
					}, nil
				}),
			}

			data, err := fetchAPI(ctx, client)

			assert.Equal(t, testCase.data, data)
			if testCase.err != nil {
				require.Error(t, err)
				assert.Equal(t, testCase.err.Error(), err.Error())
			} else {
				assert.NoError(t, err)
			}
		})
	}
}