add smoketest for calsub return data

calsub/http.go

@@ -137,6 +137,9 @@ func (s *Store) ServeICalData(w http.ResponseWriter, req *http.Request) {
 				UserURL:   cfg.CallbackURL("/users/" + s.UserID),
 			})
 		}
+		if len(data.Shifts) == 0 {
+			data.Shifts = []JSONShiftV1{}
+		}
 		w.Header().Set("Content-Type", "application/json")
 		err = json.NewEncoder(w).Encode(data)
 		if errutil.HTTPError(ctx, w, err) {

test/smoke/calendarsubscriptionjson_test.go

@@ -0,0 +1,113 @@
+package smoke
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"regexp"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"github.com/target/goalert/test/smoke/harness"
+)
+
+var (
+
+	// example: 2025-12-13T16:06:38.918293-06:00
+	isoRx     = regexp.MustCompile(`"\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(?:\.\d+)?(Z|[-+]\d{2}:\d{2})"`)
+	urlHostRx = regexp.MustCompile(`"http://[^/]+`)
+)
+
+func TestCalendarSubscriptionJSON(t *testing.T) {
+	t.Parallel()
+
+	const sql = `
+		insert into users (id, name, email)
+		values
+			({{uuid "user"}}, 'bob', 'joe');
+		insert into schedules (id, name, time_zone, description) 
+		values
+			({{uuid "schedId"}},'sched', 'America/Chicago', 'test description here');
+	`
+	h := harness.NewHarness(t, sql, "calendar-subscriptions")
+	defer h.Close()
+
+	doQL := func(query string, res interface{}) {
+		g := h.GraphQLQuery2(query)
+		for _, err := range g.Errors {
+			t.Error("GraphQL Error:", err.Message)
+		}
+		if len(g.Errors) > 0 {
+			t.Fatal("errors returned from GraphQL")
+		}
+		t.Log("Response:", string(g.Data))
+		if res == nil {
+			return
+		}
+		err := json.Unmarshal(g.Data, &res)
+		if err != nil {
+			t.Fatal("failed to parse response:", err)
+		}
+	}
+
+	var cs struct{ CreateUserCalendarSubscription struct{ URL string } }
+
+	const mut = `
+		mutation {
+			createUserCalendarSubscription (input: {
+				name: "%s",
+				reminderMinutes: [%d]
+				scheduleID: "%s",
+			}) {
+				url
+			}
+		}
+	`
+
+	// create subscription
+	doQL(fmt.Sprintf(mut, "foobar", 5, h.UUID("schedId")), &cs)
+
+	u, err := url.Parse(cs.CreateUserCalendarSubscription.URL)
+	assert.NoError(t, err)
+	assert.Contains(t, u.Path, "/api/v2/calendar")
+
+	resp, err := http.Get(cs.CreateUserCalendarSubscription.URL)
+	require.NoError(t, err)
+	require.Equal(t, 200, resp.StatusCode, "serve iCalendar")
+
+	data, err := io.ReadAll(resp.Body)
+	require.NoError(t, err)
+
+	assert.Equal(t, "BEGIN:VCALENDAR\r\nPRODID:-//GoAlert//dev//EN\r\nVERSION:2.0\r\nCALSCALE:GREGORIAN\r\nMETHOD:PUBLISH\r\nEND:VCALENDAR\r\n", string(data))
+
+	req, err := http.NewRequest("GET", cs.CreateUserCalendarSubscription.URL, nil)
+	require.NoError(t, err)
+	req.Header.Set("Accept", "application/json")
+	resp, err = http.DefaultClient.Do(req)
+	require.NoError(t, err)
+	require.Equal(t, 200, resp.StatusCode, "serve JSON")
+	data, err = io.ReadAll(resp.Body)
+	require.NoError(t, err)
+
+	data = isoRx.ReplaceAll(data, []byte(`"2021-01-01T00:00:00Z"`))
+	data = urlHostRx.ReplaceAll(data, []byte(`"http://TEST_HOST`))
+
+	expected := fmt.Sprintf(`
+{
+"AppName": "GoAlert",
+"AppVersion": "dev",
+"Start": "2021-01-01T00:00:00Z",
+"End": "2021-01-01T00:00:00Z",
+"ScheduleID": "%s",
+"ScheduleName": "sched",
+"ScheduleURL": "http://TEST_HOST/schedules/%s",
+"Shifts":[],
+"Type": "calendar-subscription/v1"
+}
+`, h.UUID("schedId"), h.UUID("schedId"))
+
+	assert.JSONEq(t, expected, string(data))
+}