Refactored the application structure to better separate concerns between files and packages

internal/app/service_test.go

@@ -0,0 +1,100 @@
+// service_test.go validates application service delegation behavior.
+// Layer: internal/app tests for read use-case orchestration.
+package app
+
+import (
+	"context"
+	"errors"
+	"testing"
+
+	"gitea.maximumdirect.net/ejr/weatherfeeder/model"
+)
+
+type fakeRepository struct {
+	observation *model.WeatherObservation
+	forecast    *model.WeatherForecastRun
+	alerts      *model.WeatherAlertRun
+	conditions  *CurrentConditions
+	err         error
+
+	currentConditionsWindow int
+}
+
+func (r *fakeRepository) LatestObservation(context.Context) (*model.WeatherObservation, error) {
+	return r.observation, r.err
+}
+
+func (r *fakeRepository) LatestHourlyForecast(context.Context) (*model.WeatherForecastRun, error) {
+	return r.forecast, r.err
+}
+
+func (r *fakeRepository) LatestAlertRun(context.Context) (*model.WeatherAlertRun, error) {
+	return r.alerts, r.err
+}
+
+func (r *fakeRepository) CurrentConditions(_ context.Context, observationWindowMinutes int) (*CurrentConditions, error) {
+	r.currentConditionsWindow = observationWindowMinutes
+	return r.conditions, r.err
+}
+
+func TestServiceDelegatesObservation(t *testing.T) {
+	repo := &fakeRepository{observation: &model.WeatherObservation{StationID: "KSTL"}}
+	svc := NewService(repo)
+
+	obs, err := svc.LatestObservation(context.Background())
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if obs == nil || obs.StationID != "KSTL" {
+		t.Fatalf("unexpected observation: %+v", obs)
+	}
+}
+
+func TestServiceDelegatesForecast(t *testing.T) {
+	repo := &fakeRepository{forecast: &model.WeatherForecastRun{LocationID: "stl"}}
+	svc := NewService(repo)
+
+	run, err := svc.LatestHourlyForecast(context.Background())
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if run == nil || run.LocationID != "stl" {
+		t.Fatalf("unexpected forecast: %+v", run)
+	}
+}
+
+func TestServiceDelegatesAlerts(t *testing.T) {
+	repo := &fakeRepository{alerts: &model.WeatherAlertRun{LocationID: "stl"}}
+	svc := NewService(repo)
+
+	run, err := svc.LatestAlertRun(context.Background())
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if run == nil || run.LocationID != "stl" {
+		t.Fatalf("unexpected alert run: %+v", run)
+	}
+}
+
+func TestServiceUsesDefaultCurrentConditionsWindow(t *testing.T) {
+	repo := &fakeRepository{conditions: &CurrentConditions{ConditionCode: model.WMOUnknown}}
+	svc := NewService(repo)
+
+	_, err := svc.CurrentConditions(context.Background())
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if repo.currentConditionsWindow != ObservationWindowMinutesDefault {
+		t.Fatalf("expected observation window %d, got %d", ObservationWindowMinutesDefault, repo.currentConditionsWindow)
+	}
+}
+
+func TestServicePropagatesErrors(t *testing.T) {
+	want := errors.New("boom")
+	repo := &fakeRepository{err: want}
+	svc := NewService(repo)
+
+	if _, err := svc.LatestObservation(context.Background()); !errors.Is(err, want) {
+		t.Fatalf("expected error %v, got %v", want, err)
+	}
+}