Initialize CMS application scaffold

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

internal/service/auth_test.go

@@ -0,0 +1,39 @@
+package service
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/example/cms/internal/domain"
+	"github.com/example/cms/internal/identity"
+)
+
+type fakeUsers struct{}
+
+func (fakeUsers) FindOrCreateByIdentity(_ context.Context, u domain.User) (domain.User, error) {
+	u.ID = 7
+	return u, nil
+}
+
+type fakeAdmins struct{}
+
+func (fakeAdmins) FindByEmail(context.Context, string) (domain.Admin, error) {
+	return domain.Admin{ID: 2, Email: "admin@example.com"}, nil
+}
+
+type fakeSessions struct{ created domain.Session }
+
+func (f *fakeSessions) Create(_ context.Context, s domain.Session) error { f.created = s; return nil }
+func (f *fakeSessions) FindValid(context.Context, string) (domain.Session, error) {
+	return f.created, nil
+}
+
+func TestAuthServiceCreatesUserSession(t *testing.T) {
+	sessions := &fakeSessions{}
+	s := NewAuthService(fakeUsers{}, fakeAdmins{}, sessions, time.Hour)
+	u, token, err := s.Login(context.Background(), identity.Identity{Subject: "sub", Email: "user@example.com"})
+	if err != nil || token == "" || u.ID != 7 || sessions.created.UserID == nil {
+		t.Fatalf("login failed: user=%+v token=%q session=%+v err=%v", u, token, sessions.created, err)
+	}
+}