test(users): cover config, usecase error paths, and /me 500 path

users/internal/usecase/errorpaths_test.go

@@ -0,0 +1,103 @@
+package usecase_test
+
+import (
+	"context"
+	"errors"
+	"testing"
+	"time"
+
+	"github.com/google/uuid"
+
+	"github.com/emil28092005/SciMesh/users/internal/domain"
+	"github.com/emil28092005/SciMesh/users/internal/usecase"
+)
+
+// These stubs let a test inject failures the happy-path memstore never produces,
+// so the use cases' error branches are exercised too.
+
+var errBoom = errors.New("boom")
+
+type stubRepo struct {
+	getByEmail func() (*domain.User, error)
+	insert     func() error
+}
+
+func (s stubRepo) Insert(context.Context, *domain.User) error { return s.insert() }
+func (s stubRepo) GetByEmail(context.Context, string) (*domain.User, error) {
+	return s.getByEmail()
+}
+func (s stubRepo) GetByID(context.Context, uuid.UUID) (*domain.User, error) {
+	return nil, usecase.ErrUserNotFound
+}
+
+type stubHasher struct {
+	hashErr    error
+	compareErr error
+}
+
+func (s stubHasher) Hash(string) (string, error) {
+	if s.hashErr != nil {
+		return "", s.hashErr
+	}
+	return "hashed", nil
+}
+func (s stubHasher) Compare(string, string) error { return s.compareErr }
+
+type stubIssuer struct{ err error }
+
+func (s stubIssuer) Issue(uuid.UUID, domain.Role) (string, error) {
+	if s.err != nil {
+		return "", s.err
+	}
+	return "token", nil
+}
+
+func TestRegisterPropagatesHasherError(t *testing.T) {
+	clk := stubClock{time.Now()}
+	reg := usecase.NewRegister(stubRepo{}, stubHasher{hashErr: errBoom}, clk)
+
+	_, err := reg.Execute(context.Background(), "a@b.com", "password123")
+	if !errors.Is(err, errBoom) {
+		t.Errorf("got %v, want errBoom", err)
+	}
+}
+
+func TestRegisterPropagatesInsertError(t *testing.T) {
+	clk := stubClock{time.Now()}
+	repo := stubRepo{insert: func() error { return errBoom }}
+	reg := usecase.NewRegister(repo, stubHasher{}, clk)
+
+	_, err := reg.Execute(context.Background(), "a@b.com", "password123")
+	if !errors.Is(err, errBoom) {
+		t.Errorf("got %v, want errBoom", err)
+	}
+}
+
+func TestLoginPropagatesRepoError(t *testing.T) {
+	// A non-ErrUserNotFound repo error must surface as-is, not be masked as
+	// ErrInvalidCredentials.
+	repo := stubRepo{getByEmail: func() (*domain.User, error) { return nil, errBoom }}
+	login := usecase.NewLogin(repo, stubHasher{}, stubIssuer{})
+
+	_, _, err := login.Execute(context.Background(), "a@b.com", "password123")
+	if !errors.Is(err, errBoom) {
+		t.Errorf("got %v, want errBoom", err)
+	}
+}
+
+func TestLoginPropagatesIssuerError(t *testing.T) {
+	repo := stubRepo{getByEmail: func() (*domain.User, error) {
+		return &domain.User{ID: uuid.New(), Email: "a@b.com", Role: domain.RoleUser}, nil
+	}}
+	// Hasher accepts the password (nil compareErr) so we reach token issuance.
+	login := usecase.NewLogin(repo, stubHasher{}, stubIssuer{err: errBoom})
+
+	_, _, err := login.Execute(context.Background(), "a@b.com", "password123")
+	if !errors.Is(err, errBoom) {
+		t.Errorf("got %v, want errBoom", err)
+	}
+}
+
+type stubClock struct{ t time.Time }
+
+func (c stubClock) Now() time.Time { return c.t }