test: Add unit and integration tests for API and storage

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/internal/api/mocks_test.go

@@ -0,0 +1,97 @@
+package api
+
+import (
+	"context"
+
+	"training-tracker/internal/models"
+)
+
+// mockExerciseRepo is a mock implementation of ExerciseRepository for testing
+type mockExerciseRepo struct {
+	exercises []models.Exercise
+	exercise  *models.Exercise
+	err       error
+	deleteErr error
+}
+
+func (m *mockExerciseRepo) List(ctx context.Context) ([]models.Exercise, error) {
+	return m.exercises, m.err
+}
+
+func (m *mockExerciseRepo) GetByID(ctx context.Context, id int64) (*models.Exercise, error) {
+	return m.exercise, m.err
+}
+
+func (m *mockExerciseRepo) Create(ctx context.Context, req *models.CreateExerciseRequest) (*models.Exercise, error) {
+	return m.exercise, m.err
+}
+
+func (m *mockExerciseRepo) Update(ctx context.Context, id int64, req *models.CreateExerciseRequest) (*models.Exercise, error) {
+	return m.exercise, m.err
+}
+
+func (m *mockExerciseRepo) Delete(ctx context.Context, id int64) error {
+	return m.deleteErr
+}
+
+// mockPlanRepo is a mock implementation of PlanRepository for testing
+type mockPlanRepo struct {
+	plans     []models.TrainingPlan
+	plan      *models.TrainingPlan
+	err       error
+	deleteErr error
+}
+
+func (m *mockPlanRepo) List(ctx context.Context) ([]models.TrainingPlan, error) {
+	return m.plans, m.err
+}
+
+func (m *mockPlanRepo) GetByID(ctx context.Context, id int64) (*models.TrainingPlan, error) {
+	return m.plan, m.err
+}
+
+func (m *mockPlanRepo) Create(ctx context.Context, req *models.CreatePlanRequest) (*models.TrainingPlan, error) {
+	return m.plan, m.err
+}
+
+func (m *mockPlanRepo) Update(ctx context.Context, id int64, req *models.CreatePlanRequest) (*models.TrainingPlan, error) {
+	return m.plan, m.err
+}
+
+func (m *mockPlanRepo) Delete(ctx context.Context, id int64) error {
+	return m.deleteErr
+}
+
+// mockSessionRepo is a mock implementation of SessionRepository for testing
+type mockSessionRepo struct {
+	sessions  []models.Session
+	session   *models.Session
+	entry     *models.SessionEntry
+	err       error
+	deleteErr error
+	entryErr  error
+}
+
+func (m *mockSessionRepo) List(ctx context.Context) ([]models.Session, error) {
+	return m.sessions, m.err
+}
+
+func (m *mockSessionRepo) GetByID(ctx context.Context, id int64) (*models.Session, error) {
+	return m.session, m.err
+}
+
+func (m *mockSessionRepo) Create(ctx context.Context, req *models.CreateSessionRequest) (*models.Session, error) {
+	return m.session, m.err
+}
+
+func (m *mockSessionRepo) Update(ctx context.Context, id int64, req *models.CreateSessionRequest) (*models.Session, error) {
+	return m.session, m.err
+}
+
+func (m *mockSessionRepo) Delete(ctx context.Context, id int64) error {
+	return m.deleteErr
+}
+
+func (m *mockSessionRepo) AddEntry(ctx context.Context, sessionID int64, req *models.CreateSessionEntryRequest) (*models.SessionEntry, error) {
+	return m.entry, m.entryErr
+}