# Model Split Tests

**Task**: AZ-158_test_model_split
**Name**: Model Split Tests
**Description**: Implement 2 blackbox tests for model split storage — size constraint and reassembly integrity
**Complexity**: 1 point
**Dependencies**: AZ-152_test_infrastructure
**Component**: Blackbox Tests
**Jira**: AZ-158
**Epic**: AZ-151

## Problem

Encrypted models are split into small and big parts for CDN storage. Tests must verify the split respects size constraints and reassembly produces the original.

## Outcome

- 2 passing pytest tests in `tests/test_model_split.py`

## Scope

### Included
- BT-SPL-01: Split respects size constraint (small ≤ max(3072 bytes, 20% of total))
- BT-SPL-02: Reassembly produces original (small + big == encrypted bytes)

### Excluded
- CDN upload/download (requires external service)

## Acceptance Criteria

**AC-1: Size constraint**
Given 10000 encrypted bytes
When split into small + big
Then small ≤ max(3072, total × 0.2); big = remainder

**AC-2: Reassembly**
Given split parts from 10000 encrypted bytes
When small + big concatenated
Then equals original encrypted bytes

## Constraints

- Uses generated binary data (no fixture files needed)
- References SMALL_SIZE_KB constant from constants.py