# Module: Azaion.Test.SecurityTest

## Purpose
xUnit tests for the `Security` encryption/decryption functionality.

## Public Interface

| Test | Description |
|------|-------------|
| `EncryptDecryptTest` | Round-trip encrypt/decrypt of a ~1 KB string; asserts decrypted output matches original |
| `EncryptDecryptLargeFileTest` | Round-trip encrypt/decrypt of a ~400 MB generated file; compares SHA-256 hashes of original and decrypted files |

## Internal Logic
- **EncryptDecryptTest**: creates a key via `Security.GetApiEncryptionKey`, encrypts a test string to a `MemoryStream`, decrypts back, compares with `FluentAssertions`.
- **EncryptDecryptLargeFileTest**: generates a large JSON file (4M numbers chunked), encrypts, decrypts to a new file, compares file hashes via `SHA256.HashDataAsync`.

Private helpers:
- `CompareFiles` — SHA-256 hash comparison of two files
- `CreateLargeFile` — generates a large file by serializing number dictionaries in 100K chunks
- `StringToStream` — converts a UTF-8 string to a `MemoryStream`

## Dependencies
- `Security` (encrypt/decrypt)
- `StreamExtensions.ConvertToString`
- `FluentAssertions`
- `Newtonsoft.Json`
- xUnit

## Consumers
None — test module.

## Data Models
None.

## Configuration
None.

## External Integrations
Local filesystem (creates/deletes `large.txt` and `large_decrypted.txt` during large file test).

## Security
None.

## Tests
This IS the test module.