# Soniox Pro SDK - Test Coverage and Quality Assurance Analysis

**Date:** 2025-12-14
**Current Coverage:** 46.08%
**Status:** Needs Significant Improvement

---

## Executive Summary

The Soniox Pro SDK currently has **minimal test coverage at 46.08%**, with significant gaps in critical functionality including:
- HTTP client error handling and retry logic
- WebSocket real-time streaming
- Connection pool management
- Performance and load testing
- Integration tests
- Error recovery scenarios

**Critical Recommendation:** Implement comprehensive testing strategy with focus on performance, reliability, and production readiness.

---

## 1. Current Test Coverage Assessment

### 1.1 Coverage by Module

| Module | Statements | Missing | Branch Coverage | Coverage % | Status |
|--------|-----------|---------|-----------------|------------|--------|
| `__init__.py` | 10 | 0 | 0/0 | **100.00%** | ✅ Excellent |
| `types.py` | 190 | 2 | 2/2 | **98.96%** | ✅ Excellent |
| `config.py` | 55 | 8 | 9/16 | **78.87%** | ⚠️ Good |
| `errors.py` | 34 | 15 | 0/0 | **55.88%** | ⚠️ Fair |
| `async_client.py` | 15 | 7 | 0/0 | **53.33%** | ⚠️ Fair |
| `client.py` | 143 | 89 | 1/20 | **33.74%** | 🔴 Poor |
| `utils.py` | 35 | 25 | 0/12 | **21.28%** | 🔴 Poor |
| `realtime.py` | 118 | 90 | 0/26 | **19.44%** | 🔴 Critical |
| `cli.py` | 106 | 106 | 0/34 | **0.00%** | 🔴 Critical |

### 1.2 Test Files Analysis

**Existing Tests:**
- `/Users/behnamebrahimi/Developer/workspaces/soniox/tests/test_client.py` (48 lines, 5 tests)
- `/Users/behnamebrahimi/Developer/workspaces/soniox/tests/test_types.py` (92 lines, 7 tests)

**Total Tests:** 12 (10 passing, 2 failing)

**Missing Test Categories:**
- Unit tests for HTTP client operations
- Integration tests for API endpoints
- WebSocket streaming tests
- Performance and load tests
- Stress tests for large files
- Concurrent request tests
- Error recovery tests
- Retry logic tests

---

## 2. Critical Test Coverage Gaps

### 2.1 HTTP Client (`client.py`) - 33.74% Coverage

**Missing Coverage:**
```python
Lines 160-198: Request retry logic (CRITICAL)
Lines 210-235: Error response handling (CRITICAL)
Lines 267-278: File upload operations (HIGH)
Lines 369-381: Transcription creation (HIGH)
Lines 393-420: Transcription result retrieval (HIGH)
Lines 480-501: Polling logic for completion (CRITICAL)
```

**Impact:** Core functionality untested, production risks high.

### 2.2 WebSocket Realtime (`realtime.py`) - 19.44% Coverage

**Missing Coverage:**
```python
Lines 63-69: Audio sending with error handling (CRITICAL)
Lines 81-98: Finalise and keepalive requests (HIGH)
Lines 122-149: Response iteration and error handling (CRITICAL)
Lines 260-286: WebSocket connection management (CRITICAL)
Lines 312-328: File transcription workflow (HIGH)
```

**Impact:** Real-time streaming completely untested, WebSocket failures likely in production.

### 2.3 Utilities (`utils.py`) - 21.28% Coverage

**Missing Coverage:**
```python
Lines 32-33: Exponential backoff calculation (HIGH)
Lines 60-66: Retry-After header extraction (MEDIUM)
Lines 80-83: Audio source validation (HIGH)
Lines 112-129: Polling until complete (CRITICAL)
```

**Impact:** Retry and backoff logic untested, rate limiting may not work correctly.

### 2.4 CLI (`cli.py`) - 0.00% Coverage

**Missing Coverage:**
```
Complete CLI untested (LOW priority for SDK)
```

**Impact:** CLI tools unreliable, but lower priority than SDK core.

---

## 3. Performance Test Requirements

### 3.1 Load Testing Scenarios

**Not Currently Implemented - CRITICAL GAP**

#### Scenario 1: Concurrent Transcriptions
```python
# Test concurrent HTTP client usage
- 10, 50, 100, 500 concurrent transcription requests
- Measure: response time, success rate, connection pool exhaustion
- Expected: <5s response time at p95 for 100 concurrent requests
```

#### Scenario 2: Large File Handling
```python
# Test with audio files of varying sizes
- Small: 1-10 MB
- Medium: 10-50 MB
- Large: 50-100 MB
- Extra Large: 100-500 MB
- Measure: upload time, memory usage, timeout handling
- Expected: Handle 500MB files without timeout
```

#### Scenario 3: WebSocket Streaming Performance
```python
# Test real-time streaming throughput
- Stream duration: 1s, 10s, 60s, 300s
- Audio chunk sizes: 1KB, 4KB, 16KB, 64KB
- Measure: latency, token delivery time, buffer overflows
- Expected: <100ms latency for token delivery
```

#### Scenario 4: Connection Pool Stress Test
```python
# Test connection pool limits
- Max connections: 100 (default)
- Keep-alive connections: 20 (default)
- Scenario: Exhaust pool, verify queuing behaviour
- Expected: Graceful degradation, no crashes
```

### 3.2 Stress Testing Scenarios

**Not Currently Implemented - CRITICAL GAP**

#### Scenario 1: Rate Limiting Behaviour
```python
# Test rate limit handling
- Send requests at: 10/s, 50/s, 100/s, 500/s
- Verify: 429 error handling, backoff strategy
- Measure: retry success rate, backoff intervals
- Expected: Automatic backoff with exponential delay
```

#### Scenario 2: WebSocket Reconnection
```python
# Test connection resilience
- Simulate: Network interruptions, server disconnects
- Verify: Automatic reconnection, state preservation
- Expected: Seamless recovery without data loss
```

#### Scenario 3: Memory Stress Test
```python
# Test memory handling under load
- Upload 1000 files simultaneously
- Stream 100 concurrent WebSocket connections
- Measure: memory growth, garbage collection efficiency
- Expected: <2GB memory usage for 100 concurrent streams
```

### 3.3 Real-Time Performance Metrics

**Required Performance Benchmarks:**

| Metric | Target | Current | Status |
|--------|--------|---------|--------|
| API Response Time (p50) | <500ms | Unknown | ❌ Not Measured |
| API Response Time (p95) | <2s | Unknown | ❌ Not Measured |
| API Response Time (p99) | <5s | Unknown | ❌ Not Measured |
| WebSocket Latency | <100ms | Unknown | ❌ Not Measured |
| Max Concurrent Requests | 100+ | Unknown | ❌ Not Measured |
| Large File Upload (100MB) | <60s | Unknown | ❌ Not Measured |
| Connection Pool Efficiency | >95% | Unknown | ❌ Not Measured |
| Retry Success Rate | >90% | Unknown | ❌ Not Measured |

---

## 4. Test Quality Assessment

### 4.1 Existing Test Patterns

**Strengths:**
- ✅ Uses pytest framework
- ✅ Type hints in test functions
- ✅ Descriptive test names with docstrings
- ✅ Pydantic model validation tests
- ✅ Basic configuration tests

**Weaknesses:**
- ❌ **No mocking strategy** - tests fail without API key
- ❌ **No integration tests** - only basic unit tests
- ❌ **No fixtures** - duplicated setup code
- ❌ **No parametrised tests** - limited coverage of edge cases
- ❌ **No async tests** - despite async functionality
- ❌ **Failing tests** - 2 tests currently failing
- ❌ **No test isolation** - environment dependencies

### 4.2 Mocking Strategy Issues

**Current Problem:**
```python
# Tests fail without API key in environment
def test_client_requires_api_key() -> None:
    with pytest.raises(ValueError, match="API key is required"):
        SonioxClient()  # FAILS - API key loaded from .env
```

**Required:** Mock environment variables and HTTP responses for deterministic tests.

### 4.3 Test Isolation and Determinism

**Critical Issues:**
1. Tests depend on `.env` file presence
2. No HTTP response mocking (would require actual API)
3. No WebSocket mocking (would require actual server)
4. No connection pool isolation
5. Tests not idempotent (state leakage possible)

---

## 5. Missing Test Scenarios (Critical)

### 5.1 Connection Pool Exhaustion
```python
# NOT IMPLEMENTED
def test_connection_pool_exhaustion():
    """Test behaviour when connection pool is exhausted."""
    # Create client with small pool (max_connections=2)
    # Send 10 concurrent requests
    # Verify: requests queue properly, no crashes
    # Verify: pool recovers after requests complete
```

### 5.2 WebSocket Reconnection Scenarios
```python
# NOT IMPLEMENTED
def test_websocket_reconnect_on_disconnect():
    """Test automatic reconnection on connection drop."""
    # Start stream, send audio
    # Simulate network interruption
    # Verify: reconnection attempt
    # Verify: error raised with clear message

def test_websocket_reconnect_on_server_close():
    """Test reconnection when server closes connection."""
    # Start stream
    # Server sends close frame
    # Verify: clean shutdown, no hanging connections
```

### 5.3 Large File Handling (>100MB Audio)
```python
# NOT IMPLEMENTED
@pytest.mark.parametrize("file_size_mb", [1, 10, 50, 100, 200, 500])
def test_large_file_upload(file_size_mb):
    """Test uploading files of varying sizes."""
    # Generate test audio file of specified size
    # Upload file
    # Verify: successful upload, no timeout
    # Verify: memory usage remains reasonable
    # Measure: upload time, throughput
```

### 5.4 Concurrent API Calls
```python
# NOT IMPLEMENTED
@pytest.mark.parametrize("concurrency", [10, 50, 100])
def test_concurrent_transcription_requests(concurrency):
    """Test multiple simultaneous transcription requests."""
    # Upload multiple files
    # Create transcriptions concurrently
    # Verify: all succeed or fail gracefully
    # Measure: throughput, connection pool usage
```

### 5.5 Rate Limiting Behaviour
```python
# NOT IMPLEMENTED
def test_rate_limit_with_retry_after():
    """Test rate limit handling with Retry-After header."""
    # Mock 429 response with Retry-After: 60
    # Send request
    # Verify: SonioxRateLimitError raised
    # Verify: retry_after attribute set correctly

def test_rate_limit_automatic_backoff():
    """Test automatic exponential backoff on rate limits."""
    # Mock sequence: 429, 429, 200
    # Send request (should retry automatically)
    # Verify: eventual success
    # Verify: exponential delay between retries
```

### 5.6 Error Recovery Scenarios
```python
# NOT IMPLEMENTED
def test_timeout_with_retry():
    """Test timeout handling with automatic retry."""
    # Mock timeout on first 2 attempts, success on 3rd
    # Send request
    # Verify: automatic retry
    # Verify: eventual success

def test_connection_error_recovery():
    """Test connection error handling."""
    # Mock connection refused
    # Send request
    # Verify: SonioxConnectionError raised
    # Verify: connection pool not corrupted

def test_network_interruption_during_upload():
    """Test file upload interrupted by network failure."""
    # Start file upload
    # Simulate network interruption mid-upload
    # Verify: appropriate error raised
    # Verify: can retry upload
```

### 5.7 WebSocket Error Scenarios
```python
# NOT IMPLEMENTED
def test_websocket_server_error_response():
    """Test handling of server error in WebSocket stream."""
    # Start stream
    # Mock server error response (error_code != None)
    # Verify: SonioxWebSocketError raised
    # Verify: connection closed cleanly

def test_websocket_audio_send_failure():
    """Test audio send failure handling."""
    # Start stream
    # Mock send failure (network error)
    # Verify: SonioxWebSocketError raised
    # Verify: clear error message

def test_websocket_closed_stream_error():
    """Test sending to closed stream raises error."""
    # Create stream, close it
    # Attempt to send audio
    # Verify: SonioxWebSocketError raised
```

### 5.8 Polling and Waiting Scenarios
```python
# NOT IMPLEMENTED
def test_transcription_wait_timeout():
    """Test timeout when waiting for transcription."""
    # Create transcription
    # Mock status: always PROCESSING
    # Wait with timeout=5 seconds
    # Verify: SonioxTimeoutError raised

def test_transcription_wait_failure():
    """Test handling of failed transcription."""
    # Create transcription
    # Mock status: FAILED
    # Wait for completion
    # Verify: Exception raised with error message

def test_transcription_wait_success():
    """Test successful transcription completion."""
    # Mock sequence: PROCESSING, PROCESSING, COMPLETED
    # Wait for completion
    # Verify: TranscriptionResult returned
    # Verify: correct number of status checks
```

---

## 6. CI/CD Testing Analysis

### 6.1 Current GitHub Actions Workflow

**File:** `/Users/behnamebrahimi/Developer/workspaces/soniox/.github/workflows/test.yml`

**Strengths:**
- ✅ Multi-OS testing (Ubuntu, macOS, Windows)
- ✅ Multi-Python testing (3.12, 3.13)
- ✅ Linting with Ruff
- ✅ Type checking with mypy
- ✅ Coverage reporting to Codecov

**Weaknesses:**
- ❌ No performance regression testing
- ❌ No load testing in CI
- ❌ No integration tests (would require API credentials)
- ❌ No benchmarking suite
- ❌ Test execution time not measured
- ❌ No smoke tests for deployed packages

### 6.2 Test Execution Time

**Current Status:** Unknown (not measured)

**Recommendation:** Add test performance tracking

```yaml
# Add to .github/workflows/test.yml
- name: Run tests with timing
  run: |
    uv run pytest tests/ \
      --cov=soniox \
      --cov-report=xml \
      --cov-report=term \
      --durations=10 \
      --benchmark-only
```

### 6.3 Performance Regression Testing

**Not Currently Implemented**

**Recommendation:** Add pytest-benchmark

```yaml
# New workflow: .github/workflows/benchmark.yml
- name: Run performance benchmarks
  run: |
    uv run pytest tests/performance/ \
      --benchmark-only \
      --benchmark-json=benchmark.json

- name: Compare with baseline
  run: |
    uv run pytest-benchmark compare benchmark.json baseline.json
```

---

## 7. Specific Recommendations for Performance and Load Testing

### 7.1 Immediate Actions (Week 1)

1. **Set Up Test Infrastructure**
   ```bash
   # Add testing dependencies
   uv add --dev pytest-benchmark pytest-asyncio pytest-timeout pytest-xdist
   uv add --dev locust  # For load testing
   uv add --dev responses pytest-httpx  # For HTTP mocking
   uv add --dev pytest-websocket  # For WebSocket mocking
   ```

2. **Create Test Fixtures**
   - File: `/tests/conftest.py` (centralised fixtures)
   - Mock HTTP client with responses library
   - Mock WebSocket connections
   - Create test audio files of varying sizes
   - Environment variable isolation

3. **Fix Failing Tests**
   - Mock environment variable loading
   - Add `monkeypatch` fixture for API key tests
   - Ensure test isolation

### 7.2 Short-Term Implementation (Weeks 2-3)

#### Phase 1: Unit Test Completion
**Priority: CRITICAL**

Create comprehensive mocks and complete unit tests for:
- `client.py` - Target: 90%+ coverage
- `realtime.py` - Target: 90%+ coverage
- `utils.py` - Target: 100% coverage
- `errors.py` - Target: 100% coverage

**Files to Create:**
```
tests/unit/test_client_requests.py
tests/unit/test_client_retry_logic.py
tests/unit/test_client_error_handling.py
tests/unit/test_realtime_streaming.py
tests/unit/test_realtime_websocket.py
tests/unit/test_utils.py
tests/unit/test_errors.py
```

#### Phase 2: Integration Tests
**Priority: HIGH**

**Files to Create:**
```
tests/integration/test_file_upload_flow.py
tests/integration/test_transcription_flow.py
tests/integration/test_realtime_flow.py
tests/integration/test_auth_flow.py
```

**Note:** Requires test API credentials or recorded HTTP fixtures.

#### Phase 3: Performance Tests
**Priority: HIGH**

**Files to Create:**
```
tests/performance/test_http_client_performance.py
tests/performance/test_connection_pool_performance.py
tests/performance/test_large_file_performance.py
tests/performance/test_concurrent_requests.py
tests/performance/conftest.py  # Performance fixtures
```

**Example Performance Test:**
```python
import pytest
from soniox import SonioxClient

@pytest.mark.benchmark(group="client-init")
def test_client_initialization_performance(benchmark):
    """Benchmark client initialisation time."""
    def create_client():
        return SonioxClient(api_key="test-key")

    result = benchmark(create_client)
    assert result is not None
    # Target: <10ms for client init


@pytest.mark.benchmark(group="connection-pool")
def test_connection_pool_efficiency(benchmark, mock_api):
    """Benchmark connection pool reuse."""
    client = SonioxClient(api_key="test-key")

    def make_requests():
        # Make 100 requests, should reuse connections
        for _ in range(100):
            client.files.list()

    result = benchmark(make_requests)
    # Verify connection reuse (not 100 new connections)
    assert mock_api.connection_count < 25  # Should reuse from pool
```

### 7.3 Medium-Term Implementation (Week 4)

#### Load Testing Suite
**Priority: MEDIUM**

Create Locust-based load tests:

```python
# tests/load/locustfile.py
from locust import HttpUser, task, between

class SonioxLoadTest(HttpUser):
    wait_time = between(1, 3)

    def on_start(self):
        """Set up API authentication."""
        self.client.headers["Authorization"] = f"Bearer {API_KEY}"

    @task(3)
    def list_files(self):
        """Load test: List files endpoint."""
        self.client.get("/api/v1/files")

    @task(2)
    def create_transcription(self):
        """Load test: Create transcription."""
        self.client.post("/api/v1/transcriptions", json={
            "model": "stt-async-v3",
            "file_id": "test-file-id"
        })

    @task(1)
    def get_models(self):
        """Load test: Get models."""
        self.client.get("/api/v1/models")
```

**Run Load Tests:**
```bash
# Test with 100 concurrent users, spawn 10/sec
locust -f tests/load/locustfile.py \
  --users 100 \
  --spawn-rate 10 \
  --run-time 5m \
  --host https://api.soniox.com
```

#### Stress Testing Suite
**Priority: MEDIUM**

```python
# tests/stress/test_large_files.py
import pytest
from pathlib import Path

@pytest.mark.stress
@pytest.mark.parametrize("file_size_mb", [50, 100, 200, 500])
@pytest.mark.timeout(600)  # 10 minute timeout
def test_large_file_upload_stress(client, file_size_mb, tmp_path):
    """Stress test: Upload very large audio files."""
    # Generate test file
    test_file = tmp_path / f"audio_{file_size_mb}mb.mp3"
    generate_test_audio(test_file, size_mb=file_size_mb)

    # Upload and measure
    import time
    start = time.time()
    file = client.files.upload(str(test_file))
    duration = time.time() - start

    # Assertions
    assert file.id is not None
    assert duration < 600  # Should complete in 10 minutes
    print(f"Uploaded {file_size_mb}MB in {duration:.2f}s "
          f"({file_size_mb/duration:.2f} MB/s)")
```

### 7.4 Long-Term Implementation (Weeks 5-8)

#### Chaos Engineering Tests
**Priority: LOW**

Simulate failure scenarios:
- Network partitions
- DNS failures
- Slow network conditions
- Server overload (503 responses)
- Partial response corruption

#### Continuous Performance Monitoring

Integrate with CI/CD:
```yaml
# .github/workflows/performance.yml
name: Performance Regression Tests

on:
  pull_request:
    branches: [main]
  schedule:
    - cron: '0 0 * * *'  # Daily at midnight

jobs:
  benchmark:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Run benchmarks
        run: |
          uv run pytest tests/performance/ \
            --benchmark-only \
            --benchmark-json=output.json

      - name: Store benchmark result
        uses: benchmark-action/github-action-benchmark@v1
        with:
          tool: 'pytest'
          output-file-path: output.json
          fail-on-alert: true
          alert-threshold: '150%'  # Fail if 50% slower
```

---

## 8. Test Data Management Strategy

### 8.1 Test Audio Files

**Create Test Fixtures:**
```
tests/fixtures/
├── audio/
│   ├── small_1mb.mp3
│   ├── medium_10mb.mp3
│   ├── large_50mb.mp3
│   └── xlarge_100mb.mp3
├── responses/
│   ├── transcription_success.json
│   ├── transcription_failed.json
│   └── rate_limit_429.json
└── websocket/
    ├── streaming_responses.json
    └── error_responses.json
```

### 8.2 Mock Data Generators

```python
# tests/utils/generators.py
import io
import wave
import numpy as np

def generate_test_audio(duration_seconds: float, sample_rate: int = 16000) -> bytes:
    """Generate synthetic audio data for testing."""
    samples = int(duration_seconds * sample_rate)
    audio_data = (np.random.randint(-32768, 32767, samples, dtype=np.int16))

    buffer = io.BytesIO()
    with wave.open(buffer, 'wb') as wav_file:
        wav_file.setnchannels(1)
        wav_file.setsampwidth(2)
        wav_file.setframerate(sample_rate)
        wav_file.writeframes(audio_data.tobytes())

    return buffer.getvalue()
```

### 8.3 HTTP Response Mocking

```python
# tests/conftest.py
import pytest
import responses

@pytest.fixture
def mock_soniox_api():
    """Mock Soniox API responses."""
    with responses.RequestsMock() as rsps:
        # Mock file upload
        rsps.add(
            responses.POST,
            "https://api.soniox.com/api/v1/files",
            json={"file": {"id": "file-123", "name": "test.mp3"}},
            status=200
        )

        # Mock transcription creation
        rsps.add(
            responses.POST,
            "https://api.soniox.com/api/v1/transcriptions",
            json={"transcription": {"id": "trans-456", "status": "processing"}},
            status=200
        )

        yield rsps
```

---

## 9. Quality Metrics and Targets

### 9.1 Coverage Targets

| Category | Current | Target (3 months) | Target (6 months) |
|----------|---------|-------------------|-------------------|
| Overall Coverage | 46.08% | 80% | 90% |
| Unit Tests | 46.08% | 85% | 95% |
| Integration Tests | 0% | 60% | 80% |
| Performance Tests | 0% | 50% | 70% |
| Branch Coverage | Low | 75% | 85% |

### 9.2 Test Execution Targets

| Metric | Current | Target |
|--------|---------|--------|
| Total Unit Tests | 12 | 150+ |
| Total Integration Tests | 0 | 30+ |
| Total Performance Tests | 0 | 20+ |
| Test Execution Time | <2s | <30s |
| CI Test Time (full suite) | ~1min | <5min |

### 9.3 Quality Gates

**Required for Merge to Main:**
- ✅ All tests passing
- ✅ Coverage ≥80%
- ✅ No new critical security issues (Bandit)
- ✅ Type checking passes (mypy)
- ✅ Linting passes (Ruff)
- ✅ Performance benchmarks within 20% of baseline

---

## 10. Implementation Priority Matrix

### Critical (Implement Immediately)

1. **Fix Failing Tests** (2 tests failing)
   - Mock environment variables
   - Add proper test isolation

2. **HTTP Client Unit Tests** (client.py at 33.74%)
   - Retry logic tests
   - Error handling tests
   - Connection pool tests

3. **WebSocket Unit Tests** (realtime.py at 19.44%)
   - Streaming tests
   - Error handling tests
   - Reconnection tests

4. **Test Infrastructure**
   - Create `conftest.py` with fixtures
   - Add HTTP mocking
   - Add WebSocket mocking

### High Priority (Week 2-3)

5. **Performance Testing Framework**
   - Set up pytest-benchmark
   - Create baseline benchmarks
   - Add to CI/CD

6. **Integration Tests**
   - File upload flow
   - Transcription flow
   - Real-time streaming flow

7. **Utilities Coverage** (utils.py at 21.28%)
   - Backoff calculation tests
   - Polling logic tests

### Medium Priority (Week 4-6)

8. **Load Testing Suite**
   - Locust setup
   - Concurrent request tests
   - Connection pool stress tests

9. **Large File Testing**
   - 100MB+ file handling
   - Memory usage profiling
   - Timeout handling

10. **Error Recovery Tests**
    - Network interruption scenarios
    - Server error scenarios
    - Rate limiting scenarios

### Low Priority (Week 7-8)

11. **CLI Testing** (cli.py at 0%)
    - Basic CLI functionality
    - End-to-end CLI workflows

12. **Chaos Engineering**
    - Failure injection
    - Resilience testing

---

## 11. Recommended Testing Tools

### Core Testing
- ✅ **pytest** - Already configured
- ✅ **pytest-cov** - Already configured
- ➕ **pytest-benchmark** - For performance testing
- ➕ **pytest-timeout** - For timeout testing
- ➕ **pytest-xdist** - For parallel test execution

### Mocking
- ➕ **responses** - HTTP response mocking
- ➕ **pytest-httpx** - HTTPX client mocking
- ➕ **pytest-mock** - Already configured
- ➕ **faker** - Test data generation

### Performance & Load Testing
- ➕ **locust** - Load testing framework
- ➕ **pytest-benchmark** - Microbenchmarking
- ➕ **memory-profiler** - Memory usage tracking
- ➕ **py-spy** - Performance profiling

### WebSocket Testing
- ➕ **pytest-websocket** - WebSocket mocking
- ➕ **websocket-client** - For test clients

### Monitoring & Reporting
- ✅ **codecov** - Already configured
- ➕ **pytest-html** - HTML test reports
- ➕ **allure-pytest** - Advanced reporting

---

## 12. Conclusion

The Soniox Pro SDK requires **significant investment in testing infrastructure** to achieve production-ready quality standards. Current coverage of 46.08% is **insufficient for a professional SDK**.

### Key Takeaways:

1. **Critical Gaps:**
   - HTTP client error handling and retry logic
   - WebSocket streaming completely untested
   - No performance or load testing
   - No integration tests

2. **Immediate Priorities:**
   - Fix 2 failing tests
   - Implement HTTP mocking infrastructure
   - Increase unit test coverage to 80%+
   - Add performance benchmarking

3. **Success Criteria (3 months):**
   - 80%+ overall coverage
   - 150+ unit tests
   - 30+ integration tests
   - 20+ performance tests
   - All critical scenarios covered
   - Performance regression testing in CI/CD

4. **Investment Required:**
   - **Week 1:** Test infrastructure setup (40 hours)
   - **Weeks 2-3:** Unit test implementation (60 hours)
   - **Week 4:** Performance testing (30 hours)
   - **Weeks 5-6:** Integration tests (40 hours)
   - **Weeks 7-8:** Load testing & optimization (30 hours)
   - **Total:** ~200 hours of engineering effort

**Next Steps:** Begin with fixing failing tests and implementing HTTP mocking infrastructure, then systematically address coverage gaps according to the priority matrix.
