leptos-shadcn-ui/docs/remediation/TEST_COVERAGE_REMEDIATION_PLAN.md

# 🧪 Test Coverage Remediation Plan
**Priority 1: Critical Test Coverage Issues**

## 📊 Current Test Coverage Status

### **Test Coverage Crisis**
- **653 Rust files** in repository
- **~30% overall test coverage** (estimated)
- **Many stub implementations** with "will fail initially" comments
- **Missing integration tests** for component interactions
- **No accessibility testing** framework
- **Limited performance testing**

### **Components by Test Status**

| Component | Test Files | Status | Coverage | Priority |
|-----------|------------|--------|----------|----------|
| Button | 4 files | ✅ Working | ~80% | Low |
| Input | 8 files | ⚠️ Stub tests | ~30% | **HIGH** |
| Card | 3 files | ⚠️ Partial | ~50% | Medium |
| Dialog | 2 files | ❌ Missing | ~20% | **HIGH** |
| Form | 1 file | ❌ Stub | ~10% | **HIGH** |
| Table | 1 file | ❌ Missing | ~15% | **HIGH** |
| Select | 2 files | ⚠️ Partial | ~40% | Medium |
| Textarea | 3 files | ⚠️ Stub | ~25% | **HIGH** |
| Switch | 2 files | ⚠️ Partial | ~35% | Medium |
| RadioGroup | 3 files | ⚠️ Stub | ~30% | **HIGH** |

---

## 🎯 Remediation Strategy

### **Phase 1: Critical Component Tests (Week 1)**

#### **Input Component - Priority 1**
**Current Issues:**
- 8 test files with stub implementations
- Tests marked as "will fail initially"
- Missing validation testing
- No accessibility tests

**Remediation Plan:**
```rust
// Current stub test
#[test]
fn test_input_basic_rendering() {
    // This test will fail initially - we need to implement proper rendering
}

// Target implementation
#[test]
fn test_input_basic_rendering() {
    let input = Input::new(InputProps {
        placeholder: "Enter text".to_string(),
        value: "".to_string(),
        ..Default::default()
    });
    
    let rendered = input.render();
    assert!(rendered.contains("input"));
    assert!(rendered.contains("Enter text"));
}
```

**Files to Fix:**
- `packages/leptos/input/src/tdd_tests/basic_rendering_tests.rs` (224 lines → split)
- `packages/leptos/input/src/tdd_tests/validation_tests.rs` (180+ lines → split)
- `packages/leptos/input/src/tdd_tests/accessibility_tests.rs` (stub)
- `packages/leptos/input/src/tdd_tests/performance_tests.rs` (stub)

#### **Dialog Component - Priority 1**
**Current Issues:**
- Only 2 test files
- Missing modal behavior tests
- No accessibility testing
- No keyboard navigation tests

**Remediation Plan:**
- Create comprehensive test suite
- Add accessibility tests
- Test modal behavior
- Test keyboard navigation

#### **Form Component - Priority 1**
**Current Issues:**
- Only 1 stub test file
- No validation testing
- No integration tests

**Remediation Plan:**
- Implement form validation tests
- Add field interaction tests
- Create integration tests

### **Phase 2: Test Infrastructure (Week 2)**

#### **Test File Refactoring**
**Current Issues:**
- Files exceeding 300-line limit
- Monolithic test files
- Poor test organization

**Remediation Plan:**
```
packages/leptos/input/src/tests/
├── basic_rendering.rs (max 100 lines)
├── validation.rs (max 100 lines)
├── accessibility.rs (max 100 lines)
├── performance.rs (max 100 lines)
├── integration.rs (max 100 lines)
└── mod.rs (test module organization)
```

#### **Test Categories Implementation**

1. **Basic Rendering Tests**
   - Component renders without errors
   - Props are applied correctly
   - Default values work

2. **Validation Tests**
   - Input validation works
   - Error states display correctly
   - Validation messages show

3. **Accessibility Tests**
   - ARIA attributes present
   - Keyboard navigation works
   - Screen reader compatibility
   - Focus management

4. **Performance Tests**
   - Render time benchmarks
   - Memory usage tests
   - Bundle size validation

5. **Integration Tests**
   - Component interactions
   - Form workflows
   - State management

### **Phase 3: Advanced Testing (Week 3-4)**

#### **Property-Based Testing**
```rust
use proptest::prelude::*;

proptest! {
    #[test]
    fn input_handles_any_valid_props(
        placeholder in any::<String>(),
        value in any::<String>(),
        disabled in any::<bool>()
    ) {
        let props = InputProps {
            placeholder,
            value,
            disabled,
            ..Default::default()
        };
        
        let input = Input::new(props);
        let rendered = input.render();
        assert!(rendered.contains("input"));
    }
}
```

#### **Snapshot Testing**
```rust
#[test]
fn input_snapshot_test() {
    let input = Input::new(InputProps {
        placeholder: "Enter text".to_string(),
        value: "test".to_string(),
        ..Default::default()
    });
    
    let rendered = input.render();
    insta::assert_snapshot!(rendered);
}
```

#### **Visual Regression Testing**
```rust
#[test]
fn input_visual_regression() {
    let input = Input::new(InputProps::default());
    let screenshot = capture_component_screenshot(input);
    assert_visual_match(screenshot, "input_default.png");
}
```

---

## 🛠️ Implementation Plan

### **Week 1: Critical Components**
- [ ] Fix Input component tests (8 files)
- [ ] Implement Dialog component tests
- [ ] Create Form component tests
- [ ] Add Table component tests

### **Week 2: Test Infrastructure**
- [ ] Refactor large test files
- [ ] Create test module structure
- [ ] Implement test utilities
- [ ] Add test documentation

### **Week 3: Advanced Testing**
- [ ] Property-based testing
- [ ] Snapshot testing
- [ ] Visual regression testing
- [ ] Performance benchmarking

### **Week 4: Integration & Coverage**
- [ ] Integration tests
- [ ] End-to-end tests
- [ ] Coverage reporting
- [ ] Test documentation

---

## 📈 Success Metrics

### **Coverage Targets**
- **Week 1**: 60% overall coverage
- **Week 2**: 75% overall coverage
- **Week 3**: 85% overall coverage
- **Week 4**: 90% overall coverage

### **Quality Metrics**
- **Zero stub tests** remaining
- **All components** have comprehensive test suites
- **Accessibility tests** for all interactive components
- **Performance benchmarks** established

### **File Organization**
- **All test files** under 100 lines
- **Logical test grouping** by functionality
- **Consistent test patterns** across components

---

## 🔧 Tools & Dependencies

### **Testing Framework**
```toml
[dev-dependencies]
proptest = "1.4"
insta = "1.39"
criterion = "0.5"
wasm-bindgen-test = "0.3"
```

### **Test Utilities**
- Custom test helpers for Leptos components
- Screenshot capture utilities
- Performance measurement tools
- Accessibility testing helpers

---

## 📋 Component-Specific Plans

### **Input Component**
- **Files**: 8 test files to fix
- **Priority**: HIGH
- **Timeline**: Week 1
- **Focus**: Validation, accessibility, performance

### **Dialog Component**
- **Files**: 2 test files to expand
- **Priority**: HIGH
- **Timeline**: Week 1
- **Focus**: Modal behavior, accessibility, keyboard navigation

### **Form Component**
- **Files**: 1 stub file to implement
- **Priority**: HIGH
- **Timeline**: Week 1
- **Focus**: Validation, field interactions, integration

### **Table Component**
- **Files**: 1 missing file to create
- **Priority**: HIGH
- **Timeline**: Week 1
- **Focus**: Data rendering, sorting, filtering

---

## 🚀 Next Steps

1. **Start with Input component** (highest impact)
2. **Create test file templates** for consistency
3. **Implement test utilities** for common patterns
4. **Set up coverage reporting** for tracking progress
5. **Document test patterns** for team consistency

This remediation plan will transform the test coverage from ~30% to 90%+ within 4 weeks, establishing a solid foundation for reliable component development.

---

*Plan created: September 20, 2025*  
*Target completion: October 18, 2025*