vitest-browser

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Generate Vitest Browser Mode tests with intelligent component classification (Simple/Complex)

Design

What this skill does


# Vitest Browser Mode Test Generation

Generate comprehensive browser-based component tests using Vitest Browser Mode with intelligent component classification.

## Workflow

1. **Detect Project Configuration**
   - Check for `vitest.config.ts` or `vitest.config.js`
   - Verify browser mode dependencies:
     - `@vitest/browser*` (e.g., `-playwright`, `-webdriverio`)
     - `vitest-browser-react` (for React render)
   - **Check tsconfig for Vitest globals** (determines import strategy)
   - Identify testing utilities available

2. **Analyze Component Structure**
   - Read component source file(s)
   - Identify props, state management, sub-components
   - Detect patterns (compound components, controlled state, etc.)

3. **Classify Component**
   - Apply scoring heuristics (see Classification below)
   - Determine: **Simple** or **Complex**

4. **Generate Test File**
   - Apply appropriate test suite template
   - Use Testing Library style queries
   - Include edge cases and accessibility checks

5. **Validate Coverage**
   - Ensure all props are tested
   - Verify interaction patterns covered
   - Check edge cases addressed

## Component Classification

### Scoring Heuristics

**Simple Indicators (+1 each):**
| Indicator | Description |
|-----------|-------------|
| Single file | Component in one file, no separate sub-components |
| Visual props only | Props control appearance (variant, size, color) |
| No sub-components | No compound component pattern |
| forwardRef only | Simple ref forwarding, no complex hooks |
| < 150 LOC | Less than 150 lines of code |

**Complex Indicators (+2 each):**
| Indicator | Description |
|-----------|-------------|
| Object.assign pattern | `Object.assign(Component, { Sub1, Sub2 })` |
| useControllableState | Controlled/uncontrolled state management |
| Provider/Context | Uses `*Provider` or `use*Context` |
| value + onChange pair | Controlled component pattern |
| File/Date/Validation | File handling, date logic, or validation |

### Classification Rule

```
IF simpleScore >= 3 AND complexScore < 3:
  → Simple Component
ELSE:
  → Complex Component
```

### Detection Patterns

**Simple Component Examples:**
- Tag, Badge, Button (visual only)
- Typography, Icon, Avatar
- Spinner, Skeleton, Divider

**Complex Component Examples:**
- DatePicker, TimePicker
- FileUpload, Dropzone
- Select, Combobox, Autocomplete
- Dialog, Modal, Drawer
- Tabs, Accordion

**Code Pattern Detection:**

```tsx
// → Complex: Object.assign compound pattern
Object.assign(Select, {
  Trigger: SelectTrigger,
  Content: SelectContent,
  Item: SelectItem,
});

// → Complex: Controllable state
import { useControllableState } from './hooks';

// → Complex: Context pattern
const SelectContext = createContext<SelectContextValue | null>(null);
export function SelectProvider({ children }) { ... }

// → Complex: Controlled component
interface Props {
  value?: string;
  onValueChange?: (value: string) => void;
}
```

## Vitest Globals Detection

Check if Vitest globals are configured in tsconfig to determine import strategy.

**Detection Logic:**

1. Read `tsconfig.json` (or `tsconfig.app.json`, `tsconfig.test.json`)
2. Check `compilerOptions.types` array for `"vitest/globals"`

**tsconfig with globals (no vitest import needed):**

```json
{
  "compilerOptions": {
    "types": ["vitest/globals"]
  }
}
```

**Import Strategy:**

| Globals Configured | Import Statement |
|--------------------|------------------|
| Yes (`vitest/globals` in types) | No `vitest` import needed |
| No | `import { expect, describe, it, vi, beforeEach } from 'vitest'` |

**Always Required Imports (regardless of globals):**

```tsx
import { page, userEvent } from 'vitest/browser'
import { render } from 'vitest-browser-react'
```

## Flags

- `--simple`: Force Simple component test generation
- `--complex`: Force Complex component test generation

## References

@references/vitest-browser-api.md
@references/test-patterns.md

## Usage Examples

```
# Auto-detect and generate tests
/stylish-vitest-browser src/components/Button.tsx

# Force simple component tests
/stylish-vitest-browser src/components/Tag.tsx --simple

# Force complex component tests
/stylish-vitest-browser src/components/DatePicker/index.tsx --complex
```

## Test File Location

Generated test files follow the pattern:
- Source: `src/components/Button.tsx`
- Test: `src/components/Button.test.tsx`

Or for complex components with directory structure:
- Source: `src/components/Select/index.tsx`
- Test: `src/components/Select/Select.test.tsx`

Files: 3

Size: 32.3 KB

Complexity: 48/100

Category: Design

Source: https://github.com/stylelist94/claude-plugins/tree/main/plugins/stylish-frontend/skills/vitest-browser

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