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Testing Border Property Transformation Utilities in dcloudio/uni-app

This test suite validates the border property utility functions in uni-nvue-styler, focusing on the transformation and handling of CSS border values across different positions. The tests ensure proper parsing and application of border properties for width, style, and color across all four border positions.

Test Coverage Overview

The test coverage focuses on the fillBorderPosition utility function that handles CSS border property transformations. Key functionality includes:

Border property parsing for width, style, and color
Position-specific border property generation
Value transformation across all four border positions
Edge case handling for different border property combinations

Implementation Analysis

The testing approach utilizes TypeScript’s type system to ensure type safety in border property transformations. The implementation follows a functional pattern, processing arrays of IValue objects that represent CSS properties. The tests verify the correct expansion of shorthand border properties into their position-specific variants.

Technical Details

Testing tools and configuration include:

TypeScript for type-safe testing
Unit test framework for function validation
Custom IValue interface for property representation
Predefined position types array for border positions

Best Practices Demonstrated

The test suite demonstrates several quality testing practices:

Type-safe input and output validation
Modular function testing with clear input/output expectations
Consistent property transformation patterns
Structured array manipulation for predictable results

dcloudio/uni-app

packages/uni-nvue-styler/__tests__/test_utils.ts

            
export type IValue = {
  type: string
  prop: string
  value: string
  raws?: any
  source?: any
}

export const postionTypes = [
  'border-top',
  'border-right',
  'border-bottom',
  'border-left',
]
export const fillBorderPostion = (val: IValue[]): IValue[] => {
  const type = ['width', 'style', 'color']

  const res: IValue[] = []
  val.forEach((item) => {
    const currentProp = type.find((t) => item.prop.endsWith(t))!
    postionTypes.forEach((postion) => {
      res.push({
        ...item,
        type: item.type,
        prop: `${postion}-${currentProp}`,
        value: item.value,
      })
    })
  })
  return res
}