Function formatTitle

packages/runner/src/suite.ts:997–1057

(template: string, items: any[], idx: number)

}

function formatTitle(template: string, items: any[], idx: number) {
  if (template.includes('%#') || template.includes('%$')) {
    // '%#' match index of the test case
    template = template
      .replace(/%%/g, '__vitest_escaped_%__')
      .replace(/%#/g, `${idx}`)
      .replace(/%\$/g, `${idx + 1}`)
      .replace(/__vitest_escaped_%__/g, '%%')
  }
  const count = template.split('%').length - 1

  if (template.includes('%f')) {
    const placeholders = template.match(/%f/g) || []
    placeholders.forEach((_, i) => {
      if (isNegativeNaN(items[i]) || Object.is(items[i], -0)) {
        // Replace the i-th occurrence of '%f' with '-%f'
        let occurrence = 0
        template = template.replace(/%f/g, (match) => {
          occurrence++
          return occurrence === i + 1 ? '-%f' : match
        })
      }
    })
  }

  const isObjectItem = isObject(items[0])
  function formatAttribute(s: string) {
    return s.replace(/\$([$\w.]+)/g, (_, key: string) => {
      const isArrayKey = /^\d+$/.test(key)
      if (!isObjectItem && !isArrayKey) {
        return `$${key}`
      }
      const arrayElement = isArrayKey ? objectAttr(items, key) : undefined
      const value = isObjectItem ? objectAttr(items[0], key, arrayElement) : arrayElement
      return objDisplay(value, {
        truncate: runner?.config?.chaiConfig?.truncateThreshold,
      })
    })
  }

  let output = ''
  let i = 0
  handleRegexMatch(
    template,
    formatRegExp,
    // format "%"
    (match) => {
      if (i < count) {
        output += format(match[0], items[i++])
      }
      else {
        output += match[0]
      }
    },
    // format "$"
    (nonMatch) => {
      output += formatAttribute(nonMatch)
    },