feat: Introduce %$ option to add number of the test to its title

docs/api/index.md

@@ -311,6 +311,7 @@ You can inject parameters with [printf formatting](https://nodejs.org/api/util.h
 - `%j`: json
 - `%o`: object
 - `%#`: index of the test case
+- `%$`: number of the test case
 - `%%`: single percent sign ('%')
 
 ```ts

packages/runner/src/suite.ts

@@ -788,11 +788,12 @@ function formatName(name: string | Function) {
 }
 
 function formatTitle(template: string, items: any[], idx: number) {
-  if (template.includes('%#')) {
+  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

test/core/test/each.test.ts

@@ -98,6 +98,28 @@ test.each([
   expect(result).toBe(expected)
 })
 
+test.each([
+  [1, 1, 2],
+  [1, 2, 3],
+  [2, 1, 3],
+])('the number of the test case is %$', (a, b, expected) => {
+  expect(a + b).toBe(expected)
+})
+
+test.each([
+  [1, 2, 3],
+  [4, 5, 9],
+])('return a promise like result %$', async (a, b, expected) => {
+  const promiseResolver = (first: number, second: number) => {
+    return new Promise((resolve) => {
+      setTimeout(() => resolve(first + second), 1)
+    })
+  }
+
+  const result = await promiseResolver(a, b)
+  expect(result).toBe(expected)
+})
+
 describe('context on test and describe - todo/skip', () => {
   let count = 0