feat(runner): describe/test name support anonymous function (#3562)

Author: btea

packages/runner/src/suite.ts

@@ -269,7 +269,7 @@ function createTest(fn: (
 }
 
 function formatName(name: string | Function) {
-  return typeof name === 'string' ? name : name instanceof Function ? name.name : String(name)
+  return typeof name === 'string' ? name : name instanceof Function ? (name.name || '<anonymous>') : String(name)
 }
 
 function formatTitle(template: string, items: any[], idx: number) {

test/reporters/fixtures/function-as-name.test.ts

@@ -15,6 +15,18 @@ describe(Bar, () => {
   })
 })
 
+describe(() => {}, () => {
+  test(foo, () => {
+    expect(0).toBe(0)
+  })
+})
+
+describe(foo, () => {
+  test(() => {}, () => {
+    expect(0).toBe(0)
+  })
+})
+
 describe.each([1])(foo, () => {
   test.each([1])(foo, () => {
     expect(0).toBe(0)

test/reporters/tests/function-as-name.test.ts

@@ -9,6 +9,8 @@ test('should print function name', async () => {
   expect(stdout).toBeTruthy()
   expect(stdout).toContain('function-as-name.test.ts > foo > Bar')
   expect(stdout).toContain('function-as-name.test.ts > Bar > foo')
+  expect(stdout).toContain('function-as-name.test.ts > <anonymous> > foo')
+  expect(stdout).toContain('function-as-name.test.ts > foo > <anonymous>')
   expect(stdout).toContain('function-as-name.test.ts > foo > foo')
   expect(stdout).toContain('function-as-name.test.ts > Bar > Bar')
 })