AgentSkillsCN

go-testing-subtests

使用t.Run的子测试模式

SKILL.md
--- frontmatter
name: go-testing-subtests
description: Subtest patterns with t.Run

Subtests with t.Run

Use t.Run to group related tests and enable selective execution.

CORRECT

go
func Test_User_Validation(t *testing.T) {
    t.Run("valid email", func(t *testing.T) {
        user := User{Email: "test@example.com"}
        if err := user.Validate(); err != nil {
            t.Errorf("expected valid, got error: %v", err)
        }
    })

    t.Run("invalid email", func(t *testing.T) {
        user := User{Email: "invalid"}
        if err := user.Validate(); err == nil {
            t.Error("expected error, got nil")
        }
    })

    t.Run("empty email", func(t *testing.T) {
        user := User{Email: ""}
        if err := user.Validate(); err == nil {
            t.Error("expected error, got nil")
        }
    })
}

Run specific subtest:

bash
go test -run Test_User_Validation/invalid_email

Why:

  • •Logical grouping of related tests
  • •Can run subtests individually
  • •Clean test output with hierarchy
  • •Failures don't stop other subtests

WRONG

go
func Test_User_ValidEmail(t *testing.T) { /* ... */ }
func Test_User_InvalidEmail(t *testing.T) { /* ... */ }
func Test_User_EmptyEmail(t *testing.T) { /* ... */ }

Problems:

  • •No grouping relationship
  • •Harder to run related tests together
  • •More verbose test names