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Agent skill
go-testing-subtests
Subtest patterns with t.Run
Install this agent skill to your Project
npx add-skill https://github.com/JamesPrial/claudefiles/tree/main/skills/golang/testing/subtests
SKILL.md
Subtests with t.Run
Use t.Run to group related tests and enable selective execution.
CORRECT
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:
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
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
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