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package errors
import (
"fmt"
"testing"
)
func TestJoin(t *testing.T) {
t.Run("nil", func(t *testing.T) {
err := Join(nil, nil, nil)
if err != nil {
t.Errorf("expected nil, got %v", err)
}
})
t.Run("one err", func(t *testing.T) {
expected := fmt.Errorf("fake")
err := Join(nil, expected, nil)
je := err.(*joinError)
un := je.Unwrap()
if len(un) != 1 {
t.Fatalf("expected 1 err, got %d", len(un))
}
if s := un[0].Error(); s != expected.Error() {
t.Errorf("expected %v, got %v", expected, un[0])
}
if s := err.Error(); s != expected.Error() {
t.Errorf("expected %s, got %s", expected, err)
}
})
t.Run("many errs", func(t *testing.T) {
expected1 := fmt.Errorf("fake 1")
expected2 := fmt.Errorf("fake 2")
err := Join(nil, expected1, nil, nil, expected2, nil)
je := err.(*joinError)
un := je.Unwrap()
if len(un) != 2 {
t.Fatalf("expected 2 err, got %d", len(un))
}
if s := un[0].Error(); s != expected1.Error() {
t.Errorf("expected %v, got %v", expected1, un[0])
}
if s := un[1].Error(); s != expected2.Error() {
t.Errorf("expected %v, got %v", expected2, un[1])
}
expectedS := expected1.Error() + "\n" + expected2.Error()
if s := err.Error(); s != expectedS {
t.Errorf("expected %s, got %s", expectedS, err)
}
})
}
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