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package errorhandling
import (
"errors"
"fmt"
"testing"
"github.com/stretchr/testify/assert"
)
func TestCause(t *testing.T) {
t.Parallel()
for _, tc := range []struct {
name string
err func() error
expectedErr error
}{
{
name: "nil error",
err: func() error { return nil },
expectedErr: nil,
},
{
name: "equal errors",
err: func() error { return errors.New("foo") },
expectedErr: errors.New("foo"),
},
{
name: "wrapped error",
err: func() error { return fmt.Errorf("baz: %w", fmt.Errorf("bar: %w", errors.New("foo"))) },
expectedErr: errors.New("foo"),
},
{
name: "max depth reached",
err: func() error {
err := errors.New("error")
for i := 0; i <= 101; i++ {
err = fmt.Errorf("%d: %w", i, err)
}
return err
},
expectedErr: fmt.Errorf("0: %w", errors.New("error")),
},
} {
tc := tc
t.Run(tc.name, func(t *testing.T) {
t.Parallel()
err := Cause(tc.err())
assert.Equal(t, tc.expectedErr, err)
})
}
}
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