go/error_example_test.go
Snider 5be20af4b0 feat: eliminate fmt, string concat — add core.Println, use Concat/Path everywhere
New primitive: core.Println() wraps fmt.Println.

Replaced across all test + example files:
- fmt.Println → Println (17 example files)
- fmt.Sprintf → Concat + Sprint
- dir + "/file" → Path(dir, "file") (path security)
- "str" + var → Concat("str", var) (AX consistency)

"fmt" import is now zero across all test files.
String concat with + is zero across all test files.

Remaining 9 stdlib imports (all Go infrastructure):
testing, context, time, sync, embed, io/fs, bytes, gzip, base64

558 tests, 84.5% coverage.

Co-Authored-By: Virgil <virgil@lethean.io>
2026-03-25 19:42:39 +00:00

33 lines
629 B
Go

package core_test
import (
. "dappco.re/go/core"
)
func ExampleE() {
err := E("cache.Get", "key not found", nil)
Println(Operation(err))
Println(ErrorMessage(err))
// Output:
// cache.Get
// key not found
}
func ExampleWrap() {
cause := NewError("connection refused")
err := Wrap(cause, "database.Connect", "failed to reach host")
Println(Operation(err))
Println(Is(err, cause))
// Output:
// database.Connect
// true
}
func ExampleRoot() {
cause := NewError("original")
wrapped := Wrap(cause, "op1", "first wrap")
double := Wrap(wrapped, "op2", "second wrap")
Println(Root(double))
// Output: original
}