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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| package testutil | ||
|
|
||
| import ( | ||
| "path/filepath" | ||
| "reflect" | ||
| "runtime" | ||
| "strconv" | ||
| "strings" | ||
|
|
||
| "github.com/google/go-cmp/cmp" | ||
| "github.com/google/go-cmp/cmp/cmpopts" | ||
| ) | ||
|
|
||
| // https://www.youtube.com/watch?v=Wncq9qtzgh0 | ||
|
|
||
| func Diff[T any](got, want T) string { | ||
| opts := cmp.Options{ | ||
| cmp.Exporter(func(p reflect.Type) bool { return true }), | ||
| cmpopts.EquateEmpty(), | ||
| } | ||
| diff := cmp.Diff(got, want, opts...) | ||
| if diff != "" { | ||
| return "\n-got +want\n" + diff | ||
| } | ||
| return "" | ||
| } | ||
|
|
||
| // Callers prints the stack trace of everything up till the line where Callers() | ||
| func Callers() string { | ||
| var pc [50]uintptr | ||
| n := runtime.Callers(2, pc[:]) // skip runtime.Callers + Callers | ||
| callsites := make([]string, 0, n) | ||
| frames := runtime.CallersFrames(pc[:n]) | ||
| for frame, more := frames.Next(); more; frame, more = frames.Next() { | ||
| callsites = append(callsites, frame.File+":"+strconv.Itoa(frame.Line)) | ||
| } | ||
| callsites = callsites[:len(callsites)-1] // skip testing.tRunner | ||
| if len(callsites) == 1 { | ||
| return "" | ||
| } | ||
| var b strings.Builder | ||
| for i := len(callsites) - 1; i >= 0; i-- { | ||
| if b.Len() > 0 { | ||
| b.WriteString(" -> ") | ||
| } | ||
| b.WriteString(filepath.Base(callsites[i])) | ||
| } | ||
| return "\n" + b.String() + ":" | ||
| } |