add logger and test packages

Signed-off-by: Meredith Lancaster <malancas@github.com>

pkg/cmd/attestation/logger/logger.go

@@ -0,0 +1,22 @@
+package logger
+
+import (
+	"fmt"
+
+	"github.com/cli/cli/v2/pkg/iostreams"
+)
+
+type Logger struct {
+	IO      *iostreams.IOStreams
+	Quiet   bool
+	Verbose bool
+}
+
+func (l *Logger) VerbosePrint(msg string) (int, error) {
+	if !l.verbose || !opts.IO.IsStdoutTTY() {
+		return 0, nil
+	}
+
+	return fmt.Fprintf(l.IO.ErrOut, msg)
+}
+

pkg/cmd/attestation/test/path.go

@@ -0,0 +1,13 @@
+package test
+
+import (
+	"path/filepath"
+	"runtime"
+)
+
+func NormalizeRelativePath(posixPath string) string {
+	if runtime.GOOS == "windows" {
+		return filepath.FromSlash(posixPath)
+	}
+	return posixPath
+}