rewrite checkpoint

vendor/github.com/kballard/go-shellquote/both_test.go

@@ -0,0 +1,29 @@
+package shellquote
+
+import (
+	"reflect"
+	"testing"
+	"testing/quick"
+)
+
+// this is called bothtest because it tests Split and Join together
+
+func TestJoinSplit(t *testing.T) {
+	f := func(strs []string) bool {
+		// Join, then split, the input
+		combined := Join(strs...)
+		split, err := Split(combined)
+		if err != nil {
+			t.Logf("Error splitting %#v: %v", combined, err)
+			return false
+		}
+		if !reflect.DeepEqual(strs, split) {
+			t.Logf("Input %q did not match output %q", strs, split)
+			return false
+		}
+		return true
+	}
+	if err := quick.Check(f, nil); err != nil {
+		t.Error(err)
+	}
+}