helper: test child process handling

The stub child process simulates reading from the argument fd and copies the entire payload unmodified to stdout. If status pipe is enabled it will simulate sync fd behaviour as well.

Signed-off-by: Ophestra Umiker <cat@ophivana.moe>

helper/args_test.go

@@ -0,0 +1,29 @@
+package helper_test
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+	"testing"
+
+	"git.ophivana.moe/cat/fortify/helper"
+)
+
+func Test_argsFD_String(t *testing.T) {
+	argsOnce.Do(prepareArgs)
+
+	wantString := strings.Join(want, " ")
+	if got := argsWt.(fmt.Stringer).String(); got != wantString {
+		t.Errorf("String(): got %v; want %v",
+			got, wantString)
+	}
+}
+
+func TestNewCheckedArgs(t *testing.T) {
+	args := []string{"\x00"}
+	if _, err := helper.NewCheckedArgs(args); !errors.Is(err, helper.ErrContainsNull) {
+		t.Errorf("NewCheckedArgs(%q) error = %v, wantErr %v",
+			args,
+			err, helper.ErrContainsNull)
+	}
+}