helper: combine helper ipc setup

The two-step args call is no longer necessary since stat is passed on initialisation.

Signed-off-by: Ophestra <cat@gensokyo.uk>

helper/cmd_test.go

@@ -0,0 +1,36 @@
+package helper_test
+
+import (
+	"context"
+	"errors"
+	"os"
+	"os/exec"
+	"testing"
+
+	"git.gensokyo.uk/security/fortify/helper"
+)
+
+func TestDirect(t *testing.T) {
+	t.Run("start non-existent helper path", func(t *testing.T) {
+		h := helper.NewDirect(context.Background(), "/nonexistent", argsWt, false, argF, nil)
+
+		if err := h.Start(); !errors.Is(err, os.ErrNotExist) {
+			t.Errorf("Start: error = %v, wantErr %v",
+				err, os.ErrNotExist)
+		}
+	})
+
+	t.Run("valid new helper nil check", func(t *testing.T) {
+		if got := helper.NewDirect(context.TODO(), "fortify", argsWt, false, argF, nil); got == nil {
+			t.Errorf("New(%q, %q) got nil",
+				argsWt, "fortify")
+			return
+		}
+	})
+
+	t.Run("implementation compliance", func(t *testing.T) {
+		testHelper(t, func(ctx context.Context, cmdF func(cmd *exec.Cmd), stat bool) helper.Helper {
+			return helper.NewDirect(ctx, "crash-test-dummy", argsWt, stat, argF, cmdF)
+		})
+	})
+}