Add config loading and dry-run validation

internal/cli/root_test.go

@@ -3,6 +3,8 @@ package cli
 import (
 	"bytes"
 	"context"
+	"os"
+	"path/filepath"
 	"strings"
 	"testing"
 )
@@ -61,6 +63,38 @@ func TestPlaceholderCommandsFailClearly(t *testing.T) {
 	}
 }
 
+func TestExecuteRunDryRun(t *testing.T) {
+	configPath := filepath.Join(t.TempDir(), "config.yml")
+	err := os.WriteFile(configPath, []byte(`
+pipelines:
+  - id: reports
+    source:
+      backend: local
+      path: /source
+    destinations:
+      - id: archive
+        backend: local
+        path: /archive
+`), 0o600)
+	if err != nil {
+		t.Fatalf("write config: %v", err)
+	}
+
+	var stdout, stderr bytes.Buffer
+
+	code := Execute(context.Background(), []string{"run", "--config", configPath, "--dry-run"}, &stdout, &stderr)
+
+	if code != exitOK {
+		t.Fatalf("exit code = %d, want %d; stderr = %q", code, exitOK, stderr.String())
+	}
+	if !strings.Contains(stdout.String(), "Configured pipelines: 1") {
+		t.Fatalf("stdout = %q, want config summary", stdout.String())
+	}
+	if stderr.Len() != 0 {
+		t.Fatalf("stderr = %q, want empty", stderr.String())
+	}
+}
+
 func TestUnknownCommandIsUsageError(t *testing.T) {
 	var stdout, stderr bytes.Buffer