pkg/aflow/action/crash: add simple testing action

Author: dvyukov

pkg/aflow/action/crash/test.go

@@ -0,0 +1,40 @@
+// Copyright 2026 syzkaller project authors. All rights reserved.
+// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
+
+package crash
+
+import (
+	"encoding/json"
+
+	"github.com/google/syzkaller/pkg/aflow"
+)
+
+// TestPatch action does an in-tree kernel build in KernelScratchSrc dir,
+// and runs the reproducer on the newly built kernel.
+// If there are build/boot/test errors, a detailed error message is returned in TestError.
+// The action also collects diff of the local changes, returns it in PatchDiff,
+// and resets source code state to HEAD (removes all local edits).
+var TestPatch = aflow.NewFuncAction("test-patch", testPatch)
+
+type testArgs struct {
+	Syzkaller        string
+	Image            string
+	Type             string
+	VM               json.RawMessage
+	ReproOpts        string
+	ReproSyz         string
+	ReproC           string
+	SyzkallerCommit  string
+	KernelScratchSrc string
+	KernelCommit     string
+	KernelConfig     string
+}
+
+type testResult struct {
+	PatchDiff string
+	TestError string
+}
+
+func testPatch(ctx *aflow.Context, args testArgs) (testResult, error) {
+	return testResult{}, nil
+}