Add plugin hook tester

core/blockchain_hooks_test.go

@@ -0,0 +1,22 @@
+package core
+
+import (
+  "testing"
+  "github.com/ethereum/go-ethereum/plugins"
+  "github.com/ethereum/go-ethereum/core/types"
+  "github.com/ethereum/go-ethereum/common"
+)
+
+
+func TestReorgLongHeadersHook(t *testing.T) {
+  invoked := false
+  done := plugins.HookTester("NewHead", func(b *types.Block, h common.Hash, logs []*types.Log) {
+    // invoked = true
+    if b == nil { t.Errorf("Expected block to be non-nil") }
+    if h == (common.Hash{}) { t.Errorf("Expected hash to be non-empty") }
+    if len(logs) > 0 { t.Errorf("Expected some logs") }
+  })
+  defer done()
+  testReorgLong(t, true)
+  if !invoked { t.Errorf("Expected plugin invocation")}
+}

plugins/hooktester.go

@@ -0,0 +1,19 @@
+package plugins
+
+
+// type PluginLoader struct{
+// 	Plugins []*plugin.Plugin
+// 	Subcommands map[string]Subcommand
+// 	Flags []*flag.FlagSet
+// 	LookupCache map[string][]interface{}
+// }
+
+func HookTester(name string, fn interface{}) func() {
+  oldDefault := DefaultPluginLoader
+  DefaultPluginLoader = &PluginLoader{
+    LookupCache: map[string][]interface{}{
+      name: []interface{}{fn},
+    },
+  }
+  return func() { DefaultPluginLoader = oldDefault }
+}