1 files changed, 81 insertions, 0 deletions
diff --git a/params/config_test.go b/params/config_test.go
new file mode 100644
index 000000000..487dc380c
--- /dev/null
+++ b/params/config_test.go
@@ -0,0 +1,81 @@
+// Copyright 2017 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package params
+
+import (
+	"math/big"
+	"reflect"
+	"testing"
+)
+
+func TestCheckCompatible(t *testing.T) {
+	type test struct {
+		stored, new *ChainConfig
+		head        uint64
+		wantErr     *ConfigCompatError
+	}
+	tests := []test{
+		{stored: AllProtocolChanges, new: AllProtocolChanges, head: 0, wantErr: nil},
+		{stored: AllProtocolChanges, new: AllProtocolChanges, head: 100, wantErr: nil},
+		{
+			stored:  &ChainConfig{EIP150Block: big.NewInt(10)},
+			new:     &ChainConfig{EIP150Block: big.NewInt(20)},
+			head:    9,
+			wantErr: nil,
+		},
+		{
+			stored: AllProtocolChanges,
+			new:    &ChainConfig{HomesteadBlock: nil},
+			head:   3,
+			wantErr: &ConfigCompatError{
+				What:         "Homestead fork block",
+				StoredConfig: big.NewInt(0),
+				NewConfig:    nil,
+				RewindTo:     0,
+			},
+		},
+		{
+			stored: AllProtocolChanges,
+			new:    &ChainConfig{HomesteadBlock: big.NewInt(1)},
+			head:   3,
+			wantErr: &ConfigCompatError{
+				What:         "Homestead fork block",
+				StoredConfig: big.NewInt(0),
+				NewConfig:    big.NewInt(1),
+				RewindTo:     0,
+			},
+		},
+		{
+			stored: &ChainConfig{HomesteadBlock: big.NewInt(30), EIP150Block: big.NewInt(10)},
+			new:    &ChainConfig{HomesteadBlock: big.NewInt(25), EIP150Block: big.NewInt(20)},
+			head:   25,
+			wantErr: &ConfigCompatError{
+				What:         "EIP150 fork block",
+				StoredConfig: big.NewInt(10),
+				NewConfig:    big.NewInt(20),
+				RewindTo:     9,
+			},
+		},
+	}
+
+	for _, test := range tests {
+		err := test.stored.CheckCompatible(test.new, test.head)
+		if !reflect.DeepEqual(err, test.wantErr) {
+			t.Errorf("error mismatch:\nstored: %v\nnew: %v\nhead: %v\nerr: %v\nwant: %v", test.stored, test.new, test.head, err, test.wantErr)
+		}
+	}
+}