From 78e2a89d9e0417b3c1f0de575e9c20a4ceec08f2 Mon Sep 17 00:00:00 2001
From: Roc Yu <rociiu.yu@gmail.com>
Date: Wed, 18 Jul 2018 21:06:53 +0800
Subject: [PATCH] core: add unit tests to GasPool

---
 core/gaspool_test.go | 75 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 core/gaspool_test.go

diff --git a/core/gaspool_test.go b/core/gaspool_test.go
new file mode 100644
index 0000000000..1fe4a2bfea
--- /dev/null
+++ b/core/gaspool_test.go
@@ -0,0 +1,75 @@
+// 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 core
+
+import (
+	"math"
+	"testing"
+)
+
+func TestGasPoolAdd(t *testing.T) {
+	var gasPool GasPool
+
+	gasPool = math.MaxUint64 - 1
+	func() {
+		defer func() {
+			if r := recover(); r == nil {
+				t.Error("expected error, got nil")
+			}
+		}()
+		gasPool.AddGas(2)
+	}()
+
+	gasPool = 1
+	gasPool = *gasPool.AddGas(1)
+	if gasPool != 2 {
+		t.Errorf("expected %v, got %v", 2, gasPool)
+	}
+}
+
+func TestGasPoolSub(t *testing.T) {
+	var gasPool GasPool
+
+	gasPool = 10
+	err := gasPool.SubGas(11)
+	if err != ErrGasLimitReached {
+		t.Errorf("expected err: %v, got %v", ErrGasLimitReached, err)
+	}
+
+	gasPool = 10
+	err = gasPool.SubGas(1)
+	if err != nil {
+		t.Errorf("expected nil, got %v", err)
+	}
+	if gasPool != 9 {
+		t.Errorf("expected %v, got %v", 9, gasPool)
+	}
+}
+
+func TestGasPoolGas(t *testing.T) {
+	var gasPool GasPool = 100
+	if gasPool.Gas() != 100 {
+		t.Errorf("expected %v, got %v", 100, gasPool.Gas())
+	}
+}
+
+func TestGasPoolString(t *testing.T) {
+	var gasPool GasPool = 123
+	if gasPool.String() != "123" {
+		t.Errorf("expected %v, got %v", "123", gasPool.String())
+	}
+}