From d9750f200dc6f221ef44d43507b616f664954d2f Mon Sep 17 00:00:00 2001
From: Lunny Xiao <xiaolunwen@gmail.com>
Date: Sat, 25 Mar 2017 23:21:18 +0800
Subject: [PATCH] add sum tests

---
 session_sum_test.go | 71 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 session_sum_test.go

diff --git a/session_sum_test.go b/session_sum_test.go
new file mode 100644
index 00000000..8829bcc6
--- /dev/null
+++ b/session_sum_test.go
@@ -0,0 +1,71 @@
+// Copyright 2017 The Xorm Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package xorm
+
+import (
+	"fmt"
+	"strconv"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func isFloatEq(i, j float64, precision int) bool {
+	return fmt.Sprintf("%."+strconv.Itoa(precision)+"f", i) == fmt.Sprintf("%."+strconv.Itoa(precision)+"f", j)
+}
+
+func TestSum(t *testing.T) {
+	type SumStruct struct {
+		Int   int
+		Float float32
+	}
+
+	var (
+		cases = []SumStruct{
+			{1, 6.2},
+			{2, 5.3},
+			{92, -0.2},
+		}
+	)
+
+	var i int
+	var f float32
+	for _, v := range cases {
+		i += v.Int
+		f += v.Float
+	}
+
+	assert.NoError(t, testEngine.Sync2(new(SumStruct)))
+
+	cnt, err := testEngine.Insert(cases)
+	assert.NoError(t, err)
+	assert.EqualValues(t, 3, cnt)
+
+	colInt := testEngine.ColumnMapper.Obj2Table("Int")
+	colFloat := testEngine.ColumnMapper.Obj2Table("Float")
+
+	sumInt, err := testEngine.Sum(new(SumStruct), "`"+colInt+"`")
+	assert.NoError(t, err)
+	assert.EqualValues(t, int(sumInt), i)
+
+	sumFloat, err := testEngine.Sum(new(SumStruct), "`"+colFloat+"`")
+	assert.NoError(t, err)
+	assert.Condition(t, func() bool {
+		return isFloatEq(sumFloat, float64(f), 2)
+	})
+
+	sums, err := testEngine.Sums(new(SumStruct), "`"+colInt+"`", "`"+colFloat+"`")
+	assert.NoError(t, err)
+	assert.EqualValues(t, 2, len(sums))
+	assert.EqualValues(t, i, int(sums[0]))
+	assert.Condition(t, func() bool {
+		return isFloatEq(sums[1], float64(f), 2)
+	})
+
+	sumsInt, err := testEngine.SumsInt(new(SumStruct), "`"+colInt+"`")
+	assert.NoError(t, err)
+	assert.EqualValues(t, 1, len(sumsInt))
+	assert.EqualValues(t, i, int(sumsInt[0]))
+}