我在测试运行时出现以下恐慌：
panic: sql: connection returned that was never out
测试内容
实际测试是测试套件的一部分，定义如下：
func (suite *RowsSuite) TestReadFrom_SanityTest() {
t := suite.T()
rows := new(sql.Rows)
*rows = suite.nonEmptyRows
assert.True(t, rows.Next())
// hit the function like it's supposed to be hit
err := ReadFrom(rows,
suite.fnStubFalse,
suite.spots[0],
suite.spots[1],
suite.spots[2])
// There better be no error
if !assert.Nil(t, err) {
t.Error(err.ToString(false))
}
}
被测代码
我负责测试这个函数：
// ReadFrom reads values from `rows` into `valuePlaceholders`
func ReadFrom(rows *sql.Rows,
readerFunc func(rowIndex int, readValues ...interface{}) (bool, *errors.ErrorSt),
valuePlaceholders ...interface{}) (err *errors.ErrorSt) {
rowLine := 1
for rows.Next() {
if err := rows.Scan(valuePlaceholders...); err != nil {
return errors.Database().AddDetails(err.Error(), valuePlaceholders)
}
if readerFunc != nil {
skipRest, err := readerFunc(rowLine, valuePlaceholders...)
if err != nil {
return err
}
if skipRest {
break
}
}
rowLine++
}
if rowLine == 1 {
return errors.Get(appErrors.ACNoRows)
}
return nil
}
设置
suite.fnStubFalse只是一个返回false,nil的函数存根suite.spots只是 3 号的[]*interface{}。简单地说，这是三个需要Scan的地方。
与测试相关的其余定义在此帮助程序方法中定义，该方法在套件设置时调用：
func (suite *RowsSuite) setupRowStates() {
// for throwing fatal error right away
t := suite.T()
// fire up the mock
suite.db, suite.mock, suite.err = sqlmock.New()
// if there's an error, fatally throw it right away!
if !assert.Nilf(t,
suite.err,
"Error with initializing a stub database connection") {
t.Fatal()
}
// define the possible expectant result sets
noRows := sqlmock.NewRows(suite.columns)
nonEmptyRows := sqlmock.NewRows(suite.columns).
AddRow(381, "Beans", 1.59).
AddRow(34981, "Frozen Pizza", 5.49)
// define our sql behavior
regex := "^SELECT (.+) FROM items$"
sql := "SELECT (item_id, item_name, item_price) FROM items"
specificRegex := "^SELECT (.+) FROM items (.+)$"
specificSQL := `
SELECT (item_id, item_name, item_price) FROM items i
INNER JOIN stock s
ON s.item_id = i.item_id
WHERE TIME_TO_SEC(s.stock_time) > TIME_TO_SEC(NOW())`
// setup general query to return non-empty rows
suite.mock.ExpectQuery(regex).
WillReturnRows(nonEmptyRows)
// setup specific query to return empty rows
suite.mock.ExpectQuery(specificRegex).
WillReturnRows(noRows)
// hit both queries right now and store the state of their
// return values, terminating right away on any errors
var err error
rows, err := suite.db.Query(sql)
if err != nil {
t.Fatal(err.Error())
}
suite.nonEmptyRows = *rows
emptyRows, err := suite.db.Query(specificSQL)
if err != nil {
t.Fatal(err.Error())
}
suite.noRows = *emptyRows
}
完整错误
这个怪物：
Running tool: C:Gobingo.exe test -timeout 30s ezsoftapiserver_sdkdb -run ^TestRowsSuite$
panic: sql: connection returned that was never out
goroutine 22 [running]:
database/sql.(*DB).putConn(0xc04204d400, 0xc04212a080, 0x0, 0x0, 0xc04213de01)
C:/Go/src/database/sql/sql.go:1158 +0x351
database/sql.(*driverConn).releaseConn(0xc04212a080, 0x0, 0x0)
C:/Go/src/database/sql/sql.go:383 +0x53
database/sql.(*driverConn).(database/sql.releaseConn)-fm(0x0, 0x0)
C:/Go/src/database/sql/sql.go:706 +0x45
database/sql.(*Rows).close(0xc04212a100, 0x899be0, 0xc042048380, 0x0, 0x0)
C:/Go/src/database/sql/sql.go:2932 +0x159
database/sql.(*Rows).awaitDone(0xc04212a100, 0x89d260, 0xc042050b00, 0x0, 0x0)
C:/Go/src/database/sql/sql.go:2588 +0x12f
created by database/sql.(*Rows).initContextClose
C:/Go/src/database/sql/sql.go:2572 +0xa3
FAIL ezsoft/apiserver_sdk/db 0.429s
Error: Tests failed.
使用的第三方库
我使用testify和go-sqlmock(我可能会用它来简单地存根查询，因为我不得不在设置中跳过箍。
我不知道是什么导致了这次失败。当我删除测试并运行套件本身时，一切正常
事实证明，我把这种情况想多了。
我通过将两个行状态存储为指针来修复它，然后将它们设置为RowsSuite.SetupTest(在测试级别，而不是套件级别(。从那里，我只是获取测试中的一个状态，我就可以开始了。也就是说，取而代之的是这个(在C++中可以正常工作(：
func (suite *RowsSuite) TestReadFrom_SanityTest() {
t := suite.T()
rows := new(sql.Rows)
*rows = suite.nonEmptyRows
assert.True(t, rows.Next())
// hit the function like it's supposed to be hit
err := ReadFrom(rows,
suite.fnStubFalse,
suite.spots[0],
suite.spots[1],
suite.spots[2])
// There better be no error
if !assert.Nil(t, err) {
t.Error(err.ToString(false))
}
}
我这样做了：
func (suite *RowsSuite) TestReadFrom_SanityTest() {
t := suite.T()
rows := suite.nonEmptyRows
// hit the function like it's supposed to be hit
errSt := ReadFrom(rows,
suite.fnStubFalse,
suite.spots[0],
suite.spots[1],
suite.spots[2])
// There better be no error
if !assert.Nil(t, errSt) {
t.Error(errSt.ToString(false))
}
}
其中nonEmptyRows是在运行测试之前设置的状态之一