单元测试代码：=运行时错误：无效的内存地址或零指针取消引用

Question

我已经创建了一个工作正常的 API，但出现了类似的错误

运行时错误：无效的内存地址或零指针取消引用

当执行单元测试代码时。

完整回复供您参考

runtime error: invalid memory address or nil pointer dereference

D:/Go/src/runtime/panic.go:199 (0x447473)

    panicmem: panic(memoryError)

D:/Go/src/runtime/signal_windows.go:233 (0x447320)

    sigpanic: panicmem()

D:/Projects/GoLang/cloudfactory-backend/db/teams.go:11 (0xb49b36)

    SelectAllTeams: func SelectAllTeams() (teams []models.Team, err error) {

D:/Projects/GoLang/cloudfactory-backend/services/teams.go:11 (0xbb09ec)

    GetTeams: teams, err = db.SelectAllTeams()

D:/Projects/GoLang/cloudfactory-backend/controllers/api.go:32 (0xbb1b51)

    ApiController.GetTeams: teams, err := services.GetTeams()

C:/Users/justin.joseph/go/pkg/mod/github.com/gin-gonic/gin@v1.4.0/context.go:124 (0x9f7da1)

    (*Context).Next: c.handlers[c.index](c)

D:/Projects/GoLang/cloudfactory-backend/middlewares/db_logger.go:72 (0xc30430)

    DBLogger.func1: c.Next()

C:/Users/justin.joseph/go/pkg/mod/github.com/gin-gonic/gin@v1.4.0/context.go:124 (0x9f7da1)

    (*Context).Next: c.handlers[c.index](c)

C:/Users/justin.joseph/go/pkg/mod/github.com/gin-gonic/gin@v1.4.0/recovery.go:83 (0xa0b2ca)

    RecoveryWithWriter.func1: c.Next()

C:/Users/justin.joseph/go/pkg/mod/github.com/gin-gonic/gin@v1.4.0/context.go:124 (0x9f7da1)

    (*Context).Next: c.handlers[c.index](c)

C:/Users/justin.joseph/go/pkg/mod/github.com/gin-gonic/gin@v1.4.0/logger.go:240 (0xa0a357)

    LoggerWithConfig.func1: c.Next()

C:/Users/justin.joseph/go/pkg/mod/github.com/gin-gonic/gin@v1.4.0/context.go:124 (0x9f7da1)

    (*Context).Next: c.handlers[c.index](c)

C:/Users/justin.joseph/go/pkg/mod/github.com/gin-gonic/gin@v1.4.0/gin.go:389 (0xa01798)

    (*Engine).handleHTTPRequest: c.Next()

 C:/Users/justin.joseph/go/pkg/mod/github.com/gin-gonic/gin@v1.4.0/gin.go:351 (0xa00fba)

    (*Engine).ServeHTTP: engine.handleHTTPRequest(c)

Answer 1

在D:/Projects/GoLang/cloudfactory-backend/db/teams.go在线中11，您从零指针引用字段。如果没有完整的源代码（包括行号），就不可能精确定位，但它可能DBCon没有被初始化。