How to Avoid \'flag provided but not defined\' Errors When Using Custom Command Line Flags in Go Unit Tests?-Golang-php.cn

Home

Backend Development

Golang

How to Avoid \'flag provided but not defined\' Errors When Using Custom Command Line Flags in Go Unit Tests?

Susan Sarandon

Dec 03, 2024 am 07:42 AM

How to Avoid

Custom Command Line Flags in Go's Unit Tests

Issue

When utilizing custom command line flags in Go's unit tests, users may encounter an error stating, "flag provided but not defined" when running tests with command line arguments.

Problem

The issue arises when multiple tests are included in a workspace using the ./... pattern. In this scenario, the compiler executes several test executables, each of which may have different flag requirements. The error occurs because some executables attempt to use undefined flags.

Solution

To resolve this issue, it is recommended to run go test individually for each _test.go file, providing the appropriate set of command line arguments for each test. This approach ensures that each executable receives only the expected flags, avoiding the undefined flag error.

The above is the detailed content of How to Avoid \'flag provided but not defined\' Errors When Using Custom Command Line Flags in Go Unit Tests?. For more information, please follow other related articles on the PHP Chinese website!

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Type Assertions and Type Switches with Go InterfacesMay 02, 2025 am 12:20 AM

Gohandlesinterfacesandtypeassertionseffectively,enhancingcodeflexibilityandrobustness.1)Typeassertionsallowruntimetypechecking,asseenwiththeShapeinterfaceandCircletype.2)Typeswitcheshandlemultipletypesefficiently,usefulforvariousshapesimplementingthe

Using errors.Is and errors.As for Error Inspection in GoMay 02, 2025 am 12:11 AM

Go language error handling becomes more flexible and readable through errors.Is and errors.As functions. 1.errors.Is is used to check whether the error is the same as the specified error and is suitable for the processing of the error chain. 2.errors.As can not only check the error type, but also convert the error to a specific type, which is convenient for extracting error information. Using these functions can simplify error handling logic, but pay attention to the correct delivery of error chains and avoid excessive dependence to prevent code complexity.

Performance Tuning in Go: Optimizing Your ApplicationsMay 02, 2025 am 12:06 AM

TomakeGoapplicationsrunfasterandmoreefficiently,useprofilingtools,leverageconcurrency,andmanagememoryeffectively.1)UsepprofforCPUandmemoryprofilingtoidentifybottlenecks.2)Utilizegoroutinesandchannelstoparallelizetasksandimproveperformance.3)Implement

The Future of Go: Trends and DevelopmentsMay 02, 2025 am 12:01 AM

Go'sfutureisbrightwithtrendslikeimprovedtooling,generics,cloud-nativeadoption,performanceenhancements,andWebAssemblyintegration,butchallengesincludemaintainingsimplicityandimprovingerrorhandling.

Understanding Goroutines: A Deep Dive into Go's ConcurrencyMay 01, 2025 am 12:18 AM

GoroutinesarefunctionsormethodsthatrunconcurrentlyinGo,enablingefficientandlightweightconcurrency.1)TheyaremanagedbyGo'sruntimeusingmultiplexing,allowingthousandstorunonfewerOSthreads.2)Goroutinesimproveperformancethrougheasytaskparallelizationandeff

Understanding the init Function in Go: Purpose and UsageMay 01, 2025 am 12:16 AM

ThepurposeoftheinitfunctioninGoistoinitializevariables,setupconfigurations,orperformnecessarysetupbeforethemainfunctionexecutes.Useinitby:1)Placingitinyourcodetorunautomaticallybeforemain,2)Keepingitshortandfocusedonsimpletasks,3)Consideringusingexpl

Understanding Go Interfaces: A Comprehensive GuideMay 01, 2025 am 12:13 AM

Gointerfacesaremethodsignaturesetsthattypesmustimplement,enablingpolymorphismwithoutinheritanceforcleaner,modularcode.Theyareimplicitlysatisfied,usefulforflexibleAPIsanddecoupling,butrequirecarefulusetoavoidruntimeerrorsandmaintaintypesafety.

Recovering from Panics in Go: When and How to Use recover()May 01, 2025 am 12:04 AM

Use the recover() function in Go to recover from panic. The specific methods are: 1) Use recover() to capture panic in the defer function to avoid program crashes; 2) Record detailed error information for debugging; 3) Decide whether to resume program execution based on the specific situation; 4) Use with caution to avoid affecting performance.

See all articles