OC 单元测试学习笔记

UnitTest 编译异常汇总：

问题1

Check dependencies

No architectures to compile for (ONLY_ACTIVE_ARCH=YES, active arch=x86_64, VALID_ARCHS=i386).

经过与正常 test target 设置比较，默认设置中 Debug architecture 只有armv7， 添加 arm64以后 Test build 即成功；

问题2

ld: -bundle_loader can only be used with -bundle

clang: error: linker command failed with exit code 1 (use -v to see invocation)

Mach-O 是 mac OS 上的可执行文件格式，在xcode help 文档中，具体是这样描述的，测试target 需选择 Bundle：

问题3

跑test target 碰到如下错误：

ld: entry point (_main) undefined. for architecture armv7

clang: error: linker command failed with exit code 1 (use -v to see invocation)

在test target 中 ， General Tab， 把 Allow testing Host Application APIs 复选框勾上即解决了此问题。

附录：

Mach-O Type (MACH_O_TYPE)

This setting determines the format of the produced binary and how it can be linked when building other binaries. For information on binary types, see Building Mach-O Files in Mach-O Programming Topics.

• Executable: Executables and standalone binaries and cannot be linked. mh_execute
• Dynamic Library: Dynamic libraries are linked at build time and loaded automatically when needed. mh_dylib
• Bundle: Bundle libraries are loaded explicitly at run time. mh_bundle
• Static Library: Static libraries are linked at build time and loaded at execution time. staticlib
• Relocatable Object File: Object files are single-module files that are linked at build time. mh_object