将仅在测试文件中引用的测试代码编译为二进制文件吗？

Question

I am wondering what code will be compiled into the go binary if you compile a binary using go build ./... . This will compile a binary that has a cli program. For this cli program, I have test code and non test code. I currently have several flavours of test code:

• foo_test.go in package foo_test
• foo_internal_test.go in package foo
• testutil.go in package testutil that provides test utility functions

No test code is actually referenced in the non test code. The testutil functions are only imported in the test files.

If the test code is infact compiled into the binary , how much of a problem is this?

Answer 1

A go binary only includes code reachable from its main() entry point. For test binaries main() is the test runner.

As to "how much of a problem" it is if it were included... none. It would increase the binary size and compilation time somewhat but otherwise have no impact - code that isn't executed, by definition, does nothing.