I am writing units test. I put all of the test files in other directory. Let's say the folder mypack.
There two files in the folder fun1_test.go and base.go.
The base.go has same common basic functions which are called by fun1_test.go. The base.go looks like:
package mypack_test
import (
.....
)
func Base1() {
// some code
}
The func1_test.go has functions which test func1. The func1_test.go looks like:
package mypack_test
import (
.....
)
func TestFunc1() {
// some code
Base1()
// some code
}
When I use command
go test func1_test.go base.go
There will be an error:
can't load package: package main: found packages mypack (func1_test.go) and mypack_test (base.go)
Can any one tell me why this happend. I know If the change the file base.go to base_test.go. The command will work ok. But I want to know why.
UPDATE:
I notice some of you guys misunderstanding the problem. The problem is not about if the two file need the other packages or one can call one.
The problem is that: If you have two file with same package, the package name looks like xxx_test. But the two files' name are yyy_test.go and zzz.go. When using go test yyy_test.go zzz.go command, there will be an error said they two file not in same packages.
The error are: can't load package: package main: found packages xxx (yyy_test.go) and xxx_test (zzz.go)
You should follow go's best practices.
That is:
Package names should contain only letters with no underscores.
Test file should be name of original file + test like: base.go - base_test.go.
Run test by going to packages directory and running go test.
If you make those changes, your tests should run without any problems.
If you checkout the go help test command there is this:
Test files that declare a package with the suffix "_test" will be compiled as a separate package, and then linked and run with the main test binary.
What is happening is that your file yyy_test.go is recognised as a test file because of its _test.go ending. The package defined in that file package xxx_test is considered to be the test version of the xxx package.
See this stack answer for desc: https://stackoverflow.com/a/31443271/6376471
Then, along comes zzz.go which is not recognised as a test file, because it's missing the _test.go suffix, it has a packge xxx_test which is not considered to be a test package.
This means that essentially you are defining the packages xxx_test from zzz.go and xxx from yyy_test.go, even though yyy_test.go actually defines xxx_test, but it's in a test file so handled differently.
Solutions:
zzz.go as a test file by making it zzz_test.go.zzz.go to have the non test package name package xxx instead of package xxx_test.