How to Run `go test` in the Parent Directory of Multiple Go Modules?

Running go test in Parent Directory of Multiple Go Modules

When encountering a directory structure with multiple Go modules located in subdirectories, running go test from the parent directory can pose a challenge. The following code snippet demonstrates this issue:

/root
    /one
        go.mod
        go.sum
        main.go
        main_test.go
    /two
        go.mod
        go.sum
        main.go
        main_test.go

Running go test./... from the root directory will result in the error:

go: warning: "./..." matched no packages
no packages to test

This occurs because go test is specifically designed to operate on a single module located either in the current directory or its parent. It does not support nested modules or executing tests from a parent directory of multiple modules.

To resolve this, a solution is to create a shell script or use a utility like find to navigate to each individual module and execute go test within those directories. For example:

cd /root/one
go test .
cd /root/two
go test .

Alternatively, some projects may utilize a Makefile or test.sh script to automate this process. For instance, the test.sh script in the following hypothetical project loops through a list of modules and runs go test for each directory:

#!/bin/bash

modules="one two three"

for module in $modules; do
    cd $module
    go test .
    cd ..
done

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