How Can I Run Go Tests for Specific Packages While Excluding Others?

Testing Specific Packages While Excluding Others

Go's "go test" command allows developers to execute tests within a project. However, there may be scenarios where testing certain packages or directories is unnecessary or undesirable. This question explores the possibility of skipping specific directories from testing.

Answer:

1. Explicit Invocation:

One method is to use explicit invocations of "go test" for each package to be tested. For instance, given the structure presented:

mypackage
mypackage/net
mypackage/other
mypackage/scripts

Tests can be run on "mypackage," "mypackage/other," and "mypackage/net" while excluding "mypackage/scripts" by executing the following commands:

cd mypackage
go test
cd net
go test
cd other
go test

It is also possible to provide a comma-separated list of packages to test, including directory paths:

go test mypackage,mypackage/other,mypackage/net

2. Shell-Based Invocation:

Depending on the shell being used, it is possible to invoke multiple tests using wildcard expansion. For example, with Bash or Zsh:

go test mypackage/{,other,net}

3. Exclusion Using "go list":

"go list" can be utilized to list all packages that would normally be tested. By piping the output through grep and excluding unwanted directories, a filtered list can be obtained. This list can then be passed to "go test":

go test $(go list ./... | grep -v directoriesToSkip)

4. Using testing.Short() Flag:

If tests are skipped due to their length or cost, the "testing.Short()" flag can be employed. Tests that meet a certain condition can check "testing.Short()" and call "t.Skip()" to exclude themselves from testing.

To skip tests in "mypackage," the following can be used:

go test -short mypackage/

or

go test -short ./...

By utilizing these techniques, developers can selectively run tests on desired packages while excluding others. This flexibility can improve efficiency and convenience in the testing process.

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