How to Run Multiple Package Tests in Go Sequentially?

Running Multiple Package Tests in Go

When running tests in multiple packages under a subdirectory using go test ./..., users may encounter issues if the tests rely on global variables and database interactions. This is because the tests are executed concurrently, potentially causing conflicts and failures.

Causes of the Issue

The main cause of the problem is that tests in different packages are run in parallel, even when -parallel 1 is specified. This leads to potential contention for shared resources, such as global variables and database connections.

Solution

Using go test -p 1 (Undocumented Flag)

As suggested by @Gal Ben-Haim, the undocumented flag go test -p 1 can be used to force all packages to be built and tested in serial. This ensures that the tests are executed sequentially, preventing any conflicts.

Custom Shell Script or Alias

If using an undocumented flag is not preferred, a custom shell script or alias can be created to emulate the behavior of go test ./... while forcing sequential execution. For example:

<code class="bash">find . -name '*.go' -printf '%h\n' | sort -u | xargs -n1 -P1 go test</code>

Example Setup and Teardown Functions

Here's an example of how setup and teardown functions can be used to handle database setup and cleanup:

<code class="go">var session *mgo.Session
var db *mgo.Database

func setUp() {
  s, err := cfg.GetDBSession()
  if err != nil {
    panic(err)
  }

  session = s
  db = cfg.GetDB(session)
  db.DropDatabase()
}

func tearDown() {
  db.DropDatabase()
  session.Close()
}</code>

Conclusion

To ensure sequential execution of tests for multiple packages, users can either use the undocumented flag go test -p 1 or create a custom shell script or alias that runs the tests in order. By implementing this approach, conflicts and failures caused by parallel execution can be avoided.

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