How Can I Effectively Test My Go App Engine Applications?

Testing Go AppEngine Applications

When developing Go applications for AppEngine, writing test cases can be crucial. The Go standard test package may not suffice, as it doesn't allow calls to the HTTP endpoint.

Solution: github.com/mzimmerman/appenginetesting

Installation:

Follow the installation steps outlined below to set up appenginetesting:

1. Install Go and set the environmental variables.
2. Download the Google App Engine SDK for Go and set the environmental variables.
3. Symlink the appengine and appengine_internal directories.
4. Install appenginetesting using go get github.com/mzimmerman/appenginetesting.

Writing Tests with appenginetesting

To write tests using appenginetesting, create a test directory for each package you want to test. In each test directory, provide a *.go file with the following structure:

hello_test.go

In this file, you can import appengine from github.com/mzimmerman/appenginetesting:

import "github.com/mzimmerman/appenginetesting"
...

Next, create a fake appengine.Context:

c := appenginetesting.NewContext(nil)

Use c as you would use an actual appengine.Context. However, note that this approach only works with contexts created using appenginetesting.NewContext. Contexts created with appengine.NewContext(r) cannot be used with appenginetesting.

To prevent ongoing Python processes, explicitly close the context:

defer c.Close()

More examples and resources are available in the official appenginetesting documentation.

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