How to Guarantee Sequential Test Execution in Go When Dealing with Database Initialization?

How to Ensure Sequential Execution of Go Tests

When running go test, it is observed that tests intermittently fail, passing only on subsequent runs. This behavior is attributed to database initialization issues. Specifically, POST requests that create data in the DB are not consistently run before GET requests that rely on this data. As a result, GET requests fail when executed against an empty database.

Why Test Execution Order is Undefinable

In Go, the order of test execution is not guaranteed. Tests can be skipped or excluded based on flags, making it unreliable to assume sequential execution.

Solutions for Sequential Initialization

To ensure that tests run in a specific order, it is crucial to make tests independent of each other and avoid relying on dependencies between them. However, for cases where prerequisites are necessary, the following options can be considered:

• Test Function Initialization: Place the initialization code within the test function itself.
• package init() Function: Initialize the required data in the init() function of the _test.go file. This will run once before any test functions.
• TestMain() Function: Implement a TestMain() function to handle initialization and setup before executing test functions.
• Combination of Options: Combine the above approaches as needed.

Specific Recommendation for Database Initialization

In the given scenario, it is advisable to check if the database is initialized within the package init() or TestMain() function. If not, insert test records before running any tests.

Note on Subtests

Subtests introduced in Go 1.7 allow for more granular control over test execution order within a single function. However, this feature should be used with caution to avoid introducing unintended dependencies between tests.

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