When Should the Test Strategy Be Defined in Product Development?

Test is not something that comes at the end

Test is often associated with verification and final approval. In reality, test should be considered throughout the product development process.

Early test considerations can influence product architecture, component selection, interfaces and software structure. If testing is considered too late, teams may discover that important signals are not accessible, interfaces are poorly defined or the required test coverage is difficult and expensive to achieve.

These issues can lead to redesign of the product, test hardware or custom test fixtures at a stage when changes are more costly and schedules are already under pressure.

What should be defined in a test strategy

A test strategy does not require every detail of the final test system to be decided at the beginning of a development project. However, some fundamental questions should be addressed early:

• What needs to be tested?
• What failures need to be detected?
• What level of test coverage is required?
• Which signals and interfaces need to be accessible for testing?
• What production volumes are expected?
• What test data needs to be collected and stored?
• How should the test solution scale from prototype to series production?

Answering these questions early provides direction for both product development and the eventual production test solution.

From prototype testing to production

The way a product is tested during development may not be suitable for production.

During development, engineers may use laboratory instruments, manual measurements and temporary connections to verify functionality. In production, testing typically needs to be repeatable, efficient and suitable for the expected production volume.

Considering this transition early makes it easier to design the product for testability and develop a test solution that can scale with the product.

For some products, this may mean moving from a relatively simple development setup to dedicated test fixtures, automated measurements and a production test system.

When should an external test partner be involved?

An external test and development partner can be useful before the product design is finalized, particularly when the product will require dedicated test equipment or needs to scale into series production.

Early involvement can help identify practical test requirements, evaluate different approaches and avoid solutions that are either unnecessarily complex or insufficient for production needs.

At Virinco, we work with product owners and engineering teams across product development, embedded systems, industrialization,and production testing. This makes it possible to consider the product and its test strategy together rather than treating production test as a separate activity at the end of development.

Build testability into the product

A good test strategy is not only about choosing test equipment. It is about making sure the product can be tested effectively throughout development and production.

Defining the strategy early can reduce technical risk, support better engineering decisions and make the transition from prototype to stable production more predictable.

Test should therefore not be treated as a final step in product development, but as part of the engineering process from the beginning.

Need help defining your test strategy?

If you are developing a new product, preparing for industrialization or reviewing an existing production test solution, Virinco can help define a test strategy and develop the test solution around your product and production requirements.