Integration Testing is a testing method by which components are integrated to form a functional solution. This type of Integration testing focuses on the transfer of data across an interface between a source and target systems, a complete transaction or request could in fact run across dozens of interfaces and components. As such the most practical way to test a large integrated solution would be to slice it up into smaller points and functional clusters.

Bottom Up Testing is an approach to integrated testing where the lowest level components are tested first, then used to facilitate the testing of higher level components. The process is repeated until the component at the top of the hierarchy is tested.

All the bottom or low-level modules, procedures or functions are integrated and then tested. After the integration testing of lower level integrated modules, the next level of modules will be formed and can be used for integration testing. This approach is helpful only when all or most of the modules of the same development level are ready. This method also helps to determine the levels of software developed and makes it easier to report testing progress in the form of a percentage.

Top Down Testing is an approach to integrated testing where the top integrated modules are tested and the branch of the module is tested step by step until the end of the related module.
The key to a successful integration is knowing your technology, company offering, system environments and test data. The ability to measure the breadth and depth of your test scenarios by way of mapping them to requirements and design.

This is the difference DX brings to the industry, the ability to prove testing coverage and reduce production related faults: which reduce customer churn and increase customer experience.

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