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Infrastructure and environment preparation
We are deploying a test environment as close to the combat environment as possible. This allows you to identify compatibility issues in advance and eliminate the risk of release failures.
Defining interaction scenarios
We create test cases covering the key links between modules and services. We check critical business processes: from transaction processing to data synchronization between systems.
Checking the correctness of data exchange
We are testing to ensure that information is transmitted in the correct format, stored losslessly, and processed correctly at all stages. We pay special attention to API calls, integration with external services, and database operation.
Behavior analysis in exceptional situations
We simulate non-standard conditions: overloads, failures of one of the modules, incorrect or missing data. This helps to assess the stability of the system and its ability to respond correctly to errors.
Collecting and analyzing the results
Integration testing is a stage of quality control in which the interaction of individual modules, services, and subsystems is checked. The goal is to make sure that the components communicate correctly, the business logic works smoothly, and the system remains stable even under difficult scenarios.
Unlike unit testing, where a single block of code is tested, integration functional testing analyzes the collaboration of several modules. This allows you to identify errors at the junction of components, API problems, incorrect data storage or transmission.
Incremental — checking modules in stages, with the gradual addition of new components.
Non—incremental (Big Bang) testing of the entire integration after combining all parts of the system.
System integration testing is the verification of the interaction of not only internal modules, but also external services, APIs and databases.
Regression integration testing is the control that new changes have not disrupted the functioning of already tested functions.
Online banking launches a new module "Transfers by phone number". The testers check how the interface transmits data to the API, how the server side stores the transaction in the database, and how the external payment system confirms the transfer. An error is detected during the test: if the number format is incorrect, the API returns an incorrect response.
Integration testing verifies the correctness of the interaction of modules and services within the system. The goal is to make sure that data is transmitted without errors, the logic works consistently, and the application remains stable even under difficult scenarios. For example, when ordering from an online store, a bundle is being tested: the shopping cart interface, order processing, database entry, and integration with a payment service.
On business-critical processes and system interaction points (API, databases, external services, transaction processing). Scenarios are formed based on requirements, architecture, risk analysis, and past defects. For example: "Check that the order is saved in the database and displayed correctly in your merchant profile after successful payment."
Regularly — when adding new features, changing architecture, or connecting third-party services. In CI/CD processes, integration functional testing is performed automatically at each stage of the build. This allows you to detect critical errors in time and reduce the risk of them being included in the release.
Integration testing is aimed at verifying the correctness of interaction between modules, services, and subsystems.: it allows you to identify errors at the junction of components and make sure that data is transmitted and processed without failures. In contrast, regression testing verifies that the changes or corrections made have not disrupted the operation of existing functionality. If integration answers the question "do the modules work together correctly?", then regression answers the question "has everything else remained stable after the changes".
