Testing code is inherently challenging due to the variability in developer environments and the complexities of ensuring consistent test results across systems. Docker offers a solution by standardizing application deployment through containerization, ensuring uniformity across various platforms. Docker Compose further simplifies this by allowing developers to define their entire application environment in a single configuration file, enabling rapid creation of identical development environments. This approach is especially beneficial for large teams, as it allows developers to easily set up environments without the need for extensive manual configuration. Moreover, Docker Compose facilitates the separation of development and test environments, preventing conflicts that could arise from running them simultaneously on the same hardware. Integrating Docker with Continuous Integration/Continuous Deployment (CI/CD) enhances this process, as Docker-native solutions like Codefresh streamline testing and deployment, reducing bugs and accelerating release cycles. This integration supports consistent testing configurations across local and CI/CD environments, making it easier for developers to inject local code into test environments and choose the appropriate software versions for testing.