adding tobis ideas

docs/contributor/testing-strategy.md

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-# Testing Strategy
+# Testing Strategy Infrastructure-Manager
+
+## Introduction
+This testing strategy outlines the approach and methodologies to be used for testing a Kubernetes project built using the Kubebuilder framework. It includes various levels of testing such as unit testing, integration testing, and end-to-end testing to ensure the stability, reliability, and correctness of the project.
+## Testing Levels
+1. **Unit Testing:** Writing and executing tests for individual functions, methods, and components to verify their behavior and correctness in isolation.
+2. **Integration Testing:** Validating the integration and interaction between different components, modules, and services in the project.
+3. **End-to-End Testing:** Testing the application as a whole in a production-like environment, mimicking real-world scenarios to ensure the entire system functions correctly.
+## Testing Tools and Frameworks
+Use the following tools and frameworks to implement the above-mentioned testing levels:
+- **Ginkgo and Gomega**: For writing and executing unit tests with a BDD-style syntax and assertions.
+- **Kubebuilder Test Framework**: For creating and executing integration tests that interact with the Kubernetes cluster.
+- **Helm**: For deploying and managing test clusters and environments for end-to-end testing.
+- **Kubernetes clients for Go**: Use the official Kubernetes client libraries to interact with the Kubernetes API and validate the behavior of the project.
+## Testing Approach
+### Unit Testing
+1. Identify critical functions, methods, and components that require testing.
+2. Write unit tests using Ginkgo and Gomega frameworks.
+3. Ensure tests cover various scenarios, edge cases, and possible failure scenarios.
+4. Test for both positive and negative inputs to validate the expected behavior.
+5. Mock external dependencies and use stubs or fakes to isolate the unit under test.
+6. Run unit tests periodically during development and before each commit to prevent regressions.
+### Integration Testing
+1. Create a separate test suite for integration testing.
+2. Use the Kubebuilder Test Framework to create test cases that interact with the Kubernetes cluster.
+3. Test the interaction and integration of your custom resources, controllers, and other components with the Kubernetes API.
+4. Ensure test cases cover various aspects such as resource creation, updating, deletion, and handling of edge cases.
+5. Validate the correctness of event handling, reconciliation, and other control logic.
+### End-to-End Testing
+1. Use Helm to create, deploy, and manage test clusters and environments that closely resemble the
+
 
 The following CI/CD jobs are a part of the development cycle: