Merge pull request #16 from arangodb/testing-design

Adding test design

docs/design/testing.md

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+# Testing
+
+## Scenario's
+
+The following test scenario's must be covered by automated tests:
+
+- Creating 1 deployment (all modes, all environments, all storage engines)
+- Creating multiple deployments (all modes, all environments, all storage engines),
+  controlling each individually
+- Creating deployment with/without authentication
+- Creating deployment with/without TLS
+
+- Updating deployment wrt:
+  - Number of servers (scaling, up/down)
+  - Image version (upgrading, downgrading within same minor version range (e.g. 3.2.x))
+  - Immutable fields (should be reset automatically)
+
+- Resilience:
+  - Delete individual pods
+  - Delete individual PVCs
+  - Delete individual Services
+  - Delete Node
+  - Restart Node
+  - API server unavailable
+
+## Test environments
+
+- Kubernetes clusters
+  - Single node
+  - Multi node
+  - Access control mode (RBAC, ...)
+  - Persistent volumes ...