What needs to happen?

This task is for the first stage of this proposal - https://docs.google.com/document/d/123Xow_YFGRi-Z37NCRIsfiX-fvzYQ7uVM9d3_0y6fO8

• 1. Domains that are missing all test coverage should be worked on first - PR#34654 - PR#34692
• 2. Core transform areas - PR#34654 - PR#34692
• 3. Any other transforms missing.
• 4. Improving existing transforms tests that are missing some test parameters.
• 5. Improving documentation. For example, add note to this location that all examples are tested.

Issue Priority

Priority: 2 (default / most normal work should be filed as P2)

Issue Components

• Component: Python SDK
• Component: Java SDK
• Component: Go SDK
• Component: Typescript SDK
• Component: IO connector
• Component: Beam YAML
• Component: Beam examples
• Component: Beam playground
• Component: Beam katas
• Component: Website
• Component: Infrastructure
• Component: Spark Runner
• Component: Flink Runner
• Component: Samza Runner
• Component: Twister2 Runner
• Component: Hazelcast Jet Runner
• Component: Google Cloud Dataflow Runner