Making Bats optional.

docs/proposals/cli.md

@@ -11,7 +11,7 @@ reviewers:
 approvers:
   - TBD
 creation-date: 2020-10-07
-last-updated:  2020-11-23
+last-updated:  2020-11-25
 status: provisional
 ---
 
@@ -175,11 +175,12 @@ The testing structure will be composed of:
 
 - **Unit**: written in Golang and using [Gomega](https://onsi.github.io/gomega/) for assertion;
 - **End-to-End**: written in Golang and located at the traditional `test/e2e` directory;
-- **System**: written using Bats framework (Bash);
+- **System**: written using Bats framework (Bash), or similar approach;
 
 Bats will also be helpful for a future `shp` container-image, we are able to mount the Bats files
 in the container-image produced, and run our system testing against it. Therefore, Bats covers
-testing of a local command-line binary, as well as it does a container-image.
+testing of a local command-line binary, as well as it does a container-image. Another tool may take
+Bats' place, covering the same test-use cases accordingly.
 
 ## Releasing