Remove retired docs E2E test scaffolding

test/README.md

@@ -6,35 +6,16 @@ _build:
 
 # Test
 
-This directory contains tests and testing docs.
+This directory contains repository tests and presubmit helpers.
 
-- [Unit tests](#running-unit-tests) currently reside in the codebase alongside
-  the code they test
-- [End-to-end tests](#running-end-to-end-tests)
+## Running Go tests
 
-## Running unit tests
-
-TODO(#66): Write real unit tests.
-
-## Running end-to-end tests
-
-### Dependencies
-
-You might need to install `kubetest` in order to run the end-to-end tests
-locally:
+From the repository root:
 
 ```bash
-go get -u k8s.io/test-infra/kubetest
+go test ./...
 ```
 
-Simply run the `e2e-tests.sh` script, setting `$PROJECT_ID` first to your GCP
-project. The script will create a GKE cluster, install Knative, run the
-end-to-end tests and delete the cluster.
-
-If you already have a cluster set, ensure that `$PROJECT_ID` is empty and call
-the script with the `--run-tests` argument. Note that this requires you to have
-Knative Build installed and configured to your particular configuration setup.
-
 ---
 
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