Add README introducing e2e plugin test scenarios
Feature: Issue 12811
Change-Id: I936aa81fe12b61f26b26c7221b77d8a33b7a4bc2
diff --git a/src/test/README.md b/src/test/README.md
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+# About this directory structure
+
+```bash
+ ./resources/com
+ ./scala
+```
+
+To start using the files under these directories above, consider the
+[instructions](https://gerrit-documentation.storage.googleapis.com/Documentation/2.16.19/dev-e2e-tests.html)
+on how to use Gerrit core's Gatling framework. These are about running
+non-core test scenarios such as this plugin one below:
+
+```bash
+ sbt "gatling:testOnly com.ericsson.gerrit.plugins.gcconductor.scenarios.CreateChangesTriggeringGc"
+
+```
+
+This is a scenario that can serve as an example for how to start testing
+this plugin, along with its executor component. Both of these components
+should be locally installed along with default configuration. Plugin's
+gc-executor component is assumed to be running alongside Gerrit.
+
+Scenario scala source files and their companion json resource ones are
+stored under the usual src/test directories. That structure follows the
+scala package one from the scenario classes. The core framework expects
+such a directory structure for both the scala and resources (json data)
+files.
