[ggj][infra][1/5] integration-test: add goldens files for Redis client library

test/integration/goldens/README.md

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+# Goldens Files For Integration Test
+
+This folder contains goldens files that are expected to be generated from Java Microgenerator
+against differenct APIs. For example `redis` folder has all the Java source files in the generated 
+Redis client library. They are all actual Java files, but used as goldens.
+
+## Purpose
+
+When running integration test for the Java Microgenerator using the below command, 
+the goldens files in this folder will be used to compare with the actual generated Java source files.
+If they are not identical, then the integration test will fail.
+
+```sh
+bazel test //test/integration:redis_java_gapic
+```
+
+## How To Update Goldens
+
+If the actual generated Java source files are not identical with the goldens files, and we want to
+update the goldens using source files. Run the command below to overwrite the goldens files in `redis` folder.
+
+```sh
+bazel run //test/integration:redis_goldens_update
+```

test/integration/goldens/redis/BUILD.bazel

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+package(default_visibility = ["//visibility:public"])
+
+filegroup(
+    name = "redis_goldens_files",
+    srcs = glob(["*.java"]),
+)