Add test target

This adds the test target to run the required tests. The test
target can be invoked via: `make -f Next.mk test`. This target
runs test via bazel.

The bazel command is provided via bazelisk so we can pick up
the right bazel version (hint: .bazelversion).

Before running the test, we generate the required *.go files
via tests_harness_cases_go (which is a dependency of test target).

This patch adds test target invocation in the workflow, also
sets up the corresponding caching mechanism for bazel.

Signed-off-by: Dhi Aurrahman <[email protected]>

Author: dio

.github/workflows/commit.yaml

@@ -30,8 +30,17 @@ jobs:
           go-version: "1.19.3"
           cache: true
 
+      - name: Download cache for bazel
+        uses: actions/cache@v3
+        with:
+          path: "~/.cache/bazel"
+          key: test-${{ runner.os }}-bazel-cache
+
       - name: "Generate *.pb.go and build the plugin binary"
-        run: make -f Next.mk clean build # we do "clean build" here, hence *.pb.go is regenerated.
+        run: make -f Next.mk clean build # we do "clean build" here, hence validate.pb.go is regenerated.
 
       - name: "Verify clean check-in"
-        run: make -f Next.mk check
+        run: make -f Next.mk check # we do verification after validate.pb.go is regenerated.
+
+      - name: "Run tests"
+        run: make -f Next.mk test

Next.mk

@@ -31,6 +31,13 @@ export PATH := $(root_dir)$(current_binary_path):$(go_tools_dir)/bin:$(prepackag
 # The main generated file.
 validate_pb_go := validate/validate.pb.go
 
+# List of harness test cases.
+tests_harness_cases := \
+	/harness \
+	/harness/cases \
+	/harness/cases/other_package \
+	/harness/cases/yet_another_package
+
 # Include versions of tools we build on-demand
 include Tools.mk
 # This provides the "help" target.
@@ -42,8 +49,12 @@ include tools/build/Env.mk
 protoc := $(prepackaged_tools_dir)/bin/protoc
 
 # Go based tools.
+bazel         := $(go_tools_dir)/bin/bazelisk
 protoc-gen-go := $(go_tools_dir)/bin/protoc-gen-go
 
+test: $(bazel) $(tests_harness_cases) ## Run tests
+	@$(bazel) test //tests/... --test_output=errors
+
 build: $(current_binary) ## Build the plugin
 
 clean: ## Clean all build and test artifacts
@@ -65,4 +76,22 @@ $(validate_pb_go): $(protoc) $(protoc-gen-go) validate/validate.proto
 build/$(name)_%/$(name)$(goexe): $(validate_pb_go)
 	@GOBIN=$(root_dir)$(current_binary_path) $(go) install .
 
+# Generate all required files for harness tests in Go.
+$(tests_harness_cases): $(current_binary)
+	$(call generate-test-cases-go,tests$@)
+
+# Generates a test-case for Go.
+define generate-test-cases-go
+	@cd $1 && \
+	mkdir -p go && \
+	$(protoc) \
+		-I . \
+		-I $(root_dir) \
+		--go_opt=paths=source_relative \
+		--go_out=go \
+		--validate_opt=paths=source_relative \
+		--validate_out=lang=go:go \
+		*.proto
+endef
+
 include tools/build/Installer.mk

Tools.mk

@@ -1,4 +1,5 @@
 # Licensed under the Apache License, Version 2.0 (the "License")
 
+bazelisk@v      := github.com/bazelbuild/[email protected]
 protoc@v        := github.com/protocolbuffers/[email protected]
 protoc-gen-go@v := google.golang.org/protobuf/cmd/[email protected]