build(tests): require //go:build test tag if importing test packages outside of _test.go files

.golangci.yml

@@ -15,6 +15,11 @@ run:
   # By default, it isn't set.
   modules-download-mode: readonly
 
+  # Include non-test files tagged as test-only.
+  # Context: https://github.com/ava-labs/avalanchego/pull/3173
+  build-tags:
+    - test
+
 output:
   # Make issues output unique by line.
   # Default: true

.vscode/settings.json

@@ -0,0 +1,11 @@
+{
+    "gopls": {
+        "build.buildFlags": [
+            // Context: https://github.com/ava-labs/avalanchego/pull/3173
+            // Without this tag, the language server won't build the test-only
+            // code in non-_test.go files.
+            "--tags='test'",
+        ],
+    },
+    "go.testTags": "test",
+}

cache/test_cacher.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package cache
 
 import (

chains/atomic/test_shared_memory.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package atomic
 
 import (

codec/test_codec.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package codec
 
 import (

database/benchmark_database.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package database
 
 import (

database/test_database.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package database
 
 import (

ids/test_aliases.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package ids
 
 import "github.com/stretchr/testify/require"

scripts/build_fuzz.sh

@@ -28,7 +28,7 @@ do
         echo "Fuzzing $func in $file"
         parentDir=$(dirname "$file")
         # If any of the fuzz tests fail, return exit code 1
-        if ! go test "$parentDir" -run="$func" -fuzz="$func" -fuzztime="${fuzzTime}"s; then
+        if ! go test -tags test "$parentDir" -run="$func" -fuzz="$func" -fuzztime="${fuzzTime}"s; then
             failed=true
         fi
     done

scripts/build_test.sh

@@ -18,4 +18,4 @@ fi
 TEST_TARGETS="$(eval "go list ./... ${EXCLUDED_TARGETS}")"
 
 # shellcheck disable=SC2086
-go test -shuffle=on -race -timeout="${TIMEOUT:-120s}" -coverprofile="coverage.out" -covermode="atomic" ${TEST_TARGETS}
+go test -tags test -shuffle=on -race -timeout="${TIMEOUT:-120s}" -coverprofile="coverage.out" -covermode="atomic" ${TEST_TARGETS}

scripts/lint.sh

@@ -29,7 +29,7 @@ fi
 # by default, "./scripts/lint.sh" runs all lint tests
 # to run only "license_header" test
 # TESTS='license_header' ./scripts/lint.sh
-TESTS=${TESTS:-"golangci_lint license_header require_error_is_no_funcs_as_params single_import interface_compliance_nil require_no_error_inline_func"}
+TESTS=${TESTS:-"golangci_lint license_header require_error_is_no_funcs_as_params single_import interface_compliance_nil require_no_error_inline_func import_testing_only_in_tests"}
 
 function test_golangci_lint {
   go install -v github.com/golangci/golangci-lint/cmd/golangci-lint@v1.58.1
@@ -86,6 +86,31 @@ function test_interface_compliance_nil {
   fi
 }
 
+function test_import_testing_only_in_tests {
+  ROOT=$( git rev-parse --show-toplevel )
+  NON_TEST_GO_FILES=$( find "${ROOT}" -iname '*.go' ! -iname '*_test.go');
+
+  IMPORT_TESTING=$( echo "${NON_TEST_GO_FILES}" | xargs grep -lP '^\s*(import\s+)?"testing"');
+  IMPORT_TESTIFY=$( echo "${NON_TEST_GO_FILES}" | xargs grep -l '"github.com/stretchr/testify');
+  # TODO(arr4n): send a PR to add support for build tags in `mockgen` and then enable this.
+  # IMPORT_GOMOCK=$( echo "${NON_TEST_GO_FILES}" | xargs grep -l '"go.uber.org/mock');
+  HAVE_TEST_LOGIC=$( printf "%s\n%s" "${IMPORT_TESTING}" "${IMPORT_TESTIFY}" );
+
+  TAGGED_AS_TEST=$( echo "${NON_TEST_GO_FILES}" | xargs grep -lP '^\/\/go:build\s+(.+(,|\s+))?test[,\s]?');
+
+  # -3 suppresses files that have test logic and have the "test" build tag
+  # -2 suppresses files that are tagged despite not having detectable test logic
+  UNTAGGED=$( comm -23 <( echo "${HAVE_TEST_LOGIC}" | sort -u ) <( echo "${TAGGED_AS_TEST}" | sort -u ) );
+  if [ -z "${UNTAGGED}" ];
+  then
+    return 0;
+  fi
+
+  echo "Non-test Go files importing test-only packages MUST have '//go:build test' tag:";
+  echo "${UNTAGGED}";
+  return 1;
+}
+
 function run {
   local test="${1}"
   shift 1

scripts/tests.e2e.existing.sh

@@ -22,7 +22,7 @@ function print_separator {
 function cleanup {
   print_separator
   echo "cleaning up reusable network"
-  ginkgo -v ./tests/e2e/e2e.test -- --stop-network
+  ginkgo -v --tags test ./tests/e2e/e2e.test -- --stop-network
 }
 trap cleanup EXIT
 

scripts/tests.e2e.sh

@@ -23,7 +23,7 @@ source ./scripts/constants.sh
 echo "building e2e.test"
 # to install the ginkgo binary (required for test build and run)
 go install -v github.com/onsi/ginkgo/v2/ginkgo@v2.13.1
-ACK_GINKGO_RC=true ginkgo build ./tests/e2e
+ACK_GINKGO_RC=true ginkgo build --tags test ./tests/e2e
 ./tests/e2e/e2e.test --help
 
 # Enable subnet testing by building xsvm
@@ -57,4 +57,4 @@ fi
 
 #################################
 # - Execute in random order to identify unwanted dependency
-ginkgo ${GINKGO_ARGS} -v --randomize-all ./tests/e2e/e2e.test -- "${E2E_ARGS[@]}" "${@}"
+ginkgo ${GINKGO_ARGS} -v --tags test --randomize-all ./tests/e2e/e2e.test -- "${E2E_ARGS[@]}" "${@}"

scripts/tests.upgrade.sh

@@ -66,7 +66,7 @@ source ./scripts/constants.sh
 echo "building upgrade.test"
 # to install the ginkgo binary (required for test build and run)
 go install -v github.com/onsi/ginkgo/v2/ginkgo@v2.13.1
-ACK_GINKGO_RC=true ginkgo build ./tests/upgrade
+ACK_GINKGO_RC=true ginkgo build --tags test ./tests/upgrade
 ./tests/upgrade/upgrade.test --help
 
 #################################

snow/consensus/snowball/test_snowflake.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package snowball
 
 import "testing"

snow/engine/avalanche/bootstrap/queue/test_job.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package queue
 
 import (

snow/engine/avalanche/bootstrap/queue/test_parser.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package queue
 
 import (

snow/engine/avalanche/vertex/test_builder.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package vertex
 
 import (

snow/engine/avalanche/vertex/test_manager.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package vertex
 
 import "testing"

snow/engine/avalanche/vertex/test_parser.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package vertex
 
 import (

snow/engine/avalanche/vertex/test_storage.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package vertex
 
 import (

snow/engine/avalanche/vertex/test_vm.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package vertex
 
 import (

snow/engine/common/test_bootstrap_tracker.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package common
 
 import (

snow/engine/common/test_bootstrapper.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package common
 
 import (

snow/engine/common/test_engine.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package common
 
 import (

snow/engine/common/test_sender.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package common
 
 import (

snow/engine/common/test_timer.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package common
 
 import (

snow/engine/common/test_vm.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package common
 
 import (

snow/engine/snowman/block/test_batched_vm.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package block
 
 import (

snow/engine/snowman/block/test_state_summary.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package block
 
 import (

snow/engine/snowman/block/test_state_syncable_vm.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package block
 
 import (

snow/engine/snowman/block/test_vm.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package block
 
 import (

snow/networking/benchlist/test_benchable.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package benchlist
 
 import (

snow/networking/sender/test_external_sender.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package sender
 
 import (

snow/snowtest/snowtest.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package snowtest
 
 import (

snow/validators/test_state.go

@@ -1,6 +1,9 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+// TODO: https://github.com/ava-labs/avalanchego/issues/3174
+//go:build test || !test
+
 package validators
 
 import (

tests/e2e/banff/suites.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 // Implements tests for the banff network upgrade.
 package banff
 

tests/e2e/c/dynamic_fees.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package c
 
 import (

tests/e2e/c/interchain_workflow.go

@@ -1,6 +1,8 @@
 // Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
 // See the file LICENSE for licensing terms.
 
+//go:build test
+
 package c
 
 import (