internal/mod/zip: skip SizeLimit tests with -race

These tests create very large zip files on purpose,
which is very slow under the race detector due to compress/flate.

The tests and tested API have no concurrency at all,
so the data race detector doesn't add anything useful.
The slowness simply makes our CI's `go test -race ./...` too slow.

Skip the tests when the data race detector is enabled.
Since the upstream Go proposal for runtime/race.Enabled was rejected,
add a similar constant to our internal/cuetest package.

`go test -race ./internal/mod/zip` drops from ~40s to ~1s on my laptop.

Note that we already skip these tests in `go test -short` mode,
but we don't want CI to use `go test -race -short ./...`,
as the data race detector is still useful on other non-short tests.

Signed-off-by: Daniel Martí <mvdan@mvdan.cc>
Change-Id: I44f707c8220af8bb943f5c3e162ef948a78a34c0
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1170024
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Reviewed-by: Roger Peppe <rogpeppe@gmail.com>

internal/cuetest/norace.go

@@ -0,0 +1,19 @@
+// Copyright 2023 The CUE Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build !race
+
+package cuetest
+
+const RaceEnabled = false

internal/cuetest/race.go

@@ -0,0 +1,19 @@
+// Copyright 2023 The CUE Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build race
+
+package cuetest
+
+const RaceEnabled = true

internal/mod/zip/zip_test.go

@@ -20,6 +20,7 @@ import (
 
 	"github.com/google/go-cmp/cmp"
 
+	"cuelang.org/go/internal/cuetest"
 	"cuelang.org/go/internal/mod/module"
 	modzip "cuelang.org/go/internal/mod/zip"
 	"golang.org/x/mod/sumdb/dirhash"
@@ -720,7 +721,7 @@ var sizeLimitTests = [...]sizeLimitTest{
 var sizeLimitVersion = module.MustNewVersion("example.com/large@v1", "v1.0.0")
 
 func TestCreateSizeLimits(t *testing.T) {
-	if testing.Short() {
+	if testing.Short() || cuetest.RaceEnabled {
 		t.Skip("creating large files takes time")
 	}
 	t.Parallel()
@@ -782,7 +783,7 @@ func TestCreateSizeLimits(t *testing.T) {
 }
 
 func TestUnzipSizeLimits(t *testing.T) {
-	if testing.Short() {
+	if testing.Short() || cuetest.RaceEnabled {
 		t.Skip("creating large files takes time")
 	}
 	t.Parallel()
@@ -849,7 +850,7 @@ func TestUnzipSizeLimits(t *testing.T) {
 }
 
 func TestUnzipSizeLimitsSpecial(t *testing.T) {
-	if testing.Short() {
+	if testing.Short() || cuetest.RaceEnabled {
 		t.Skip("skipping test; creating large files takes time")
 	}