logictest: add test for mixed-version configs

This commit adds a test that verifies that for each supported previous
release we have a logictest config that bootstraps the cluster at that
version.

Informs: #112629
Release note: None

pkg/BUILD.bazel

@@ -447,6 +447,7 @@ ALL_TESTS = [
     "//pkg/sql/lex:lex_disallowed_imports_test",
     "//pkg/sql/lex:lex_test",
     "//pkg/sql/lexbase:lexbase_test",
+    "//pkg/sql/logictest/logictestbase:logictestbase_test",
     "//pkg/sql/logictest/tests/5node-disk:5node-disk_test",
     "//pkg/sql/logictest/tests/5node:5node_test",
     "//pkg/sql/logictest/tests/cockroach-go-testserver-upgrade-to-master:cockroach-go-testserver-upgrade-to-master_test",
@@ -1851,6 +1852,7 @@ GO_TARGETS = [
     "//pkg/sql/lexbase:lexbase",
     "//pkg/sql/lexbase:lexbase_test",
     "//pkg/sql/logictest/logictestbase:logictestbase",
+    "//pkg/sql/logictest/logictestbase:logictestbase_test",
     "//pkg/sql/logictest/tests/5node-disk:5node-disk_test",
     "//pkg/sql/logictest/tests/5node:5node_test",
     "//pkg/sql/logictest/tests/cockroach-go-testserver-upgrade-to-master:cockroach-go-testserver-upgrade-to-master_test",

pkg/sql/logictest/logictestbase/BUILD.bazel

@@ -1,4 +1,4 @@
-load("@io_bazel_rules_go//go:def.bzl", "go_library")
+load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
 
 go_library(
     name = "logictestbase",
@@ -12,3 +12,10 @@ go_library(
         "//pkg/roachpb",
     ],
 )
+
+go_test(
+    name = "logictestbase_test",
+    srcs = ["logictestbase_test.go"],
+    embed = [":logictestbase"],
+    deps = ["//pkg/clusterversion"],
+)

pkg/sql/logictest/logictestbase/logictestbase_test.go

@@ -0,0 +1,31 @@
+// Copyright 2023 The Cockroach Authors.
+//
+// Use of this software is governed by the Business Source License
+// included in the file licenses/BSL.txt.
+//
+// As of the Change Date specified in that file, in accordance with
+// the Business Source License, use of this software will be governed
+// by the Apache License, Version 2.0, included in the file
+// licenses/APL.txt.
+
+package logictestbase
+
+import (
+	"testing"
+
+	"github.com/cockroachdb/cockroach/pkg/clusterversion"
+)
+
+func TestLogicTestMixedVersionConfigs(t *testing.T) {
+	// Verify there is a mixed-version config for each supported release.
+	for _, v := range clusterversion.SupportedPreviousReleases() {
+		t.Run(v.String(), func(t *testing.T) {
+			for _, c := range LogicTestConfigs {
+				if c.DisableUpgrade && c.BootstrapVersion == v {
+					return
+				}
+			}
+			t.Errorf("no mixed-version config for %v", v)
+		})
+	}
+}