Wrap testing.MainStart to work around upcoming signature change.

Go1.18 is changing the signature of testing.MainStart. To ensure compatibility,
we wrap MainStart and different implementations for versions before/after
Go1.18.

PiperOrigin-RevId: 401362668

test/runtimes/runner/lib/BUILD

@@ -5,7 +5,11 @@ package(licenses = ["notice"])
 go_library(
     name = "lib",
     testonly = 1,
-    srcs = ["lib.go"],
+    srcs = [
+        "go_test_dependency_go118.go",
+        "go_test_dependency_not_go118.go",
+        "lib.go",
+    ],
     visibility = ["//test/runtimes/runner:__pkg__"],
     deps = [
         "//pkg/log",

test/runtimes/runner/lib/go_test_dependency_go118.go

@@ -0,0 +1,27 @@
+// Copyright 2021 The gVisor 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 go1.18 && go1.1
+// +build go1.18,go1.1
+
+package lib
+
+import (
+	"testing"
+)
+
+// mainStart wraps testing.MainStart for Go release == 1.18.
+func mainStart(tests []testing.InternalTest) *testing.M {
+	return testing.MainStart(testDeps{}, tests, nil, nil, nil)
+}

test/runtimes/runner/lib/go_test_dependency_not_go118.go

@@ -0,0 +1,25 @@
+// Copyright 2021 The gVisor 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 !go1.18 && go1.1
+// +build !go1.18,go1.1
+
+package lib
+
+import "testing"
+
+// mainStart wraps testing.MainStart for Go release < 1.18.
+func mainStart(tests []testing.InternalTest) *testing.M {
+	return testing.MainStart(testDeps{}, tests, nil, nil)
+}

test/runtimes/runner/lib/lib.go

@@ -21,6 +21,7 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"reflect"
 	"sort"
 	"strings"
 	"testing"
@@ -63,8 +64,7 @@ func RunTests(lang, image, excludeFile string, batchSize int, timeout time.Durat
 		fmt.Fprintf(os.Stderr, "%s\n", err.Error())
 		return 1
 	}
-
+	m := mainStart(tests)
-	m := testing.MainStart(testDeps{}, tests, nil, nil)
 	return m.Run()
 }
 
@@ -197,3 +197,21 @@ func (f testDeps) ImportPath() string                          { return "" }
 func (f testDeps) StartTestLog(io.Writer)                      {}
 func (f testDeps) StopTestLog() error                          { return nil }
 func (f testDeps) SetPanicOnExit0(bool)                        {}
+func (f testDeps) CoordinateFuzzing(time.Duration, int64, time.Duration, int64, int, []corpusEntry, []reflect.Type, string, string) error {
+	return nil
+}
+func (f testDeps) RunFuzzWorker(func(corpusEntry) error) error              { return nil }
+func (f testDeps) ReadCorpus(string, []reflect.Type) ([]corpusEntry, error) { return nil, nil }
+func (f testDeps) CheckCorpus([]interface{}, []reflect.Type) error          { return nil }
+func (f testDeps) ResetCoverage()                                           {}
+func (f testDeps) SnapshotCoverage()                                        {}
+
+// Copied from testing/fuzz.go.
+type corpusEntry = struct {
+	Parent     string
+	Name       string
+	Data       []byte
+	Values     []interface{}
+	Generation int
+	IsSeed     bool
+}