Update integration test to support windows

Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>

helpers_unix_test.go

@@ -0,0 +1,51 @@
+// +build !windows
+
+package containerd
+
+import (
+	"context"
+	"fmt"
+
+	specs "github.com/opencontainers/runtime-spec/specs-go"
+)
+
+const newLine = "\n"
+
+func generateSpec(opts ...SpecOpts) (*specs.Spec, error) {
+	return GenerateSpec(opts...)
+}
+
+func withExitStatus(es int) SpecOpts {
+	return func(s *specs.Spec) error {
+		s.Process.Args = []string{"sh", "-c", fmt.Sprintf("exit %d", es)}
+		return nil
+	}
+}
+
+func withProcessArgs(args ...string) SpecOpts {
+	return WithProcessArgs(args...)
+}
+
+func withCat() SpecOpts {
+	return WithProcessArgs("cat")
+}
+
+func withTrue() SpecOpts {
+	return WithProcessArgs("true")
+}
+
+func withExecExitStatus(s *specs.Process, es int) {
+	s.Args = []string{"sh", "-c", fmt.Sprintf("exit %d", es)}
+}
+
+func withExecArgs(s *specs.Process, args ...string) {
+	s.Args = args
+}
+
+func withImageConfig(ctx context.Context, i Image) SpecOpts {
+	return WithImageConfig(ctx, i)
+}
+
+func withNewRootFS(id string, i Image) NewContainerOpts {
+	return WithNewRootFS(id, i)
+}