Add backends and simulated TPM device

Signed-off-by: Ettore Di Giacinto <edigiacinto@suse.com>

backend/socket_test.go

@@ -0,0 +1,29 @@
+package backend_test
+
+import (
+	"os"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+	. "github.com/rancher-sandbox/go-tpm/backend"
+)
+
+var _ = Describe("SWTPM", func() {
+	socket := os.Getenv("SWTPM_SOCKET")
+	Context("opening socket connection", func() {
+		It("fails on invalid files", func() {
+
+			_, err := Socket("foobar")
+			Expect(err).To(HaveOccurred())
+
+		})
+
+		It("dials in just fine", func() {
+			if socket == "" {
+				Skip("No socket file specified")
+			}
+			_, err := Socket(socket)
+			Expect(err).ToNot(HaveOccurred())
+		})
+	})
+})