chore: add tests for examples

examples/libp2p-host/host_test.go

@@ -0,0 +1,14 @@
+package main
+
+import (
+	"testing"
+
+	"github.com/libp2p/go-libp2p/examples/testutils"
+)
+
+func TestMain(t *testing.T) {
+	var h testutils.LogHarness
+	h.ExpectPrefix("Hello World, my hosts ID is ")
+	h.ExpectPrefix("Hello World, my second hosts ID is ")
+	h.Run(t, run)
+}