cli: add test for testinvokefunction

Check that contract can be properly deployed
and invoked.

cli/testdata/deploy/main.go

@@ -0,0 +1,31 @@
+package deploy
+
+import (
+	"github.com/nspcc-dev/neo-go/cli/testdata/deploy/sub"
+	"github.com/nspcc-dev/neo-go/pkg/interop/contract"
+	"github.com/nspcc-dev/neo-go/pkg/interop/storage"
+)
+
+var key = "key"
+
+func _deploy(isUpdate bool) {
+	ctx := storage.GetContext()
+	value := "on create"
+	if isUpdate {
+		value = "on update"
+	}
+	storage.Put(ctx, key, value)
+}
+
+// Update updates contract with the new one.
+func Update(script, manifest []byte) {
+	contract.Update(script, manifest)
+}
+
+// GetValue returns stored value.
+func GetValue() string {
+	ctx := storage.GetReadOnlyContext()
+	val1 := storage.Get(ctx, key)
+	val2 := storage.Get(ctx, sub.Key)
+	return val1.(string) + "|" + val2.(string)
+}