[#XX] Added Put-Get contracts with test

Tried to implement PutNumber and GetNumber funcs based on contracts in frostfsid_contract.go
Added just one test for now, it's not failing

Signed-off-by: Lebedeva Ekaterina <ekaterina.lebedeva@yadro.com>

FirstContract/contract/contract.go

@@ -1,6 +1,9 @@
 package contract
 
-import "github.com/nspcc-dev/neo-go/pkg/interop/runtime"
+import (
+	"github.com/nspcc-dev/neo-go/pkg/interop/runtime"
+	"github.com/nspcc-dev/neo-go/pkg/interop/storage"
+)
 
 var notificationName string
 
@@ -16,5 +19,16 @@ func RuntimeNotify(args []interface{}) {
 
 // the answer to the “Great Question” of “Life, the Universe and Everything”
 func GetNumber() int {
-	return 42
+	ctx := storage.GetContext()
+	// it := storage.Find(ctx, 123, storage.None)
+	// for iterator.Next(it) {
+	// 	num = iterator.Value(it).(int)
+	// }
+	num := storage.Get(ctx, 123).(int)
+	return num
+}
+
+func PutNumber(num int) {
+	ctx := storage.GetContext()
+	storage.Put(ctx, 123, num)
 }

FirstContract/tests/contract_test.go

@@ -8,6 +8,7 @@ import (
 
 	"github.com/nspcc-dev/neo-go/pkg/neotest"
 	"github.com/nspcc-dev/neo-go/pkg/neotest/chain"
+	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
 )
 
 const ctrPath = "../contract"
@@ -28,3 +29,13 @@ func newExecutor(t *testing.T) *neotest.Executor {
 	bc, acc := chain.NewSingle(t)
 	return neotest.NewExecutor(t, bc, acc, acc)
 }
+
+func TestContract_PutNumber(t *testing.T) {
+	e := newExecutor(t)
+	ctrPutGetNum := neotest.CompileFile(t, e.CommitteeHash, ctrPath, path.Join(ctrPath, "neo-go.yml"))
+	e.DeployContract(t, ctrPutGetNum, nil)
+	inv := e.CommitteeInvoker(ctrPutGetNum.Hash)
+	inv.Invoke(t, stackitem.Null{}, "putNumber", 42)
+
+	inv.Invoke(t, 42, "getNumber")
+}