[#XX] Added 'Get before Put' test

Also changed GetNumber() to check on nil interface

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

FirstContract/contract/contract.go

@@ -19,13 +19,18 @@ func RuntimeNotify(args []interface{}) {
 
 // the answer to the “Great Question” of “Life, the Universe and Everything”
 func GetNumber() int {
+
+	// var num int
 	ctx := storage.GetContext()
-	// it := storage.Find(ctx, 123, storage.None)
+	// it := storage.Find(ctx, 123, storage.ValuesOnly)
 	// for iterator.Next(it) {
 	// 	num = iterator.Value(it).(int)
 	// }
-	num := storage.Get(ctx, 123).(int)
-	return num
+	num := storage.Get(ctx, 123)
+	if num == nil {
+		panic("Cannot get number")
+	}
+	return num.(int)
 }
 
 func PutNumber(num int) {

FirstContract/tests/contract_test.go

@@ -1,8 +1,6 @@
 package tests
 
 import (
-	"FirstContract/contract"
-	"fmt"
 	"path"
 	"testing"
 
@@ -14,15 +12,11 @@ import (
 const ctrPath = "../contract"
 
 func TestContract_GetNumber(t *testing.T) {
-	fmt.Println(contract.GetNumber())
-
 	e := newExecutor(t)
 	ctrGetNum := neotest.CompileFile(t, e.CommitteeHash, ctrPath, path.Join(ctrPath, "neo-go.yml"))
 	e.DeployContract(t, ctrGetNum, nil)
 	inv := e.CommitteeInvoker(ctrGetNum.Hash)
-	//acc := inv.NewAccount(t)
-	inv.Invoke(t, 42, "getNumber")
-
+	inv.InvokeFail(t, "Cannot get number", "getNumber")
 }
 
 func newExecutor(t *testing.T) *neotest.Executor {