[#1] Add simple test for example contract

Tests added: invalid key test, valid key test
and get-without-put test.
neo-go v0.101.3 is a dependency now.

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

tests/contract_test.go

@@ -1 +1,41 @@
 package contract
+
+import (
+	"path"
+	"testing"
+
+	"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 = "../impulse"
+
+// Key for tests
+var (
+	validKey   = []byte{1, 2, 3, 4, 5}
+	invalidKey = []byte{1, 2, 3}
+)
+
+func newExecutor(t *testing.T) *neotest.Executor {
+	bc, acc := chain.NewSingle(t)
+	return neotest.NewExecutor(t, bc, acc, acc)
+}
+
+func TestContract(t *testing.T) {
+	e := newExecutor(t)
+	ctr := neotest.CompileFile(t, e.CommitteeHash, ctrPath, path.Join(ctrPath, "config.yml"))
+	e.DeployContract(t, ctr, nil)
+	inv := e.CommitteeInvoker(ctr.Hash)
+
+	// test get without put
+	inv.InvokeFail(t, "Cannot get number", "getNumber", validKey)
+
+	// test put-get with valid key
+	inv.Invoke(t, stackitem.Null{}, "putNumber", validKey, 42)
+	inv.Invoke(t, 42, "getNumber", validKey)
+
+	// test invalid key
+	inv.InvokeFail(t, "Invalid key size", "putNumber", invalidKey, 42)
+	inv.InvokeFail(t, "Invalid key size", "getNumber", invalidKey)
+}