diff --git a/mytest/byron/classes/value_bag-test.py b/mytest/byron/classes/value_bag-test.py
new file mode 100644
index 0000000..2707c28
--- /dev/null
+++ b/mytest/byron/classes/value_bag-test.py
@@ -0,0 +1,68 @@
+import pytest
+from byron.classes.value_bag import ValueBag
+
+def test_valuebag_init():
+    vb = ValueBag()
+    assert isinstance(vb, ValueBag)
+
+def test_valuebag_read_only():
+    vb = ValueBag()
+    with pytest.raises(NotImplementedError):
+        vb['key'] = 'value'
+
+    with pytest.raises(NotImplementedError):
+        del vb['key']
+
+def test_valuebag_missing():
+    vb = ValueBag()
+    assert vb.__missing__("$flag") is False
+    assert vb.__missing__("normal_key") is None
+
+
+def test_valuebag_safe_keys():
+    vb = ValueBag({"safe_key": "value", "_private": "hidden"})
+    assert "safe_key" in vb.keys()
+    assert "_private" in vb.keys()  # Assuming underscore is allowed at the start based on SAFE_KEY regex
+
+
+def test_valuebag_attr_access():
+    vb = ValueBag({"safe_key": "value"})
+    assert vb.safe_key == "value"
+
+def test_valuebag_or_ior():
+    vb1 = ValueBag({"key1": "value1"})
+    vb2 = ValueBag({"key2": "value2"})
+    vb3 = vb1 | vb2
+    assert "key1" in vb3 and "key2" in vb3
+    vb1 |= vb2
+    assert "key2" in vb1
+
+
+def test_valuebag_getattr_invalid():
+    vb = ValueBag()
+    assert vb.invalid_key is None  # Expect None for invalid keys
+
+
+def test_valuebag_flag_keys():
+    vb = ValueBag()  # Create an empty ValueBag
+    assert vb["$missing_flag"] is False  # Flag keys should return False when missing
+
+
+def test_valuebag_update_or():
+    vb1 = ValueBag({"key1": "value1"})
+    vb2 = {"key2": "value2"}
+    vb1 |= vb2
+    assert "key2" in vb1  # Ensure __ior__ works with regular dicts
+#todo add __hash__(self) in the value_bag
+def test_valuebag_hashable():
+    vb = ValueBag({"key": "value"})
+    assert isinstance(hash(vb), int), "ValueBag should be hashable"
+
+def test_valuebag_repr():
+    vb = ValueBag({"key": "value"})
+    assert isinstance(repr(vb), str)  # Ensure __repr__ returns a string
+
+def test_valuebag_iter():
+    vb = ValueBag({"key1": "value1", "key2": "value2"})
+    keys = [k for k in vb]  # Iterating over ValueBag
+    assert "key1" in keys and "key2" in keys  # Check keys are in the iterator