add test

Author: NoureldinYosri

test/test_value_array.py

@@ -263,3 +263,8 @@ class _InvalidUnit:
 def test_invalid_unit_raises_error() -> None:
     with pytest.raises(ValueError):
         _ = tu.ValueArray([1, 2], _InvalidUnit())
+
+
+def test_format():
+    u = tu.GHz * np.random.random(10)
+    assert f'{u=}' == str(u)