fix: Fix Errors After Updates

Signed-off-by: aceppaluni <aceppaluni@gmail.com>

Author: aceppaluni

src/hiero_sdk_python/query/fee_estimate_query.py

@@ -99,7 +99,7 @@ def set_max_attempts(self, attempts: int) -> FeeEstimateQuery:
 
     def set_max_backoff(self, seconds: float) -> FeeEstimateQuery:
         """Set maximum exponential backoff delay."""
-        if not isinstance(seconds, (int, float)):
+        if not isinstance(seconds, (int | float)):
             raise TypeError("seconds must be a number")
 
         if seconds <= 0:

tests/unit/fee_estimate_query_test.py

@@ -263,3 +263,69 @@ def test_topic_message_multiple_chunks(mock_post):
     assert result.service_fee.base == 20 * 2
     assert result.network_fee.subtotal == 1 * 2
     assert result.total == 210 * 2
+
+
+# ---------------------------------------------------------------------
+# Configuration / validation coverage
+# ---------------------------------------------------------------------
+
+
+def test_high_volume_throttle_validation():
+    q = FeeEstimateQuery()
+
+    with pytest.raises(TypeError):
+        q.set_high_volume_throttle("100")
+
+    with pytest.raises(ValueError):
+        q.set_high_volume_throttle(-1)
+
+    with pytest.raises(ValueError):
+        q.set_high_volume_throttle(10001)
+
+    # valid case
+    q.set_high_volume_throttle(5000)
+    assert q.get_high_volume_throttle() == 5000
+
+
+def test_max_attempts_validation():
+    q = FeeEstimateQuery()
+
+    with pytest.raises(TypeError):
+        q.set_max_attempts("3")
+
+    with pytest.raises(ValueError):
+        q.set_max_attempts(0)
+
+    # valid case
+    q.set_max_attempts(2)
+    assert q._max_attempts == 2
+
+
+def test_max_backoff_validation():
+    q = FeeEstimateQuery()
+
+    with pytest.raises(TypeError):
+        q.set_max_backoff("fast")
+
+    with pytest.raises(ValueError):
+        q.set_max_backoff(0)
+
+    # valid case
+    q.set_max_backoff(1.5)
+    assert q._max_backoff == 1.5
+
+
+def test_getters_and_defaults():
+    q = FeeEstimateQuery()
+
+    assert q.get_mode() is None
+    assert q.get_transaction() is None
+    assert q.get_high_volume_throttle() == 0
+
+
+def test_setters_are_chainable():
+    q = FeeEstimateQuery()
+
+    result = q.set_max_attempts(2).set_max_backoff(1.0).set_high_volume_throttle(100)
+
+    assert result is q