diff --git a/tests/test_failure_policy.py b/tests/test_failure_policy.py
index 2437a78..b77785f 100644
--- a/tests/test_failure_policy.py
+++ b/tests/test_failure_policy.py
@@ -1,12 +1,8 @@
-import pytest
 from unittest.mock import patch
 
-from ngraph.failure_policy import (
-    FailurePolicy,
-    FailureRule,
-    FailureCondition,
-    _evaluate_condition,
-)
+import pytest
+
+from ngraph.failure_policy import FailureCondition, FailurePolicy, FailureRule
 
 
 def test_node_scope_all():
@@ -285,3 +281,23 @@ def test_cache_disabled():
     nodes["N1"]["capacity"] = 10
     second_fail = policy.apply_failures(nodes, links)
     assert set(second_fail) == set()
+
+
+def test_evaluate_conditions_invalid_logic():
+    """_evaluate_conditions should raise for unsupported logic values."""
+    attrs = {"cap": 50}
+    conds = [FailureCondition(attr="cap", operator=">=", value=10)]
+    with pytest.raises(ValueError, match="Unsupported logic"):
+        FailurePolicy._evaluate_conditions(attrs, conds, "xor")
+
+
+def test_select_entities_invalid_rule_type():
+    """_select_entities should raise for unsupported rule_type."""
+    dummy_rule = FailureRule(
+        entity_scope="node",
+        conditions=[],
+        logic="any",
+        rule_type="bogus",
+    )
+    with pytest.raises(ValueError, match="Unsupported rule_type"):
+        FailurePolicy._select_entities({"A", "B"}, dummy_rule)
diff --git a/tests/test_traffic_manager.py b/tests/test_traffic_manager.py
index d742087..c501391 100644
--- a/tests/test_traffic_manager.py
+++ b/tests/test_traffic_manager.py
@@ -1,12 +1,9 @@
 import pytest
 
-from ngraph.network import Network, Node, Link
-from ngraph.traffic_demand import TrafficDemand
 from ngraph.lib.flow_policy import FlowPolicyConfig
 from ngraph.lib.graph import StrictMultiDiGraph
-from ngraph.lib.algorithms.base import MIN_FLOW
-from ngraph.lib.demand import Demand
-
+from ngraph.network import Link, Network, Node
+from ngraph.traffic_demand import TrafficDemand
 from ngraph.traffic_manager import TrafficManager
 
 
@@ -411,3 +408,34 @@ def test_estimate_rounds_no_capacities():
     total_placed = tm.place_all_demands(placement_rounds="auto")
     # The link has 0 capacity, so no actual flow can be placed.
     assert total_placed == 0.0, "No capacity => no flow placed"
+
+
+def test_get_traffic_results_aggregated_and_detailed(small_network):
+    """TrafficManager.get_traffic_results should summarize correctly."""
+    demands = [
+        TrafficDemand(source_path="A", sink_path="C", demand=10.0),
+        TrafficDemand(source_path="B", sink_path="C", demand=5.0),
+    ]
+    tm = TrafficManager(network=small_network, traffic_demands=demands)
+    tm.build_graph()
+    tm.expand_demands()
+    tm.place_all_demands()
+
+    agg = tm.get_traffic_results(detailed=False)
+    assert len(agg) == 2
+    for res in agg:
+        assert res.total_volume == res.placed_volume
+
+    detailed = tm.get_traffic_results(detailed=True)
+    assert len(detailed) == len(tm.demands)
+    for res in detailed:
+        assert res.total_volume == res.placed_volume
+
+
+def test_estimate_rounds_typical_case(small_network):
+    """_estimate_rounds should compute rounds based on demand/capacity ratio."""
+    demands = [TrafficDemand(source_path="A", sink_path="C", demand=20.0)]
+    tm = TrafficManager(network=small_network, traffic_demands=demands)
+    tm.build_graph()
+    tm.expand_demands()
+    assert tm._estimate_rounds() == 6
diff --git a/tests/workflow/test_capacity_probe.py b/tests/workflow/test_capacity_probe.py
index 663eafd..d606871 100644
--- a/tests/workflow/test_capacity_probe.py
+++ b/tests/workflow/test_capacity_probe.py
@@ -1,9 +1,10 @@
+from unittest.mock import MagicMock
+
 import pytest
-from unittest.mock import MagicMock, call
 
-from ngraph.network import Network, Node, Link
-from ngraph.workflow.capacity_probe import CapacityProbe
 from ngraph.lib.algorithms.base import FlowPlacement
+from ngraph.network import Link, Network, Node
+from ngraph.workflow.capacity_probe import CapacityProbe
 
 
 @pytest.fixture
@@ -244,3 +245,9 @@ def test_capacity_probe_probe_reverse(mock_scenario):
     assert "max_flow:[B -> A]" in flows
     assert flows["max_flow:[A -> B]"] == 3.0
     assert flows["max_flow:[B -> A]"] == 3.0
+
+
+def test_capacity_probe_invalid_flow_placement():
+    """Invalid flow_placement string should raise ValueError."""
+    with pytest.raises(ValueError, match="Invalid flow_placement"):
+        CapacityProbe(name="Bad", flow_placement="bogus")