diff --git a/tests/plugins/host_agent/test_agent_build_payload.py b/tests/plugins/host_agent/test_agent_build_payload.py
index 2d7f26a..6e03452 100644
--- a/tests/plugins/host_agent/test_agent_build_payload.py
+++ b/tests/plugins/host_agent/test_agent_build_payload.py
@@ -9,14 +9,19 @@ def test_build_sample_shape():
     fake_load = {"1m": 0.1, "5m": 0.2, "15m": 0.3}
     fake_storage = [{"mount": "/", "total_bytes": 1000, "used_bytes": 400}]
 
-    with patch.object(a, "collect_cpu", return_value=12.5), \
+    with patch.object(a, "collect_cpu", return_value=(12.5, [12.0, 13.0])), \
          patch.object(a, "collect_memory", return_value=fake_mem), \
          patch.object(a, "collect_load", return_value=fake_load), \
          patch.object(a, "collect_uptime", return_value=1234), \
-         patch.object(a, "collect_storage", return_value=fake_storage):
-        sample = a.build_sample(mounts=["/"])
+         patch.object(a, "collect_storage", return_value=fake_storage), \
+         patch.object(a, "collect_temps", return_value=[]), \
+         patch.object(a, "collect_psi", return_value={}), \
+         patch.object(a, "collect_net_raw", return_value={}), \
+         patch.object(a, "collect_diskio_raw", return_value={}):
+        sample = a.build_sample(["/"], {})
 
     assert sample["cpu_pct"] == 12.5
+    assert sample["cpu_cores"] == [12.0, 13.0]
     assert sample["mem"]["used_bytes"] == 40
     assert sample["load"]["1m"] == 0.1
     assert sample["uptime_secs"] == 1234
@@ -36,8 +41,12 @@ def test_build_sample_tolerates_collector_failure():
                                                           "available_bytes": 1, "swap_used_bytes": 0}), \
          patch.object(a, "collect_load", return_value={"1m": 0.0, "5m": 0.0, "15m": 0.0}), \
          patch.object(a, "collect_uptime", return_value=0), \
-         patch.object(a, "collect_storage", return_value=[]):
-        sample = a.build_sample(mounts=["/"])
+         patch.object(a, "collect_storage", return_value=[]), \
+         patch.object(a, "collect_temps", return_value=[]), \
+         patch.object(a, "collect_psi", return_value={}), \
+         patch.object(a, "collect_net_raw", return_value={}), \
+         patch.object(a, "collect_diskio_raw", return_value={}):
+        sample = a.build_sample(["/"], {})
     assert sample["cpu_pct"] is None
     assert sample["mem"]["total_bytes"] == 1
 
diff --git a/tests/plugins/host_agent/test_agent_collectors.py b/tests/plugins/host_agent/test_agent_collectors.py
index 9f3d1fa..44aa775 100644
--- a/tests/plugins/host_agent/test_agent_collectors.py
+++ b/tests/plugins/host_agent/test_agent_collectors.py
@@ -56,10 +56,11 @@ def test_collect_cpu_reads_twice():
 
     with patch.object(a, "_read_file", _read), \
          patch.object(a.time, "sleep", lambda _s: None):
-        pct = a.collect_cpu(sample_window=0.0)
+        pct, cores = a.collect_cpu(sample_window=0.0)
     # totals: 1000 → 2000 (delta 1000). idle+iowait: 850 → 1700 (delta 850).
-    # busy = 150. pct = 15.0.
+    # busy = 150. pct = 15.0. No cpuN lines in the fixture → no per-core values.
     assert pct == pytest.approx(15.0, abs=0.1)
+    assert cores == []
 
 
 def test_collect_storage():