From 1c2ed54b685c688b2289466a8e160bb468b5cc88 Mon Sep 17 00:00:00 2001
From: Mika <kontakt@donau2space.de>
Date: Mon, 16 Mar 2026 13:59:13 +0000
Subject: [PATCH] Add simulation_tool/tests/test_core.py

---
 simulation_tool/tests/test_core.py | 51 ++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 simulation_tool/tests/test_core.py

diff --git a/simulation_tool/tests/test_core.py b/simulation_tool/tests/test_core.py
new file mode 100644
index 0000000..ad87161
--- /dev/null
+++ b/simulation_tool/tests/test_core.py
@@ -0,0 +1,51 @@
+import pytest
+import math
+import numpy as np
+from simulation_tool.core import simulate_scheduling
+from simulation_tool.models import SimulationResults
+
+@pytest.fixture
+def basic_schedule_params():
+    return {"threads": 4, "queue_type": "fifo", "affinity": False}
+
+@pytest.fixture
+def complex_schedule_params():
+    return {"threads": 8, "queue_type": "priority", "affinity": True}
+
+def test_simulate_scheduling_returns_expected_type(basic_schedule_params):
+    result = simulate_scheduling(basic_schedule_params)
+    assert isinstance(result, SimulationResults)
+    assert isinstance(result.time_distributions, list)
+    assert isinstance(result.outlier_occurrences, int)
+
+def test_simulate_scheduling_time_distributions_are_valid(basic_schedule_params):
+    result = simulate_scheduling(basic_schedule_params)
+    assert all(isinstance(v, float) for v in result.time_distributions)
+    assert all(v >= 0.0 for v in result.time_distributions)
+
+def test_simulate_scheduling_outliers_count_coherence(basic_schedule_params):
+    result = simulate_scheduling(basic_schedule_params)
+    mean_val = np.mean(result.time_distributions)
+    std_val = np.std(result.time_distributions)
+    threshold = mean_val + 3 * std_val
+    counted_outliers = sum(1 for v in result.time_distributions if v > threshold)
+    assert abs(counted_outliers - result.outlier_occurrences) <= 2  # tolerate small randomness
+
+def test_simulate_scheduling_with_complex_params(complex_schedule_params):
+    result = simulate_scheduling(complex_schedule_params)
+    assert isinstance(result.time_distributions, list)
+    assert len(result.time_distributions) > 0
+    assert result.outlier_occurrences >= 0
+
+def test_to_json_roundtrip(basic_schedule_params):
+    result = simulate_scheduling(basic_schedule_params)
+    json_obj = result.to_json()
+    assert set(json_obj.keys()) == {"time_distributions", "outlier_occurrences"}
+    assert isinstance(json_obj["time_distributions"], list)
+    assert isinstance(json_obj["outlier_occurrences"], int)
+
+def test_invalid_input_raises_error():
+    with pytest.raises((TypeError, ValueError)):
+        simulate_scheduling(None)
+    with pytest.raises((TypeError, ValueError)):
+        simulate_scheduling({"threads": "NaN"})