feat: Create a module for Mythic RPG’s Fate Chart

tests/test_fate_chart.py

@@ -0,0 +1,51 @@
+# SPDX-FileCopyrightText: 2025 2025
+# SPDX-FileContributor: Gergely Polonkai
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+"""Tests for the Fate Chart module"""
+
+import pytest
+from pytest_mock import MockerFixture
+
+from gm_assistant.fate_chart import FateOdds, FateOutcome, decide
+
+
+@pytest.mark.parametrize("odds", FateOdds)
+@pytest.mark.parametrize("chaos_level", range(9))
+def test_all_valid_values(odds: FateOdds, chaos_level: int) -> None:
+    """Test if every valid value yields some result"""
+
+    assert isinstance(decide(odds, chaos_level=chaos_level), FateOutcome)
+
+
+# WARNING
+#
+# Tests below this line rely on exact values in the fate_chart module
+
+
+def test_exceptional_yes(mocker: MockerFixture) -> None:
+    """Test if exceptional yes result is returned"""
+
+    mocker.patch("gm_assistant.fate_chart.Die.roll", return_value=10)
+    assert decide(FateOdds.FIFTY_FIFTY, chaos_level=5) == FateOutcome.EXC_YES
+
+
+def test_yes(mocker: MockerFixture) -> None:
+    """Test if yes result is returned"""
+
+    mocker.patch("gm_assistant.fate_chart.Die.roll", return_value=50)
+    assert decide(FateOdds.FIFTY_FIFTY, chaos_level=5) == FateOutcome.YES
+
+
+def test_exceptional_no(mocker: MockerFixture) -> None:
+    """Test if exceptional no result is returned"""
+
+    mocker.patch("gm_assistant.fate_chart.Die.roll", return_value=91)
+    assert decide(FateOdds.FIFTY_FIFTY, chaos_level=5) == FateOutcome.EXC_NO
+
+
+def test_no(mocker: MockerFixture) -> None:
+    """Test if exceptional no result is returned"""
+
+    mocker.patch("gm_assistant.fate_chart.Die.roll", return_value=51)
+    assert decide(FateOdds.FIFTY_FIFTY, chaos_level=5) == FateOutcome.NO