Paketstruktur + rot_3D

test/test_matrixmania/test_rot.py

@@ -0,0 +1,53 @@
+import math
+
+import pytest
+
+from matrixmania.compute import matmul, rot_2D, rot_3D
+
+
+def assert_matrix(actual: list[list[float]], expected: list[list[float]]) -> None:
+    """Compares two matrices element‑wise with a float tolerance."""
+    assert len(actual) == len(expected)
+    for actual_row, expected_row in zip(actual, expected, strict=True):
+        assert actual_row == pytest.approx(expected_row)
+
+
+def test_rot_2D_identity() -> None:
+    assert_matrix(rot_2D(0.0), [[1.0, 0.0], [0.0, 1.0]])
+
+
+def test_rot_3D_x_90_degrees() -> None:
+    matrix = rot_3D(math.pi / 2, "x")
+    assert_matrix(matrix, [[1.0, 0.0, 0.0], [0.0, 0.0, -1.0], [0.0, 1.0, 0.0]])
+
+
+def test_rot_3D_y_90_degrees() -> None:
+    matrix = rot_3D(math.pi / 2, "y")
+    assert_matrix(matrix, [[0.0, 0.0, 1.0], [0.0, 1.0, 0.0], [-1.0, 0.0, 0.0]])
+
+
+def test_rot_3D_z_90_degrees() -> None:
+    matrix = rot_3D(math.pi / 2, "z")
+    assert_matrix(matrix, [[0.0, -1.0, 0.0], [1.0, 0.0, 0.0], [0.0, 0.0, 1.0]])
+
+
+def test_rot_3D_zero_angle_is_identity() -> None:
+    identity = [[1.0, 0.0, 0.0], [0.0, 1.0, 0.0], [0.0, 0.0, 1.0]]
+    for axis in ("x", "y", "z"):
+        assert_matrix(rot_3D(0.0, axis), identity)
+
+
+def test_rot_3D_rotates_vector() -> None:
+    rotated = matmul(rot_3D(math.pi / 2, "z"), [[1.0], [0.0], [0.0]])
+    assert_matrix(rotated, [[0.0], [1.0], [0.0]])
+
+
+def test_rot_3D_invalid_axis() -> None:
+    for axis in ("w", "", "X", 1, None):
+        with pytest.raises(ValueError):
+            rot_3D(1.0, axis)
+
+
+def test_rot_3D_invalid_angle() -> None:
+    with pytest.raises(ValueError):
+        rot_3D("not a number", "z")