test: to_align_offset behaves as expected

tests/test_align.py

@@ -0,0 +1,79 @@
+import pytest
+
+from build123d.build_enums import Align
+from build123d.geometry import Vector, to_align_offset
+
+
+@pytest.mark.parametrize(
+    "x_align,x_expect",
+    [
+        (Align.MAX, -0.5),
+        (Align.CENTER, 0.25),
+        (Align.MIN, 1),
+        (Align.NONE, 0),
+    ],
+)
+@pytest.mark.parametrize(
+    "y_align,y_expect",
+    [
+        (Align.MAX, -1),
+        (Align.CENTER, 0.25),
+        (Align.MIN, 1.5),
+        (Align.NONE, 0),
+    ],
+)
+@pytest.mark.parametrize(
+    "z_align,z_expect",
+    [
+        (Align.MAX, -1),
+        (Align.CENTER, -0.75),
+        (Align.MIN, -0.5),
+        (Align.NONE, 0),
+    ],
+)
+def test_align(
+    x_align,
+    x_expect,
+    y_align,
+    y_expect,
+    z_align,
+    z_expect,
+):
+    offset = to_align_offset(
+        min_point=(-1, -1.5, 0.5),
+        max_point=(0.5, 1.0, 1.0),
+        align=(x_align, y_align, z_align),
+    )
+    assert offset.X == x_expect
+    assert offset.Y == y_expect
+    assert offset.Z == z_expect
+
+
+@pytest.mark.parametrize("alignment", Align)
+def test_align_single(alignment):
+    min_point = (-1, -1.5, 0.5)
+    max_point = (0.5, 1, 1)
+    expected = to_align_offset(
+        min_point=min_point,
+        max_point=max_point,
+        align=(alignment, alignment, alignment),
+    )
+    offset = to_align_offset(
+        min_point=min_point,
+        max_point=max_point,
+        align=alignment,
+    )
+    assert expected == offset
+
+
+def test_align_center():
+    min_point = (-1, -1.5, 0.5)
+    max_point = (0.5, 1, 1)
+    center = (4, 2, 6)
+    offset = to_align_offset(
+        min_point=min_point,
+        max_point=max_point,
+        center=center,
+        align=Align.CENTER,
+    )
+    assert offset == -Vector(center)