sixth commit: test added

test/test_matrixmania/test_project_perspective.py

@@ -0,0 +1,48 @@
+import math
+import pytest
+
+from matrixmania import project_perspective
+
+
+def approx_equal(a: float, b: float, rel_tol: float = 1e-9) -> bool:
+    """Utility to compare two floats with a relative tolerance."""
+    return math.isclose(a, b, rel_tol=rel_tol)
+
+
+@pytest.mark.parametrize(
+    "point,focal_length,scale,expected",
+    [
+        # Case 1 – no scaling, unit focal length
+        (
+            (1.0, 2.0, 3.0),
+            1.0,  # focal_length
+            1.0,  # scale
+            (
+                1.0 / (4.0 + 3.0),  # x projected
+                2.0 / (4.0 + 3.0),  # y projected
+            ),
+        ),
+        # Case 2 – scale 100, focal length 2
+        (
+            (1.0, 2.0, 3.0),
+            2.0,  # focal_length
+            100.0,  # scale
+            (
+                2.0 * 100.0 / (4.0 + 3.0),  # x projected
+                2.0 * 100.0 * 2.0 / (4.0 + 3.0),  # y projected
+            ),
+        ),
+    ],
+)
+def test_project_perspective(point, focal_length, scale, expected):
+    """Test that project_perspective returns the correct 2‑D projection."""
+    # Call the function under test
+    result = project_perspective(point, focal_length=focal_length, scale=scale)
+
+    # Basic sanity checks
+    assert isinstance(result, tuple), "Result should be a tuple"
+    assert len(result) == 2, "Result should contain two coordinates"
+
+    # Confirm values are close to expected (within tiny tolerance)
+    assert approx_equal(result[0], expected[0]), f"X coordinate mismatch: {result[0]} != {expected[0]}"
+    assert approx_equal(result[1], expected[1]), f"Y coordinate mismatch: {result[1]} != {expected[1]}"