From 68870236395435606a767c4c8c1a6b45f5c1ff64 Mon Sep 17 00:00:00 2001
From: Thomas Albers Raviola <thomas@thomaslabs.org>
Date: Tue, 4 Jun 2024 11:08:51 +0200
Subject: Add tests for LU routine

---
 test/test_solvers.py | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

(limited to 'test')

diff --git a/test/test_solvers.py b/test/test_solvers.py
index e5b73d8..5b5da6f 100644
--- a/test/test_solvers.py
+++ b/test/test_solvers.py
@@ -3,8 +3,10 @@
 
 import numpy as np
 from numpy.typing import NDArray
+
 import solvers
 
+
 def test_elimination_3() -> None:
     """Tests elimination with 3 variables."""
     aa = np.array([[2.0, 4.0, 4.0], [5.0, 4.0, 2.0], [1.0, 2.0, -1.0]], dtype=np.float_)
@@ -30,3 +32,26 @@ def test_lindep_3() -> None:
     xx_expected = None
     xx_gauss = solvers.gaussian_eliminate(aa, bb)
     assert xx_expected == xx_gauss
+
+
+def test_lu_factorization() -> None:
+    aa = np.array([[2.0, 4.0, 4.0], [1.0, 2.0, -1.0], [5.0, 4.0, 2.0]])
+    ll, uu, pp = solvers.lu_factorization(aa)
+    assert np.allclose(aa, pp.T @ ll @ uu)
+
+
+def test_forward_substitution() -> None:
+    ll = np.array([[2.0, 0.0, 0.0], [-1.0, 2.0, 0.0], [4.0, 4.0, 2.0]])
+    bb = np.array([3.0, 2.0, 1.0])
+    xx_result = solvers.forward_substitution(ll, bb)[:, 0]
+    xx_expected = np.array([3 / 2, 7.0 / 4.0, -6])
+    print(xx_result)
+    assert np.allclose(xx_expected, xx_result)
+
+def test_back_substitution() -> None:
+    uu = np.array([[2.0, 4.0, 4.0], [0.0, 2.0, -1.0], [0.0, 0.0, 2.0]])
+    bb = np.array([1.0, 2.0, 3.0])
+    xx_result = solvers.back_substitution(uu, bb)[:, 0]
+    xx_expected = np.array([-6, 7.0 / 4.0, 3.0 / 2.0])
+    print(xx_result)
+    assert np.allclose(xx_expected, xx_result)
-- 
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