Add failing case to EigenvalueTest

This is the same U matrix added to the Eigenvector test. Except the power method actually calculates the correct maximum eigenvalue of the U matrix.

Author: Aweptimum

tests/LinearAlgebra/Eigen/EigenvalueTest.php

@@ -251,6 +251,19 @@ public function dataProviderForLargeMatrixEigenvalues(): array
                 ],
                 [4, 3, 2, -2, 1, -1],
                 4,
+            ],
+            
+            [ // Failing case
+                [
+                    [2,0,0,0,0,0],
+                    [0,2,0,0,0,1729.7],
+                    [0,0,2,0,-1729.7,0],
+                    [0,0,0,0,0,0],
+                    [0,0,-1729.7,0,2.82879*10**6,0],
+                    [0,1729.7,0,0,0,2.82879*10**6]
+                ],
+                [2828791.05765, 0.94235235527, 0.94235235527, 2828791.05765, 2, 0],
+                2828791.05765
             ]
         ];
     }