Fix other problem with diagonal test.

Author: mcordingley

tests/MatrixTest.php

@@ -236,11 +236,11 @@ public function testDiagonal() {
 
         $diagonal = $matrix->diagonal();
 
-        $this->assertEquals(1, $matrix->rows);
-        $this->assertEquals(3, $matrix->columns);
-        $this->assertEquals(1, $matix->get(0, 0));
-        $this->assertEquals(5, $matix->get(0, 1));
-        $this->assertEquals(9, $matix->get(0, 2));
+        $this->assertEquals(1, $diagonal->rows);
+        $this->assertEquals(3, $diagonal->columns);
+        $this->assertEquals(1, $diagonal->get(0, 0));
+        $this->assertEquals(5, $diagonal->get(0, 1));
+        $this->assertEquals(9, $diagonal->get(0, 2));
     }
 
     public function testTrace() {