changed ModelTest.java the toString test. Comparing of returned string with an static string

src/test/java/ModelTest.java

@@ -9,6 +9,7 @@ public class ModelTest extends MainFrame {
 
     @Test
     public void test_toString() {
+
         GameField gameField = new GameField(360);
 
         for (int i = 0; i < 9; i++) {
@@ -19,7 +20,23 @@ public class ModelTest extends MainFrame {
 
         Model model = new Model(gameField);
 
-        System.out.println(model);
+        String staticCase =
+                "X    0 1 2   3 4 5   6 7 8\n" +
+                "  ------------------------\n" +
+                "0 |  0 0 0   0 0 0   0 0 0\n" +
+                "1 |  1 1 1   1 1 1   1 1 1\n" +
+                "2 |  2 2 2   2 2 2   2 2 2\n" +
+                "  |\n" +
+                "3 |  3 3 3   3 3 3   3 3 3\n" +
+                "4 |  4 4 4   4 4 4   4 4 4\n" +
+                "5 |  5 5 5   5 5 5   5 5 5\n" +
+                "  |\n" +
+                "6 |  6 6 6   6 6 6   6 6 6\n" +
+                "7 |  7 7 7   7 7 7   7 7 7\n" +
+                "8 |  8 8 8   8 8 8   8 8 8\n";
+
+
+        assertEquals(model.toString(), staticCase, "tested Overridden toString of Model.class");
     }
 
     @Test
@@ -115,7 +132,7 @@ public class ModelTest extends MainFrame {
             }
         }
 
-        assertTrue(a);
+        assertTrue(a, "arrangement of set values of parsing from GameField");
     }
 
     @Test