Substituiton

src/test/java/ch/fhnw/kry/SPNTest.java

@@ -15,4 +15,22 @@ class SPNTest {
         assertEquals(0xFFFF,  spn.k(key, 1));
         assertEquals(0xFFFF,  spn.k(key, 2));
     }
+
+    @Test
+    void substitution() {
+        var spn = new SPN();
+
+        //given
+        int x = 0xEF45;
+        int r = 0x051C;
+        System.out.print(Integer.toHexString(x));
+
+        //when
+        int y = spn.substitution(x);
+
+        // then
+        assertEquals(r, y);
+
+        // System.out.print(Integer.toHexString(spn.substitution(x)));
+    }
 }