KnightTour : convert live code example to Jest test (log remaining is within a print method).

Backtracking/KnightTour.js

@@ -64,15 +64,4 @@ class OpenKnightTour {
   }
 }
 
-function main () {
+export { OpenKnightTour }
-  const board = new OpenKnightTour(5)
-
-  board.printBoard()
-  console.log('\n')
-
-  board.solve()
-
-  board.printBoard()
-}
-
-main()

Backtracking/tests/KnightTour.test.js

@@ -0,0 +1,24 @@
+import { OpenKnightTour } from '../KnightTour'
+
+describe('OpenKnightTour', () => {
+  it('OpenKnightTour(5)', () => {
+    const KT = new OpenKnightTour(5)
+    expect(KT.board).toEqual([
+      [ 0, 0, 0, 0, 0 ],
+      [ 0, 0, 0, 0, 0 ],
+      [ 0, 0, 0, 0, 0 ],
+      [ 0, 0, 0, 0, 0 ],
+      [ 0, 0, 0, 0, 0 ]
+    ])
+
+    KT.solve()
+    expect(KT.board).toEqual([
+      [ 19, 4, 15, 10, 25 ],
+      [ 14, 9, 18, 5, 16 ],
+      [ 1, 20, 3, 24, 11 ],
+      [ 8, 13, 22, 17, 6 ],
+      [ 21, 2, 7, 12, 23 ]
+    ])
+  })
+
+})