added tests for Backtracking/AllCombinationsOfSizeK

Backtracking/AllCombinationsOfSizeK.js

@@ -38,20 +38,7 @@ class Combinations {
       this.findCombinations(high, total - 1, i + 1)
       this.combinationArray.pop()
     }
-  };
+  }
 }
 
-/*
-  Driver Code
-
-  Test Case 1: n = 3, k = 2
-  Test Case 2: n = 4, k = 2
-*/
-
-console.log('\nFirst Test Case')
-const test1 = new Combinations(3, 2)
-test1.findCombinations()
-
-console.log('\nSecond Test Case')
-const test2 = new Combinations(4, 2)
-test2.findCombinations()
+export { Combinations }

Backtracking/tests/AllCombinationsOfSizeK.test.mjs

@@ -0,0 +1,13 @@
+import { Combinations } from '../AllCombinationsOfSizeK'
+
+describe('AllCombinationsOfSizeK', () => {
+  it('should return 3x2 matrix solution for n = 3 and k = 2', () => {
+    const test1 = new Combinations(3, 2)
+    expect(test1.findCombinations).toEqual([[1, 2], [1, 3], [2, 3]])
+  })
+
+  it('should return 6x2 matrix solution for n = 3 and k = 2', () => {
+    const test2 = new Combinations(4, 2)
+    expect(test2.findCombinations).toEqual([[1, 2], [1, 3], [1, 4], [2, 3], [2, 4], [3, 4]])
+  })
+})