Fix error on 'Throws error on duplicate index' tests

Author: igonro

src/danfojs-browser/tests/core/generic.test.js

@@ -65,7 +65,7 @@ describe("Generic (NDFrame)", function () {
     });
 
     it("Throws error on duplicate index", function () {
-      let data = [ [ 21, 20, 1 ], [ 20, 25, 3 ] ];
+      let data = [ [ 21, 20, 1 ], [ 20, 25, 3 ], [ 19, 30, 5 ] ];
       assert.throws(
         () => new dfd.NDframe({ data, isSeries: false, index: [ 1, 1, 2 ] }), Error,
         "IndexError: Row index must contain unique values");

src/danfojs-node/test/core/generic.test.ts

@@ -68,7 +68,7 @@ describe("Generic (NDFrame)", function () {
         });
 
         it("Throws error on duplicate index", function () {
-            let data = [[21, 20, 1], [20, 25, 3]];
+            let data = [[21, 20, 1], [20, 25, 3], [19, 30, 5]];
             assert.throws(
                 () => new NDframe({ data, isSeries: false, index: [1, 1, 2] }), Error,
                 "IndexError: Row index must contain unique values");