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dll_tests.js
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(function () {
function assert (condition, message) {
if (condition) {
throw new Error(message);
}
}
function assertEqual (reference, value) {
if (reference !== value) {
throw new Error(reference + ' !== ' + value);
}
}
function assertThrowsError(statement, errorMessage) {
try {
statement();
} catch (error) {
if(error.toString().search(errorMessage) > -1) {
return;
}
else {
throw new Error('Different error should be trown.\nCurrent ' + error);
}
}
}
var unitTests = {
dLinkedListCreationTest: function () {
var dLinkedList = DLinkedList();
assert(dLinkedList.head && dLinkedList._size && dLinkedList.tail, 'dLinkedList was not created');
},
insertLeftTest: function () {
var dLinkedList = DLinkedList();
dLinkedList.insertLeft(5);
assertEqual(dLinkedList.head.data, 5);
assertEqual(dLinkedList.head, dLinkedList.tail);
assertEqual(dLinkedList._size, 1);
dLinkedList.insertLeft(3);
assertEqual(dLinkedList.head.data, 3);
assertEqual(dLinkedList.tail.data, 5);
assertEqual(dLinkedList.head.next.data, dLinkedList.tail.data);
assertEqual(dLinkedList.tail.previous.data, dLinkedList.head.data);
assertEqual(dLinkedList._size, 2);
dLinkedList.insertLeft('string');
assertEqual(dLinkedList.head.data, 'string');
assertEqual(dLinkedList.tail.data, 5);
assertEqual(dLinkedList.head.next.data, 3);
assertEqual(dLinkedList.tail.previous.data, 3);
assertEqual(dLinkedList._size, 3);
},
insertRightTest: function () {
var dLinkedList = DLinkedList();
dLinkedList.insertRight(5);
assertEqual(dLinkedList.head.data, 5);
assertEqual(dLinkedList.tail, dLinkedList.head);
assertEqual(dLinkedList._size, 1);
dLinkedList.insertRight(3);
assertEqual(dLinkedList.head.data, 5);
assertEqual(dLinkedList.tail.data, 3);
assertEqual(dLinkedList.head.next.data, dLinkedList.tail.data);
assertEqual(dLinkedList.tail.previous.data, dLinkedList.head.data);
assertEqual(dLinkedList._size, 2);
dLinkedList.insertRight('string');
assertEqual(dLinkedList.head.data, 5);
assertEqual(dLinkedList.tail.data, 'string');
assertEqual(dLinkedList.head.next.data, 3);
assertEqual(dLinkedList.tail.previous.data, 3);
assertEqual(dLinkedList._size, 3);
},
deleteLeftTest: function () {
var dLinkedList = DLinkedList();
dLinkedList.insertLeft(5);
dLinkedList.deleteLeft();
assertEqual(dLinkedList._size, 0);
assertEqual(dLinkedList.head, null);
assertEqual(dLinkedList.tail, dLinkedList.head);
dLinkedList.insertLeft(3);
dLinkedList.insertLeft(2);
dLinkedList.insertLeft('string');
dLinkedList.deleteLeft();
assertEqual(dLinkedList._size, 2);
assertEqual(dLinkedList.head.data, 2);
assertEqual(dLinkedList.tail.data, 3);
dLinkedList.deleteLeft();
assertEqual(dLinkedList._size, 1);
assertEqual(dLinkedList.head.data, 3);
assertEqual(dLinkedList.head.next, null);
assertEqual(dLinkedList.head.previous, null);
assertEqual(dLinkedList.tail, dLinkedList.head);
dLinkedList.deleteLeft();
assertEqual(dLinkedList._size, 0);
assertEqual(dLinkedList.head, null);
assertEqual(dLinkedList.tail, dLinkedList.head);
},
deleteRightTest: function () {
var dLinkedList = DLinkedList();
dLinkedList.insertLeft(5);
dLinkedList.deleteRight();
assertEqual(dLinkedList._size, 0);
assertEqual(dLinkedList.head, null);
assertEqual(dLinkedList.tail, dLinkedList.head);
dLinkedList.insertLeft('string');
dLinkedList.insertLeft(2);
dLinkedList.insertLeft(4);
dLinkedList.deleteRight();
assertEqual(dLinkedList._size, 2);
assertEqual(dLinkedList.head.data, 4);
assertEqual(dLinkedList.tail.data, 2);
dLinkedList.deleteRight();
assertEqual(dLinkedList._size, 1);
assertEqual(dLinkedList.head.data, 4);
assertEqual(dLinkedList.head.next, null);
assertEqual(dLinkedList.head.previous, null);
assertEqual(dLinkedList.tail, dLinkedList.head);
dLinkedList.deleteRight();
assertEqual(dLinkedList._size, 0);
assertEqual(dLinkedList.head, null);
assertEqual(dLinkedList.tail, dLinkedList.head);
},
seachAtTest: function (position) {
var dLinkedList = new DLinkedList();
for (var i = 0; i < 3; i++) {
dLinkedList.insertRight(i);
assertEqual(dLinkedList.searchAt(i + 1).data, i);
}
},
insertAtTest: function () {
var dLinkedList = DLinkedList();
assertThrowsError(function () {dLinkedList.insertAt(0, 10);},'Position out of bounds');
assertThrowsError(function () {dLinkedList.insertAt(1, 10);},'Position out of bounds');
assertThrowsError(function () {dLinkedList.insertAt(2, 10);},'Position out of bounds');
dLinkedList.insertLeft(5);
dLinkedList.insertAt(1,10);
assertEqual(dLinkedList._size, 2);
assertEqual(dLinkedList.head.data, 10);
assertEqual(dLinkedList.tail.data, 5);
assertThrowsError(function () {dLinkedList.insertAt(3, 20);},'Position out of bounds');
dLinkedList.insertAt(2,20);
assertEqual(dLinkedList._size, 3);
assertEqual(dLinkedList.head.data, 10);
assertEqual(dLinkedList.tail.data, 5);
assertEqual(dLinkedList.head.next.data, 20);
dLinkedList.insertAt(3,8);
assertEqual(dLinkedList._size, 4);
assertEqual(dLinkedList.head.data, 10);
assertEqual(dLinkedList.tail.data, 5);
assertEqual(dLinkedList.tail.previous.data, 8);
},
deleteAtTest: function () {
var dLinkedList = DLinkedList();
assertThrowsError(function () {dLinkedList.deleteAt(0);},'Position out of bounds');
assertThrowsError(function () {dLinkedList.deleteAt(1);},'Position out of bounds');
assertThrowsError(function () {dLinkedList.deleteAt(2);},'Position out of bounds');
for (var i = 0; i < 3; i++) {
dLinkedList.insertRight(i);
}
assertThrowsError(function () {dLinkedList.deleteAt(4);},'Position out of bounds');
dLinkedList.deleteAt(2);
assertEqual(dLinkedList._size, 2);
assertEqual(dLinkedList.head.data, 0);
assertEqual(dLinkedList.tail.data, 2);
assertEqual(dLinkedList.head.next.data, dLinkedList.tail.data);
dLinkedList.deleteAt(2);
assertEqual(dLinkedList._size, 1);
assertEqual(dLinkedList.head.data, 0);
assertEqual(dLinkedList.head.next, null);
assertEqual(dLinkedList.head.previous, null);
assertEqual(dLinkedList.head, dLinkedList.tail);
assertThrowsError(function () {dLinkedList.deleteAt(2);},'Position out of bounds');
dLinkedList.deleteAt(1);
assertEqual(dLinkedList._size, 0);
assertEqual(dLinkedList.head, null);
assertEqual(dLinkedList.tail, dLinkedList.head);
},
deleteNodeTest: function () {
var dLinkedList = DLinkedList();
assertThrowsError(function () {dLinkedList.deleteNode(0);},'The specified node was not found');
for (var i = 0; i < 3; i++) {
dLinkedList.insertRight(i);
}
assertThrowsError(function () {dLinkedList.deleteNode(5);},'The specified node was not found');
dLinkedList.deleteNode(1);
assertEqual(dLinkedList._size, 2);
assertEqual(dLinkedList.head.data, 0);
assertEqual(dLinkedList.tail.data, 2);
assertEqual(dLinkedList.head.next.data, dLinkedList.tail.data);
dLinkedList.deleteNode(2);
assertEqual(dLinkedList._size, 1);
assertEqual(dLinkedList.head.data, 0);
assertEqual(dLinkedList.head.data, dLinkedList.tail.data);
assertThrowsError(function () {dLinkedList.deleteNode(2);},'The specified node was not found');
dLinkedList.deleteNode(0);
assertEqual(dLinkedList._size, 0);
assertEqual(dLinkedList.head, null);
assertEqual(dLinkedList.tail, dLinkedList.head);
},
displayForwardTest: function () {
var dLinkedList = DLinkedList();
for (var i = 0; i < 3; i++) {
dLinkedList.insertRight(i);
}
assertEqual(dLinkedList.displayForward(), '0,1,2')
assertEqual(dLinkedList._size, 3);
},
displayBackwardTest: function () {
var dLinkedList = DLinkedList();
for (var i = 0; i < 3; i++) {
dLinkedList.insertRight(i);
}
assertEqual(dLinkedList.displayBackward(), '2,1,0')
assertEqual(dLinkedList._size, 3);
},
getSizeTest: function () {
var dLinkedList = DLinkedList();
assertEqual(dLinkedList.getSize(), 0);
for (var i = 0; i < 3; i++) {
dLinkedList.insertRight(i);
assertEqual(dLinkedList.getSize(), i + 1);
}
},
clearTest: function () {
var dLinkedList = DLinkedList();
for (var i = 0; i < 3; i++) {
dLinkedList.insertRight(i);
}
dLinkedList.clear();
assertEqual(dLinkedList._size, 0);
assertEqual(dLinkedList.head, null);
assertEqual(dLinkedList.tail, dLinkedList.head);
},
reverseTest: function () {
var dLinkedList = DLinkedList();
for (var i = 0; i < 6; i++) {
dLinkedList.insertRight(i);
}
dLinkedList.reverse();
assertEqual(dLinkedList._size, 6);
assertEqual(dLinkedList.displayForward(), '5,4,3,2,1,0');
dLinkedList.clear();
for (var i = 0; i < 3; i++) {
dLinkedList.insertRight(i);
}
dLinkedList.reverse();
assertEqual(dLinkedList._size, 3);
assertEqual(dLinkedList.displayForward(), '2,1,0');
dLinkedList.clear();
for (var i = 0; i < 2; i++) {
dLinkedList.insertRight(i);
}
dLinkedList.reverse();
assertEqual(dLinkedList._size, 2);
assertEqual(dLinkedList.displayForward(), '1,0');
}
}
var unitTestsMethods = Object.keys(unitTests);
for (var i = 0; i < unitTestsMethods.length; i++) {
try {
unitTests[unitTestsMethods[i]]();
console.log(unitTestsMethods[i] + ' OK');
}
catch (error) {
if (error) {
console.log(unitTestsMethods[i] + ' failed.\n' + error);
}
}
}
} ());