🧪 AddTwoNumbers test cases with failing solution

Sources/LeetSwiftCore/Solutions/002 - Add Two Numbers/AddTwoNumbersSolution.swift

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+//
+//  AddTwoNumbersSolution.swift
+//  
+//
+//  Created by Jobert Sá on 02/07/2024.
+//
+
+import Foundation
+
+class AddTwoNumbersSolution: AddTwoNumbersDefinition {
+    func addTwoNumbers(_ l1: ListNode?, _ l2: ListNode?) -> ListNode? {
+        nil
+    }
+}

Tests/LeetSwiftCoreTests/Problems/002 - Add Two Numbers/AddTwoNumbersTests.swift

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+//
+//  AddTwoNumbersTests.swift
+//  
+//
+//  Created by Jobert Sá on 02/07/2024.
+//
+
+import XCTest
+@testable import LeetSwiftCore
+
+final class AddTwoNumbersTests: XCTestCase {
+
+    let solution: AddTwoNumbersDefinition = AddTwoNumbersSolution()
+
+    func testSolution() {
+        for testData in data {
+            let input = testData.input
+
+            let output = solution.addTwoNumbers(input.l1, input.l2)
+
+            XCTAssertEqual(output, testData.expectedOutput)
+        }
+    }
+}
+
+extension AddTwoNumbersTests: TestCaseProviding {
+    func validateInput(_ input: (l1: ListNode?, l2: ListNode?)) -> Bool {
+        // TODO: Implement validation
+        true
+    }
+
+    var data: [TestData<(l1: ListNode?, l2: ListNode?), ListNode?>] { [
+        TestData(
+            input: ([2, 4, 3].listNode, [5, 6, 4].listNode),
+            expectedOutput: [7, 0, 8].listNode
+        ),
+        TestData(
+            input: ([0].listNode, [0].listNode),
+            expectedOutput: [0].listNode
+        ),
+        TestData(
+            input: ([9, 9, 9, 9, 9, 9, 9].listNode, [9, 9, 9, 9].listNode),
+            expectedOutput: [8, 9, 9, 9, 0, 0, 0, 1].listNode
+        )
+    ] }
+}
+
+private extension Array where Element == Int {
+    var listNode: ListNode? {
+        guard let first else { return nil }
+        let l = ListNode(first)
+        for i in 1..<count {
+            l.next = ListNode(self[i])
+        }
+        return l
+    }
+}