add tests and cleanup code

Author: spaenleh

Sources/Day11.swift

@@ -3,7 +3,7 @@ import Algorithms
 struct Day11: AdventDay {
   var data: String
 
-  func getStones(data: String) -> [Int: Int] {
+  static func getStones(data: String) -> [Int: Int] {
     var stones = [Int: Int]()
     data.trimmed().integers().forEach { stone in
       stones[stone, default: 0] += 1
@@ -12,7 +12,7 @@ struct Day11: AdventDay {
   }
 
   func stoneMe(blinks: Int) -> Int {
-    var stones = getStones(data: data)
+    var stones = Self.getStones(data: data)
     for _ in 0..<blinks {
       var newStones = [Int: Int]()
       for (stone, count) in stones {

Tests/Day11.swift

@@ -5,12 +5,19 @@ import Testing
 @Suite("Day11")
 struct Day11Tests {
 
+  let testData = """
+    125 17
+    """
+
+  @Test("Get stones")
+  func testGetStones() async throws {
+    #expect(Day11.getStones(data: testData) == [125: 1, 17: 1])
+  }
+
   @Test("part1")
   func testPart1() async throws {
     let challenge = Day11(
-      data: """
-        125 17
-        """
+      data: testData
     )
     #expect(challenge.part1() == 55312)
   }