Add more tests to 2024 day 9

Author: sim642

src/main/scala/eu/sim642/adventofcode2024/Day9.scala

@@ -22,6 +22,15 @@ object Day9 {
     })._1
   }
 
+  def filesystemToString(filesystem: Filesystem): String = {
+    val sb = new StringBuilder
+    filesystem.foreach({
+      case File(id, size) => sb ++= ('0' + id).toChar.toString * size // TODO: toDigit?
+      case Free(size) => sb ++= "." * size
+    })
+    sb.toString
+  }
+
   trait Part {
     def compact(filesystem: Filesystem): Filesystem
 

src/test/scala/eu/sim642/adventofcode2024/Day9Test.scala

@@ -9,18 +9,22 @@ class Day9Test extends AnyFunSuite {
   val exampleInput2 = "2333133121414131402"
 
   test("Part 1 examples") {
-    //assert(Part1.compactChecksum(parseFilesystem(exampleInput)) == ???)
-    //println(Part1.compact(parseFilesystem(exampleInput)))
-    //println(Part1.compact(parseFilesystem(exampleInput2)))
+    assert(filesystemToString(Part1.compact(parseFilesystem(exampleInput))) ==
+      "022111222") // trailing Free trimmed
+    assert(filesystemToString(Part1.compact(parseFilesystem(exampleInput2))) ==
+      "0099811188827773336446555566") // trailing Free trimmed
     assert(Part1.compactChecksum(parseFilesystem(exampleInput2)) == 1928)
+
+    assert(Part1.compactChecksum(parseFilesystem(exampleInput)) == 69) // not in text
   }
 
   test("Part 1 input answer") {
     assert(Part1.compactChecksum(parseFilesystem(input)) == 6310675819476L)
   }
 
   test("Part 2 examples") {
-    //println(Part2.compact(parseFilesystem(exampleInput2)))
+    assert(filesystemToString(Part2.compact(parseFilesystem(exampleInput2))) ==
+      "00992111777.44.333....5555.6666.....8888..")
     assert(Part2.compactChecksum(parseFilesystem(exampleInput2)) == 2858)
   }