Gather data

src/test/java/puzzle/TestSort.java

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+package puzzle;
+import puzzle.ThemePoolBuilderLength.Lexicon;
+import java.nio.file.*;
+import java.util.*;
+public class TestSort {
+    public static void main(String[] args) throws Exception {
+        Lexicon lex = new Lexicon(
+            Arrays.asList("A", "B", "C"),
+            new HashMap<>(),
+            new int[]{10, 30, 20},
+            new BitSet[9]
+        );
+        BitSet bs = new BitSet();
+        bs.set(0); bs.set(1); bs.set(2);
+        Path p = Paths.get("test_pool.txt");
+        ThemePoolBuilderLength.writeWordList(p, lex, bs);
+        List<String> lines = Files.readAllLines(p);
+        System.out.println("Sorted words: " + lines);
+        if (lines.get(0).equals("B") && lines.get(1).equals("C") && lines.get(2).equals("A")) {
+            System.out.println("SUCCESS");
+        } else {
+            System.out.println("FAILURE");
+            System.exit(1);
+        }
+    }
+}