feat: read replays from resources

arithmetization/src/main/java/net/consensys/linea/blockcapture/snapshots/BlockSnapshot.java

@@ -18,12 +18,13 @@
 import java.util.List;
 
 import org.hyperledger.besu.ethereum.core.BlockHeader;
+import org.hyperledger.besu.ethereum.core.Transaction;
 import org.hyperledger.besu.plugin.data.BlockBody;
 
 public record BlockSnapshot(BlockHeaderSnapshot header, List<TransactionSnapshot> txs) {
   public static BlockSnapshot of(final BlockHeader header, final BlockBody body) {
     return new BlockSnapshot(
         BlockHeaderSnapshot.from(header),
-        body.getTransactions().stream().map(TransactionSnapshot::of).toList());
+        body.getTransactions().stream().map(t -> TransactionSnapshot.of((Transaction) t)).toList());
   }
 }

arithmetization/src/test/java/net/consensys/linea/zktracer/ReplaysTests.java

@@ -15,17 +15,41 @@
 
 package net.consensys.linea.zktracer;
 
+import static org.junit.jupiter.api.Assertions.fail;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.zip.GZIPInputStream;
+
+import lombok.extern.slf4j.Slf4j;
 import net.consensys.linea.zktracer.testing.ToyExecutionEnvironment;
 import org.junit.jupiter.api.Test;
 
+@Slf4j
 public class ReplaysTests {
   public static void replay(String filename) {
-    ToyExecutionEnvironment environment = ToyExecutionEnvironment.builder().build();
-    environment.replay(filename);
+    final InputStream fileStream =
+        ReplaysTests.class.getClassLoader().getResourceAsStream("replays/%s".formatted(filename));
+    if (fileStream == null) {
+      fail("unable to find %s in replay resources".formatted(filename));
+    }
+
+    final InputStream stream;
+    try {
+      stream = filename.toLowerCase().endsWith("gz") ? new GZIPInputStream(fileStream) : fileStream;
+    } catch (IOException e) {
+      log.error("while loading {}: {}", filename, e.getMessage());
+      throw new RuntimeException(e);
+    }
+    ToyExecutionEnvironment.builder()
+        .build()
+        .replay(new BufferedReader(new InputStreamReader(stream)));
   }
 
   @Test
   void replayOneFile() {
-    replay("/home/franklin/asdf.json");
+    replay("start-vs-prepare-tx.json.gz");
   }
 }

arithmetization/src/test/java/net/consensys/linea/zktracer/testing/ToyExecutionEnvironment.java

@@ -18,8 +18,8 @@
 import static net.consensys.linea.zktracer.runtime.stack.Stack.MAX_STACK_SIZE;
 import static org.assertj.core.api.Assertions.assertThat;
 
-import java.io.FileReader;
 import java.io.IOException;
+import java.io.Reader;
 import java.math.BigInteger;
 import java.nio.file.Files;
 import java.nio.file.Path;
@@ -124,11 +124,11 @@ public void run() {
    *
    * @param replayFile the file containing the conflation
    */
-  public void replay(final String replayFile) {
+  public void replay(final Reader replayFile) {
     Gson gson = new Gson();
     ConflationSnapshot conflation;
     try {
-      conflation = gson.fromJson(new FileReader(replayFile), ConflationSnapshot.class);
+      conflation = gson.fromJson(replayFile, ConflationSnapshot.class);
     } catch (Exception e) {
       log.error(e.getMessage());
       return;