[log] One more test on hash [de]serialization

platform/vcs-log/impl/test/com/intellij/vcs/log/impl/HashSerializeTest.java

@@ -16,11 +16,14 @@
 package com.intellij.vcs.log.impl;
 
 import com.intellij.openapi.util.io.FileUtil;
+import com.intellij.util.containers.ContainerUtil;
 import com.intellij.util.io.DataOutputStream;
 import org.jetbrains.annotations.NotNull;
 import org.junit.Test;
 
 import java.io.*;
+import java.util.Arrays;
+import java.util.List;
 
 import static org.junit.Assert.assertEquals;
 
@@ -30,7 +33,7 @@ public class HashSerializeTest {
   public void full_hash() throws IOException {
     HashImpl hash = (HashImpl)HashImpl.build("d35ee91fad4a04bce0ea91a762cc8f3bf3e1929f");
     File file = writeToTempFile(hash);
-    HashImpl newHash = readFromFile(file);
+    HashImpl newHash = readFromFile(file).get(0);
     assertEquals(hash, newHash);
   }
 
@@ -38,16 +41,28 @@ public class HashSerializeTest {
   public void short_hash() throws IOException {
     HashImpl hash = (HashImpl)HashImpl.build("d35ee91");
     File file = writeToTempFile(hash);
-    HashImpl newHash = readFromFile(file);
+    HashImpl newHash = readFromFile(file).get(0);
     assertEquals(hash, newHash);
   }
+  
+  @Test
+  public void two_different_hashes() throws IOException {
+    HashImpl hash1 = (HashImpl)HashImpl.build("d35ee91");
+    HashImpl hash2 = (HashImpl)HashImpl.build("d35ee91fad4a04bce0ea91a762cc8f3bf3e1929f");
+    File file = writeToTempFile(hash1, hash2);
+    List<HashImpl> hashes = readFromFile(file);
+    assertEquals(Arrays.asList(hash1, hash2), hashes);
+
+  }
 
   @NotNull
-  private static File writeToTempFile(@NotNull HashImpl hash) throws IOException {
+  private static File writeToTempFile(@NotNull HashImpl... hashes) throws IOException {
     File file = FileUtil.createTempFile("", "");
     DataOutputStream out = new DataOutputStream(new FileOutputStream(file));
     try {
-      hash.write(out);
+      for (HashImpl hash : hashes) {
+        hash.write(out);
+      }
     }
     finally {
       out.close();
@@ -56,15 +71,17 @@ public class HashSerializeTest {
   }
 
   @NotNull
-  private static HashImpl readFromFile(@NotNull File file) throws IOException {
-    HashImpl newHash;
+  private static List<HashImpl> readFromFile(@NotNull File file) throws IOException {
+    List<HashImpl> result = ContainerUtil.newArrayList();
     DataInputStream in = new DataInputStream(new FileInputStream(file));
     try {
-      newHash = (HashImpl)HashImpl.read(in);
+      while (in.available() > 0) {
+        result.add((HashImpl)HashImpl.read(in));
+      }
     }
     finally {
       in.close();
     }
-    return newHash;
+    return result;
   }
 }