--- a/agent/src/jetbrains/buildServer/symbols/PdbFilePatcher.java	Wed Jul 31 11:38:03 2013 +0400
+++ b/agent/src/jetbrains/buildServer/symbols/PdbFilePatcher.java	Wed Jul 31 11:45:40 2013 +0400
@@ -3,7 +3,6 @@
 import jetbrains.buildServer.util.FileUtil;
 
 import java.io.File;
-import java.io.IOException;
 import java.util.Collection;
 
 /**
@@ -22,11 +21,14 @@
     myIndexInputProvider = indexInputProvider;
   }
 
-  public void patch(File symbolsFile) throws IOException {
+  public void patch(File symbolsFile) throws Exception {
     final Collection<File> sourceFiles = mySrcToolExe.getReferencedSourceFiles(symbolsFile);
-    final File tmpFile = FileUtil.createTempFile(myHomeDir, "pdb-patch", ".xml", false);
+    final File tmpFile = FileUtil.createTempFile(myHomeDir, "pdb-", ".patch", false);
     myIndexInputProvider.dumpStreamToFile(tmpFile, sourceFiles);
     myPdbStrExe.doCommand(PdbStrExeCommand.WRITE, symbolsFile, tmpFile, PdbStrExe.SRCSRV_STREAM_NAME);
-    //TODO: check that data was actually written
+    final File tmpFile1 = FileUtil.createTempFile(myHomeDir, "pdb-", ".patch", false);
+    myPdbStrExe.doCommand(PdbStrExeCommand.READ, symbolsFile, tmpFile1, PdbStrExe.SRCSRV_STREAM_NAME);
+    if(!FileUtil.checkContentEqual(tmpFile, tmpFile1))
+      throw new Exception("'srcsrv' stream content written to pdb differs from initial one");
   }
 }

--- a/tests/src/PdbFilePatcherTest.java	Wed Jul 31 11:38:03 2013 +0400
+++ b/tests/src/PdbFilePatcherTest.java	Wed Jul 31 11:45:40 2013 +0400
@@ -25,7 +25,7 @@
   }
 
   @Test
-  public void testFoo() throws IOException {
+  public void testFoo() throws Exception {
     File tempFile = new File(myTestHomeDir, "tmp.pdb");
     FileUtil.copy(new File("c:\\temp\\JetBrains.CommandLine.Symbols.pdb"), tempFile);
     myPatcher.patch(tempFile);