Add some unit tests for Linux WriteSymbolFile

src/common/module.h

Index: src/common/module.h
===================================================================
--- a/src/common/module.h
+++ b/src/common/module.h
@@ -33,18 +33,17 @@
 
 // module.h: Define google_breakpad::Module. A Module holds debugging
 // information, and can write that information out as a Breakpad
 // symbol file.
 
 #ifndef COMMON_LINUX_MODULE_H__
 #define COMMON_LINUX_MODULE_H__
 
-#include <stdio.h>
-
+#include <iostream>
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "google_breakpad/common/breakpad_types.h"
 
 namespace google_breakpad {
@@ -259,28 +258,28 @@ class Module {
   // Call AssignSourceIds, and write this module to STREAM in the
   // breakpad symbol format. Return true if all goes well, or false if
   // an error occurs. This method writes out:
   // - a header based on the values given to the constructor,
   // - the source files added via FindFile, and finally
   // - the functions added via AddFunctions, each with its lines.
   // Addresses in the output are all relative to the load address
   // established by SetLoadAddress.
-  bool Write(FILE *stream);
+  bool Write(std::ostream &stream);
 
  private:
 
   // Report an error that has occurred writing the symbol file, using
   // errno to find the appropriate cause.  Return false.
   static bool ReportError();
 
   // Write RULE_MAP to STREAM, in the form appropriate for 'STACK CFI'
   // records, without a final newline. Return true if all goes well;
   // if an error occurs, return false, and leave errno set.
-  static bool WriteRuleMap(const RuleMap &rule_map, FILE *stream);
+  static bool WriteRuleMap(const RuleMap &rule_map, std::ostream &stream);
 
   // Module header entries.
   string name_, os_, architecture_, id_;
 
   // The module's nominal load address.  Addresses for functions and
   // lines are absolute, assuming the module is loaded at this
   // address.
   Address load_address_;