Converting various classes to namedtuples

appengine/findit/crash/test/stacktrace_test.py

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 from common.dependency import Dependency
 from crash.stacktrace import StackFrame
 from crash.stacktrace import CallStack
 from crash.stacktrace import Stacktrace
 from crash.test.stacktrace_test_suite import StacktraceTestSuite
 from crash.type_enums import CallStackFormatType
 from crash.type_enums import CallStackLanguageType
 
 class CallStackTest(StacktraceTestSuite):
 
   def testStackFrameToString(self):
     self.assertEqual(
         StackFrame(0, 'src/', 'func', 'f.cc', 'src/f.cc', []).ToString(),
         '#0 in func @ f.cc')
     self.assertEqual(
         StackFrame(0, 'src/', 'func', 'f.cc', 'src/f.cc', [1]).ToString(),
         '#0 in func @ f.cc:1')
     self.assertEqual(
         StackFrame(0, 'src/', 'func', 'f.cc', 'src/f.cc', [1, 2]).ToString(),
         '#0 in func @ f.cc:1:1')
 
   def testBlameUrlForStackFrame(self):
     frame = StackFrame(0, 'src/', 'func', 'f.cc', 'src/f.cc', [])
     self.assertEqual(frame.BlameUrl('1'), None)
 
-    frame.repo_url = 'https://repo_url'
+    frame = frame._replace(repo_url = 'https://repo_url')
     self.assertEqual(frame.BlameUrl('1'), 'https://repo_url/+blame/1/f.cc')
 
-    frame.crashed_line_numbers = [9, 10]
+    frame = frame._replace(crashed_line_numbers = [9, 10])
     self.assertEqual(frame.BlameUrl('1'), 'https://repo_url/+blame/1/f.cc#9')
 
   def testFrameListInitCallStack(self):
     stack = CallStack(0)
     stack.extend([StackFrame(0, 'src/', '', 'func', 'f.cc', [2])])
 
     copy_stack = CallStack(stack.priority, frame_list=stack)
     self._VerifyTwoCallStacksEqual(copy_stack, stack)
 
   def testParseLineForJavaCallstackFormat(self):
@@ skipping 119 matching lines @@
     stacktrace.extend(callstack_list)
 
     self._VerifyTwoCallStacksEqual(stacktrace.crash_stack,
                                    callstack_list[0])
 
   def testInitStacktaceByCopyAnother(self):
     stack_trace = Stacktrace()
     stack_trace.extend([CallStack(0), CallStack(1)])
 
     self._VerifyTwoStacktracesEqual(Stacktrace(stack_trace), stack_trace)