Index: test/clang-apply-replacements/Inputs/basic/file1.yaml
===================================================================
--- test/clang-apply-replacements/Inputs/basic/file1.yaml
+++ test/clang-apply-replacements/Inputs/basic/file1.yaml
@@ -2,6 +2,9 @@
 MainSourceFile:     source1.cpp
 Diagnostics:
   - DiagnosticName: test-basic
+    Message: Fix
+    FilePath: $(path)/basic.h
+    FileOffset: 242    
     Replacements:
       - FilePath:        $(path)/basic.h
         Offset:          242
Index: test/clang-apply-replacements/Inputs/basic/file2.yaml
===================================================================
--- test/clang-apply-replacements/Inputs/basic/file2.yaml
+++ test/clang-apply-replacements/Inputs/basic/file2.yaml
@@ -2,6 +2,9 @@
 MainSourceFile:     source2.cpp
 Diagnostics:
   - DiagnosticName: test-basic
+    Message: Fix
+    FilePath: $(path)/basic.h
+    FileOffset: 148
     Replacements:
       - FilePath:        $(path)/basic.h
         Offset:          148
Index: test/clang-apply-replacements/Inputs/conflict/file1.yaml
===================================================================
--- test/clang-apply-replacements/Inputs/conflict/file1.yaml
+++ test/clang-apply-replacements/Inputs/conflict/file1.yaml
@@ -2,6 +2,9 @@
 MainSourceFile: source1.cpp
 Diagnostics:
   - DiagnosticName: test-conflict
+    Message: Fix
+    FilePath: $(path)/common.h
+    FileOffset: 106
     Replacements:
       - FilePath:        $(path)/common.h
         Offset:          106
Index: test/clang-apply-replacements/Inputs/conflict/file2.yaml
===================================================================
--- test/clang-apply-replacements/Inputs/conflict/file2.yaml
+++ test/clang-apply-replacements/Inputs/conflict/file2.yaml
@@ -2,6 +2,9 @@
 MainSourceFile: source2.cpp
 Diagnostics:     
   - DiagnosticName:  test-conflict
+    Message: Fix
+    FilePath: $(path)/common.h
+    FileOffset: 106    
     Replacements:
       - FilePath:        $(path)/common.h
         Offset:          106
Index: test/clang-apply-replacements/Inputs/conflict/file3.yaml
===================================================================
--- test/clang-apply-replacements/Inputs/conflict/file3.yaml
+++ test/clang-apply-replacements/Inputs/conflict/file3.yaml
@@ -2,6 +2,9 @@
 MainSourceFile: source1.cpp
 Diagnostics:
   - DiagnosticName:  test-conflict
+    Message: Fix
+    FilePath: $(path)/common.h
+    FileOffset: 169
     Replacements:
       - FilePath:        $(path)/common.h
         Offset:          169
Index: test/clang-apply-replacements/Inputs/crlf/file1.yaml
===================================================================
--- test/clang-apply-replacements/Inputs/crlf/file1.yaml
+++ test/clang-apply-replacements/Inputs/crlf/file1.yaml
@@ -2,6 +2,9 @@
 MainSourceFile:      source1.cpp
 Diagnostics:
   - DiagnosticName:  test-crlf
+    Message: Fix
+    FilePath: $(path)/crlf.cpp
+    FileOffset: 79    
     Replacements:    
       - FilePath:        $(path)/crlf.cpp
         Offset:          79
Index: test/clang-apply-replacements/Inputs/format/no.yaml
===================================================================
--- test/clang-apply-replacements/Inputs/format/no.yaml
+++ test/clang-apply-replacements/Inputs/format/no.yaml
@@ -2,6 +2,9 @@
 MainSourceFile:  no.cpp
 Diagnostics:     
   - DiagnosticName:  test-no
+    Message: Fix
+    FilePath: $(path)/no.cpp
+    FileOffset: 94
     Replacements:    
       - FilePath:        $(path)/no.cpp
         Offset:          94
Index: test/clang-apply-replacements/Inputs/format/yes.yaml
===================================================================
--- test/clang-apply-replacements/Inputs/format/yes.yaml
+++ test/clang-apply-replacements/Inputs/format/yes.yaml
@@ -4,6 +4,9 @@
 MainSourceFile:  yes.cpp
 Diagnostics:     
   - DiagnosticName:  test-yes
+    Message: Fix
+    FilePath: $(path)/yes.cpp
+    FileOffset: 494
     Replacements:    
       - FilePath:        $(path)/yes.cpp
         Offset:          494
Index: unittests/clang-apply-replacements/ApplyReplacementsTest.cpp
===================================================================
--- /dev/null
+++ unittests/clang-apply-replacements/ApplyReplacementsTest.cpp
@@ -0,0 +1,49 @@
+//===- clang-apply-replacements/ApplyReplacementsTest.cpp ----------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang-apply-replacements/Tooling/ApplyReplacements.h"
+#include "gtest/gtest.h"
+
+using namespace clang::replace;
+using namespace llvm;
+
+namespace clang { 
+namespace tooling {
+
+static TUDiagnostics makeTUDiagnostics(const std::string &MainSourceFile,
+                                       StringRef DiagnosticName,
+                                       const DiagnosticMessage &Message,
+                                       const StringMap<Replacements> &Replacements,
+                                       StringRef BuildDirectory) {
+  TUDiagnostics TUs;
+  TUs.push_back({ MainSourceFile, 
+                  { { DiagnosticName, Message, Replacements, {}, 
+                      Diagnostic::Warning, BuildDirectory } } 
+  });
+  return TUs;
+}
+
+// Test to ensure diagnostics with no fixes, will be merged correctly 
+// before applying.
+TEST(ApplyReplacementsTest, mergeDiagnosticsWithNoFixes) {
+  IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts(new DiagnosticOptions());
+  DiagnosticsEngine Diagnostics(
+    IntrusiveRefCntPtr<DiagnosticIDs>(new DiagnosticIDs()), DiagOpts.get());
+  FileManager Files((FileSystemOptions()));
+  SourceManager SM(Diagnostics, Files);
+  TUDiagnostics TUs = makeTUDiagnostics("path/to/source.cpp", "diagnostic",
+                                        {}, {}, "path/to");
+  FileToReplacementsMap ReplacementsMap;
+
+  EXPECT_TRUE(mergeAndDeduplicate(TUs, ReplacementsMap, SM));
+  EXPECT_TRUE(ReplacementsMap.empty());
+}
+
+} // end namespace tooling
+} // end namespace clang
Index: unittests/clang-apply-replacements/CMakeLists.txt
===================================================================
--- unittests/clang-apply-replacements/CMakeLists.txt
+++ unittests/clang-apply-replacements/CMakeLists.txt
@@ -8,6 +8,7 @@
   )
 
 add_extra_unittest(ClangApplyReplacementsTests
+  ApplyReplacementsTest.cpp
   ReformattingTest.cpp
   )