Index: unittests/Tooling/DiagnosticsYamlTest.cpp
===================================================================
--- unittests/Tooling/DiagnosticsYamlTest.cpp
+++ unittests/Tooling/DiagnosticsYamlTest.cpp
@@ -82,7 +82,7 @@
             "    Message:         'message #3'\n"
             "    FileOffset:      72\n"
             "    FilePath:        'path/to/source2.cpp'\n"
-            "    Replacements:    \n"
+            "    Replacements:    []\n"
             "...\n",
             YamlContentStream.str());
 }
@@ -113,7 +113,7 @@
                             "    Message:         'message #3'\n"
                             "    FileOffset:      98\n"
                             "    FilePath:        path/to/source.cpp\n"
-                            "    Replacements:    \n"
+                            "    Replacements:    []\n"
                             "...\n";
   TranslationUnitDiagnostics TUDActual;
   yaml::Input YAML(YamlContent);
Index: unittests/Tooling/RefactoringActionRulesTest.cpp
===================================================================
--- unittests/Tooling/RefactoringActionRulesTest.cpp
+++ unittests/Tooling/RefactoringActionRulesTest.cpp
@@ -117,8 +117,8 @@
                  "Key:             'input.cpp:30'\n"
                  "FilePath:        input.cpp\n"
                  "Error:           ''\n"
-                 "InsertedHeaders: \n"
-                 "RemovedHeaders:  \n"
+                 "InsertedHeaders: []\n"
+                 "RemovedHeaders:  []\n"
                  "Replacements:    \n" // Extra whitespace here!
                  "  - FilePath:        input.cpp\n"
                  "    Offset:          30\n"