Add NullCharPointer test

test/CMakeLists.txt

@@ -16,6 +16,7 @@ set(SOURCES
     Conditional.cpp
     TestAppender.h
     Main.cpp
+    NullCharPointer.cpp
     Path.cpp
     Printf.cpp
     SimpleTypes.cpp

test/NullCharPointer.cpp

@@ -0,0 +1,86 @@
+#include "Common.h"
+#include <vector>
+#include <utility>
+
+SCENARIO("handling null char pointers")
+{
+    GIVEN("logger is initialised")
+    {
+        plog::TestAppender testAppender;
+        plog::Logger<PLOG_DEFAULT_INSTANCE_ID> logger(plog::verbose);
+        logger.addAppender(&testAppender);
+
+        WHEN("type is char* and its value is NULL")
+        {
+            char* var = NULL;
+            PLOGI << var;
+
+            THEN("the result is as expected")
+            {
+                CHECK_EQ(testAppender.getMessage(), PLOG_NSTR("(null)"));
+            }
+        }
+
+        WHEN("type is std::vector<char*> and value of elements is NULL")
+        {
+            std::vector<char*> var;
+            var.push_back(NULL);
+            var.push_back(NULL);
+            PLOGI << var;
+
+            THEN("the result is as expected")
+            {
+                CHECK_EQ(testAppender.getMessage(), PLOG_NSTR("[(null), (null)]"));
+            }
+        }
+
+        WHEN("type is std::pair<char*, char*> and value of elements is NULL")
+        {
+            std::pair<char*, char*> var;
+            PLOGI << var;
+
+            THEN("the result is as expected")
+            {
+                CHECK_EQ(testAppender.getMessage(), PLOG_NSTR("(null):(null)"));
+            }
+        }
+
+#if PLOG_ENABLE_WCHAR_INPUT
+        WHEN("type is wchar_t* and its value is NULL")
+        {
+            wchar_t* var = NULL;
+            PLOGI << var;
+
+            THEN("the result is as expected")
+            {
+                CHECK_EQ(testAppender.getMessage(), PLOG_NSTR("(null)"));
+            }
+        }
+
+        WHEN("type is std::vector<wchar_t*> and value of elements is NULL")
+        {
+            std::vector<wchar_t*> var;
+            var.push_back(NULL);
+            var.push_back(NULL);
+
+            PLOGI << var;
+
+            THEN("the result is as expected")
+            {
+                CHECK_EQ(testAppender.getMessage(), PLOG_NSTR("[(null), (null)]"));
+            }
+        }
+
+        WHEN("type is std::pair<wchar_t*, wchar_t*> and value of elements is NULL")
+        {
+            std::pair<wchar_t*, wchar_t*> var;
+            PLOGI << var;
+
+            THEN("the result is as expected")
+            {
+                CHECK_EQ(testAppender.getMessage(), PLOG_NSTR("(null):(null)"));
+            }
+        }
+#endif
+    }
+}