diff --git a/test.cpp b/test.cpp
index 9583468f..b6031c69 100644
--- a/test.cpp
+++ b/test.cpp
@@ -102,11 +102,11 @@ static std::string readfile(const char code[], std::size_t size, simplecpp::Outp
     return makeTokenList(code,size,files,std::string(),outputList).stringify();
 }
 
-static std::string preprocess(const char code[], const simplecpp::DUI &dui, simplecpp::OutputList *outputList)
+static std::string preprocess(const char code[], const simplecpp::DUI &dui, simplecpp::OutputList *outputList, const std::string &file = std::string())
 {
     std::vector<std::string> files;
     simplecpp::FileDataCache cache;
-    simplecpp::TokenList tokens = makeTokenList(code,files);
+    simplecpp::TokenList tokens = makeTokenList(code,files, file);
     if (dui.removeComments)
         tokens.removeComments();
     simplecpp::TokenList tokens2(files);
@@ -120,6 +120,11 @@ static std::string preprocess(const char code[])
     return preprocess(code, simplecpp::DUI(), nullptr);
 }
 
+static std::string preprocess(const char code[], const std::string &file)
+{
+    return preprocess(code, simplecpp::DUI(), nullptr, file);
+}
+
 static std::string preprocess(const char code[], const simplecpp::DUI &dui)
 {
     return preprocess(code, dui, nullptr);
@@ -193,7 +198,7 @@ static void backslash()
 
 static void builtin()
 {
-    ASSERT_EQUALS("\"\" 1 0", preprocess("__FILE__ __LINE__ __COUNTER__"));
+    ASSERT_EQUALS("\"test.c\" 1 0", preprocess("__FILE__ __LINE__ __COUNTER__", "test.c"));
     ASSERT_EQUALS("\n\n3", preprocess("\n\n__LINE__"));
     ASSERT_EQUALS("\n\n0", preprocess("\n\n__COUNTER__"));
     ASSERT_EQUALS("\n\n0 1", preprocess("\n\n__COUNTER__ __COUNTER__"));