diff --git a/test/Makefile b/test/Makefile
index f37b9ea630d9326c261649106fe0c504b99d66f5..89ece81dd0d1e24202edfdd7a16a23e8170a83ae 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -15,8 +15,8 @@ CFLAGS += -Wbad-function-cast -Wcast-qual -Wold-style-definition -Wshadow -Wstri
 CFLAGS += $(DEBUG)
 DEFINES =  -D UNITY_OUTPUT_CHAR=putcharSpy
 DEFINES += -D UNITY_OUTPUT_CHAR_HEADER_DECLARATION=putcharSpy\(int\)
-#DEFINES += -D UNITY_OUTPUT_FLUSH=flushSpy
-#DEFINES += -D UNITY_OUTPUT_FLUSH_HEADER_DECLARATION=flushSpy\(void\)
+DEFINES += -D UNITY_OUTPUT_FLUSH=flushSpy
+DEFINES += -D UNITY_OUTPUT_FLUSH_HEADER_DECLARATION=flushSpy\(void\)
 DEFINES += $(UNITY_SUPPORT_64) $(UNITY_INCLUDE_DOUBLE)
 UNITY_SUPPORT_64 = -D UNITY_SUPPORT_64
 UNITY_INCLUDE_DOUBLE = -D UNITY_INCLUDE_DOUBLE
diff --git a/test/testdata/testRunnerGenerator.c b/test/testdata/testRunnerGenerator.c
index e036dd96749d8ff57b52354633fe506271521fa0..7a4d63b8a2c51190601615facbe1cf21ffe5bb1c 100644
--- a/test/testdata/testRunnerGenerator.c
+++ b/test/testdata/testRunnerGenerator.c
@@ -21,7 +21,10 @@
 
 /* Support for Meta Test Rig */
 #define TEST_CASE(a)
-void putcharSpy(int c) { (void)putchar(c);} // include passthrough for linking tests
+
+/* Include Passthroughs for Linking Tests */
+void putcharSpy(int c) { (void)putchar(c);}
+void flushSpy(int c) {}
 
 /* Global Variables Used During These Tests */
 int CounterSetup = 0;
diff --git a/test/testdata/testRunnerGeneratorSmall.c b/test/testdata/testRunnerGeneratorSmall.c
index c683749480fc8b7794f1dc1a793322b2c70e1092..a8707fb6c9d9972d3f0895441164eaf0b7681122 100644
--- a/test/testdata/testRunnerGeneratorSmall.c
+++ b/test/testdata/testRunnerGeneratorSmall.c
@@ -13,7 +13,10 @@ TEST_FILE("some_file.c")
 
 /* Support for Meta Test Rig */
 #define TEST_CASE(a)
-void putcharSpy(int c) { (void)putchar(c);} // include passthrough for linking tests
+
+/* Include Passthroughs for Linking Tests */
+void putcharSpy(int c) { (void)putchar(c);}
+void flushSpy(int c) {}
 
 /* Global Variables Used During These Tests */
 int CounterSetup = 0;
diff --git a/test/testdata/testRunnerGeneratorWithMocks.c b/test/testdata/testRunnerGeneratorWithMocks.c
index 7eb0b671f6b90c502b9c53ce305425000f2e7789..a7d622d5962c72fd922096bf0b06cd026277bd65 100644
--- a/test/testdata/testRunnerGeneratorWithMocks.c
+++ b/test/testdata/testRunnerGeneratorWithMocks.c
@@ -22,7 +22,10 @@
 
 /* Support for Meta Test Rig */
 #define TEST_CASE(a)
-void putcharSpy(int c) { (void)putchar(c);} // include passthrough for linking tests
+
+/* Include Passthroughs for Linking Tests */
+void putcharSpy(int c) { (void)putchar(c);}
+void flushSpy(int c) {}
 
 /* Global Variables Used During These Tests */
 int CounterSetup = 0;
diff --git a/test/tests/testparameterized.c b/test/tests/testparameterized.c
index aa6d1732c2de1a30b68b2b49ebe241c1536e930b..7be7f2bd02784b9839d4d2e11ba397fa68ddb038 100644
--- a/test/tests/testparameterized.c
+++ b/test/tests/testparameterized.c
@@ -8,10 +8,13 @@
 #include <stdio.h>
 #include "unity.h"
 
-void putcharSpy(int c) { (void)putchar(c);} // include passthrough for linking tests
-
+/* Support for Meta Test Rig */
 #define TEST_CASE(...)
 
+/* Include Passthroughs for Linking Tests */
+void putcharSpy(int c) { (void)putchar(c);}
+void flushSpy(int c) {}
+
 #define EXPECT_ABORT_BEGIN \
     if (TEST_PROTECT())    \
     {
diff --git a/test/tests/testunity.c b/test/tests/testunity.c
index af06647f81c0565dd20b0593b6b2d0586fe5d6db..1884cbb1ae9639434fbfad42431a86e9a54139ff 100644
--- a/test/tests/testunity.c
+++ b/test/tests/testunity.c
@@ -3335,6 +3335,14 @@ void putcharSpy(int c)
 #endif
 }
 
+#if 0
+void flushSpy(void)
+{
+    static unsigned int calls = 0;
+    calls++; // count every call
+}
+#endif
+
 void testFailureCountIncrementsAndIsReturnedAtEnd(void)
 {
     UNITY_UINT savedFailures = Unity.TestFailures;