diff --git a/tests/scripts/generate_code.pl b/tests/scripts/generate_code.pl
index ba61b680a..30ee6b01c 100755
--- a/tests/scripts/generate_code.pl
+++ b/tests/scripts/generate_code.pl
@@ -131,7 +131,7 @@ print TEST_FILE << "END";
 
 
 /*----------------------------------------------------------------------------*/
-/* Common helper functions */
+/* Common helper code */
 
 $test_common_helpers
 
diff --git a/tests/suites/helpers.function b/tests/suites/helpers.function
index 8f681dbd4..c18eed895 100644
--- a/tests/suites/helpers.function
+++ b/tests/suites/helpers.function
@@ -1,3 +1,6 @@
+/*----------------------------------------------------------------------------*/
+/* Headers */
+
 #if defined(MBEDTLS_PLATFORM_C)
 #include "mbedtls/platform.h"
 #else
@@ -12,6 +15,10 @@
 #define mbedtls_snprintf   snprintf
 #endif
 
+#if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
+#include "mbedtls/memory_buffer_alloc.h"
+#endif
+
 #ifdef _MSC_VER
 #include <basetsd.h>
 typedef UINT32 uint32_t;
@@ -23,6 +30,25 @@ typedef UINT32 uint32_t;
 #include <stdlib.h>
 #include <string.h>
 
+
+/*----------------------------------------------------------------------------*/
+/* Global variables */
+
+static int test_errors = 0;
+
+
+/*----------------------------------------------------------------------------*/
+/* Macros */
+
+#define TEST_ASSERT( TEST )                         \
+    do {                                            \
+        if( ! (TEST) )                              \
+        {                                           \
+            test_fail( #TEST );                     \
+            goto exit;                              \
+        }                                           \
+    } while( 0 )
+
 #define assert(a) if( !( a ) )                                      \
 {                                                                   \
     mbedtls_fprintf( stderr, "Assertion Failed at %s:%d - %s\n",   \
@@ -53,11 +79,15 @@ typedef UINT32 uint32_t;
 }
 #endif
 
+
+/*----------------------------------------------------------------------------*/
+/* Helper Functions */
+
 static int unhexify( unsigned char *obuf, const char *ibuf )
 {
     unsigned char c, c2;
     int len = strlen( ibuf ) / 2;
-    assert( strlen( ibuf ) % 2 == 0 ); // must be even number of bytes
+    assert( strlen( ibuf ) % 2 == 0 ); /* must be even number of bytes */
 
     while( *ibuf != 0 )
     {
@@ -298,3 +328,12 @@ static int rnd_pseudo_rand( void *rng_state, unsigned char *output, size_t len )
 
     return( 0 );
 }
+
+static void test_fail( const char *test )
+{
+    test_errors++;
+    if( test_errors == 1 )
+        mbedtls_printf( "FAILED\n" );
+    mbedtls_printf( "  %s\n", test );
+}
+
diff --git a/tests/suites/main_test.function b/tests/suites/main_test.function
index 2a21441a4..7ec69b45d 100644
--- a/tests/suites/main_test.function
+++ b/tests/suites/main_test.function
@@ -1,44 +1,6 @@
-#include <string.h>
-
-#if defined(MBEDTLS_PLATFORM_C)
-#include "mbedtls/platform.h"
-#else
-#include <stdio.h>
-#include <stdlib.h>
-#define mbedtls_exit       exit
-#define mbedtls_free       free
-#define mbedtls_calloc     calloc
-#define mbedtls_fprintf    fprintf
-#define mbedtls_printf     printf
-#define mbedtls_snprintf   snprintf
-#endif
-
-#if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
-#include "mbedtls/memory_buffer_alloc.h"
-#endif
-
-static int test_errors = 0;
-
 SUITE_PRE_DEP
 #define TEST_SUITE_ACTIVE
 
-static void test_fail( const char *test )
-{
-    test_errors++;
-    if( test_errors == 1 )
-        mbedtls_printf( "FAILED\n" );
-    mbedtls_printf( "  %s\n", test );
-}
-
-#define TEST_ASSERT( TEST )                         \
-    do {                                            \
-        if( ! (TEST) )                              \
-        {                                           \
-            test_fail( #TEST );                     \
-            goto exit;                              \
-        }                                           \
-    } while( 0 )
-
 int verify_string( char **str )
 {
     if( (*str)[0] != '"' ||
@@ -190,7 +152,7 @@ int parse_arguments( char *buf, size_t len, char *params[50] )
         p++;
     }
 
-    // Replace newlines, question marks and colons in strings
+    /* Replace newlines, question marks and colons in strings */
     for( i = 0; i < cnt; i++ )
     {
         p = params[i];