Improves SkipWhitespace test

test/unittest/simdtest.cpp

@@ -46,18 +46,23 @@ using namespace rapidjson_simd;
 #endif
 
 TEST(SIMD, SIMD_SUFFIX(SkipWhitespace)) {
+    for (int step = 1; step < 32; step++) {
         char buffer[1025];
         for (size_t i = 0; i < 1024; i++)
             buffer[i] = " \t\r\n"[i % 4];
-    for (size_t i = 0; i < 1024; i += 31)
+        for (size_t i = 0; i < 1024; i += step)
             buffer[i] = 'X';
         buffer[1024] = '\0';
 
         StringStream s(buffer);
-    for(;;) {
+        size_t i = 0;
+        for (;;) {
             SkipWhitespace(s);
             if (s.Peek() == '\0')
                 break;
+            EXPECT_EQ(i, s.Tell());
             EXPECT_EQ('X', s.Take());
+            i += step;
+        }
     }
 }