whitelist fallback typefaces

tests/StringTest.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include <stdarg.h>
 #include <stdio.h>
 #include "SkString.h"
@@ skipping 167 matching lines @@
     char buffer [40];
     memset(buffer, 'a', 40);
     REPORTER_ASSERT(reporter, buffer[18] == 'a');
     REPORTER_ASSERT(reporter, buffer[19] == 'a');
     REPORTER_ASSERT(reporter, buffer[20] == 'a');
     printfAnalog(buffer, 20, "%30d", 0);
     REPORTER_ASSERT(reporter, buffer[18] == ' ');
     REPORTER_ASSERT(reporter, buffer[19] == 0);
     REPORTER_ASSERT(reporter, buffer[20] == 'a');
 
+    SkString h("b");
+    for (int i = 2; i < 10; ++i) {
+        h.resize(i);
+        char* writeChar = h.writable_str() + i - 1;
+        *writeChar = (char) ('a' + i);
+        REPORTER_ASSERT(reporter, !strncmp("bcdefghijk", h.c_str(), i));
+    }
 }
 
 DEF_TEST(String_SkStrSplit, r) {
     SkTArray<SkString> results;
 
     SkStrSplit("a-_b_c-dee--f-_-_-g-", "-_", &results);
     REPORTER_ASSERT(r, results.count() == 6);
     REPORTER_ASSERT(r, results[0].equals("a"));
     REPORTER_ASSERT(r, results[1].equals("b"));
     REPORTER_ASSERT(r, results[2].equals("c"));
     REPORTER_ASSERT(r, results[3].equals("dee"));
     REPORTER_ASSERT(r, results[4].equals("f"));
     REPORTER_ASSERT(r, results[5].equals("g"));
 }