Clean up CPDF_FileSpec and add unit tests

Change implicit conversion to accessor function, remove unused function
and unused parameter, add a couple checks for null pointers, and some
cleanup.

BUG=pdfium:247
R=thestig@chromium.org

Review URL: https://codereview.chromium.org/1703183002 .

1 files changed, 5 insertions, 0 deletions

diff --git a/testing/test_support.h b/testing/test_support.h
index f135425b51..4b716ae772 100644
--- a/testing/test_support.h
+++ b/testing/test_support.h
@@ -47,6 +47,11 @@ struct DecodeTestData {
   unsigned int processed_size;
 };
 
+struct NullTermWstrFuncTestData {
+  const wchar_t* input;
+  const wchar_t* expected;
+};
+
 // Used with std::unique_ptr to free() objects that can't be deleted.
 struct FreeDeleter {
   inline void operator()(void* ptr) const { free(ptr); }