Add unit test for top-level bookmarks.

fpdfsdk/src/fpdfdoc_embeddertest.cpp

Index: fpdfsdk/src/fpdfdoc_embeddertest.cpp
diff --git a/fpdfsdk/src/fpdfdoc_embeddertest.cpp b/fpdfsdk/src/fpdfdoc_embeddertest.cpp
index 8b1c4fb3e83dc84c0e6c2f5d9e1c5a2d87ee0086..c83b2eb958b3edb361492d3d114da672fb4d26a6 100644
--- a/fpdfsdk/src/fpdfdoc_embeddertest.cpp
+++ b/fpdfsdk/src/fpdfdoc_embeddertest.cpp
@@ -2,9 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "../../core/include/fxcrt/fx_string.h"
 #include "../../public/fpdf_doc.h"
 #include "../../public/fpdfview.h"
 #include "../../testing/embedder_test.h"
+#include "../../testing/fx_string_testhelpers.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 class FPDFDocEmbeddertest : public EmbedderTest {};
@@ -60,3 +62,40 @@ TEST_F(FPDFDocEmbeddertest, ActionGetFilePath) {
 
   FPDF_ClosePage(page);
 }
+
+TEST_F(FPDFDocEmbeddertest, NoBookmarks) {
+  // Open a file with no bookmarks.
+  EXPECT_TRUE(OpenDocument("testing/resources/named_dests.pdf"));
+
+  // The non-existent top-level bookmark has no title.
+  unsigned short buf[128];
+  EXPECT_EQ(0, FPDFBookmark_GetTitle(nullptr, buf, sizeof(buf)));
+
+  // The non-existent top-level bookmark has no children.
+  EXPECT_EQ(nullptr, FPDFBookmark_GetFirstChild(document(), nullptr));
+}
+
+TEST_F(FPDFDocEmbeddertest, Bookmarks) {
+  // Open a file with two bookmarks.
+  EXPECT_TRUE(OpenDocument("testing/resources/bookmarks.pdf"));
+
+  // The existent top-level bookmark has no title.
+  unsigned short buf[128];
+  EXPECT_EQ(0, FPDFBookmark_GetTitle(nullptr, buf, sizeof(buf)));
+
+  FPDF_BOOKMARK child = FPDFBookmark_GetFirstChild(document(), nullptr);
+  EXPECT_NE(nullptr, child);
+  EXPECT_EQ(34, FPDFBookmark_GetTitle(child, buf, sizeof(buf)));
+  EXPECT_EQ(CFX_WideString(L"A Good Beginning"),
+            CFX_WideString::FromUTF16LE(buf, 16));
+
+  EXPECT_EQ(nullptr, FPDFBookmark_GetFirstChild(document(), child));
+
+  FPDF_BOOKMARK sibling = FPDFBookmark_GetNextSibling(document(), child);
+  EXPECT_NE(nullptr, sibling);
+  EXPECT_EQ(28, FPDFBookmark_GetTitle(sibling, buf, sizeof(buf)));
+  EXPECT_EQ(CFX_WideString(L"A Good Ending"),
+            CFX_WideString::FromUTF16LE(buf, 13));
+
+  EXPECT_EQ(nullptr, FPDFBookmark_GetNextSibling(document(), sibling));
+}