Add API tests for NamedDestsByName, DestGetPageIndex.

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
new file mode 100644
index 0000000000000000000000000000000000000000..dadaf1d809f2638f5994dc6c342034419e27c32e
--- /dev/null
+++ b/fpdfsdk/src/fpdfdoc_embeddertest.cpp
@@ -0,0 +1,38 @@
+// Copyright 2015 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "../../testing/embedder_test.h"
+#include "../../fpdfsdk/include/fpdfview.h"
+#include "../../fpdfsdk/include/fpdfdoc.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+class FPDFDocEmbeddertest : public EmbedderTest {
+};
+
+TEST_F(FPDFDocEmbeddertest, DestGetPageIndex) {
+  EXPECT_TRUE(OpenDocument("testing/resources/named_dests.pdf"));
+
+  // NULL FPDF_DEST case.
+  EXPECT_EQ(0, FPDFDest_GetPageIndex(document(), nullptr));
+
+  // Page number directly in item from Dests NameTree.
+  FPDF_DEST dest = FPDF_GetNamedDestByName(document(), "First");
+  EXPECT_NE(nullptr, dest);
+  EXPECT_EQ(1, FPDFDest_GetPageIndex(document(), dest));
+
+  // Page number via object reference in item from Dests NameTree.
+  dest = FPDF_GetNamedDestByName(document(), "Next");
+  EXPECT_NE(nullptr, dest);
+  EXPECT_EQ(1, FPDFDest_GetPageIndex(document(), dest));
+
+  // Page number directly in item from Dests dictionary.
+  dest = FPDF_GetNamedDestByName(document(), "FirstAlternate");
+  EXPECT_NE(nullptr, dest);
+  EXPECT_EQ(11, FPDFDest_GetPageIndex(document(), dest));
+
+  // Invalid object reference in item from Dests NameTree.
+  dest = FPDF_GetNamedDestByName(document(), "LastAlternate");
+  EXPECT_NE(nullptr, dest);
+  EXPECT_EQ(0, FPDFDest_GetPageIndex(document(), dest));
+}