Add tests for GetNamedDests() API.

testing/resources/named_dests.in

Index: testing/resources/named_dests.in
diff --git a/testing/resources/named_dests.in b/testing/resources/named_dests.in
new file mode 100644
index 0000000000000000000000000000000000000000..8570fd6e0961c47dc503e30e341c5acdbbfd792d
--- /dev/null
+++ b/testing/resources/named_dests.in
@@ -0,0 +1,53 @@
+{{header}}
+{{object 1 0}} <<
+  /Type /Pages
+  /Count 1
+  /Kids [3 0 R]
+>>
+endobj
+{{object 2 0}} <<
+  /Type /Catalog
+  /Pages 1 0 R
+  /Names <<
+    /Dests 10 0 R
+  >>
+  /Dests 11 0 R
+>>
+endobj
+{{object 3 0}} <<
+  /Type /Page
+  /Parent 1 0 R
+  /Resources <<
+    /ProcSets [/PDF /Text /ImageB /ImageC /ImageI]
+  >>
+  /MediaBox [0 0 612 792]
+  /Contents 5 0 R
+>>
+endobj
+{{object 5 0}} <<
+  /Length 18
+>> stream
+1 0 0 -1 29 763 cm
+endstream
+endobj
+{{object 10 0}} <<
+  /Names [
+    /First [0 1 2 3]
+    /Next <</D [4 5 6 7]>>
+    /WrongType /NameNotAllowedHere
+    /WrongKey  <</Fail [10 11 12 13]>>
+  ]
+>>
+endobj
+{{object 11 0}} <<
+  /FirstAlternate [10 11 12 13]
+  /LastAlternate  <</D [14 15 16 17]>>
+>>
+endobj
+{{xref}}
+trailer <<
+  /Size 6
+  /Root 2 0 R
+>>
+{{startxref}}
+%%EOF