Add test case for parsing endobj keywords.

testing/resources/pixel/endobj3.in

Index: testing/resources/pixel/endobj3.in
diff --git a/testing/resources/hello_world.in b/testing/resources/pixel/endobj3.in
similarity index 73%
copy from testing/resources/hello_world.in
copy to testing/resources/pixel/endobj3.in
index 19fce0ce335de77ea31e295a87025eb52f65110e..11f5a99480b5ceabdd0efcd3231e43f437de120a 100644
--- a/testing/resources/hello_world.in
+++ b/testing/resources/pixel/endobj3.in
@@ -34,19 +34,22 @@ endobj
   /BaseFont /Helvetica
 >>
 endobj
+% Case 3:
+%   /Length identifies intended end of stream, but whitespace rather than
+%   newline following the endstream keyword.
 {{object 6 0}} <<
+  /Length 97
 >>
 stream
 BT
 20 50 Td
 /F1 12 Tf
-(Hello, world!) Tj
+(endobj is text) Tj
 0 50 Td
-/F2 16 Tf
-(Goodbye, world!) Tj
+/F2 13 Tf
+(endstream is text per /Length) Tj
 ET
-endstream
-endobj
+endstream endobj
 {{xref}}
 trailer <<
   /Size 6