I added the following additional change to make understanding the
code a little easier:
diff --git a/tests/data/sack.c b/tests/data/sack.c
index ace153c..a5550a7 100644
--- a/tests/data/sack.c
+++ b/tests/data/sack.c
@@ -284,6 +284,12 @@ stdout. A data item is one of the following\n\
optionally followed by an asterisk and a positive integer, which\n\
specifies a repeat count for the data item.\n\
\n\
+Comments are introduced by # (outside a quoted string) and continue\n\
+to the end of the line. The characters > and < are also treated as\n\
+comments; the negative tests in the testsuite use these to point out\n\
+the parts of input that are actually invalid; e.g. >>4<< if the number\n\
+4 is invalid input.\n\
+\n\
The md5sum of the data written to stdout is written to stderr as\n\
16 hexadecimal digits followed by a new-line.\n",
program_name, program_name);
diff --git a/tests/data/sys-file-reader.at b/tests/data/sys-file-reader.at
index c204a55..6f8e8fb 100644
--- a/tests/data/sys-file-reader.at
+++ b/tests/data/sys-file-reader.at
@@ -1,3 +1,6 @@
+dnl Read the output of "sack --help" to understand the input files
+dnl used in these tests.
+
AT_BANNER([system file reader - positive])
AT_SETUP([variable labels and missing values])
--
Ben Pfaff
http://benpfaff.org
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