--- a/tests/test-dispatch.out
+++ b/tests/test-dispatch.out
@@ -1,4 +1,30 @@
adding a
+# missing arg
+hg cat: invalid arguments
+hg cat [OPTION]... FILE...
+
+output the current or given revision of files
+
+ Print the specified files as they were at the given revision.
+ If no revision is given, the parent of the working directory is used,
+ or tip if no revision is checked out.
+
+ Output may be to a file, in which case the name of the file is
+ given using a format string. The formatting rules are the same as
+ for the export command, with the following additions:
+
+ %s basename of file being printed
+ %d dirname of file being printed, or '.' if in repo root
+ %p root-relative path name of file being printed
+
+options:
+
+ -o --output print output to file with formatted name
+ -r --rev print the given revision
+ -I --include include names matching the given patterns
+ -X --exclude exclude names matching the given patterns
+
+use "hg -v help cat" to show global options
% [defaults]
a
a