tests: Add tests for new --help

This commit is a part of "--help me if you can"

Closes #5680

tests/data/test1461

@@ -0,0 +1,53 @@
+<testcase>
+<info>
+<keywords>
+--help
+</keywords>
+</info>
+
+#
+# Server-side
+<reply>
+</reply>
+
+#
+# Client-side
+<client>
+<server>
+none
+</server>
+ <name>
+curl important --help
+ </name>
+ <command>
+--help
+</command>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<errorcode>
+0
+</errorcode>
+<stdout mode="text">
+Usage: curl [options...] <url>
+ -d, --data <data>   HTTP POST data
+ -f, --fail          Fail silently (no output at all) on HTTP errors
+ -h, --help <category> Get help for commands
+ -i, --include       Include protocol response headers in the output
+ -o, --output <file> Write to file instead of stdout
+ -O, --remote-name   Write output to a file named as the remote file
+ -s, --silent        Silent mode
+ -T, --upload-file <file> Transfer local FILE to destination
+ -u, --user <user:password> Server user and password
+ -A, --user-agent <name> Send User-Agent <name> to server
+ -v, --verbose       Make the operation more talkative
+ -V, --version       Show version number and quit
+
+This is not the full help, this menu is stripped into categories.
+Use "--help category" to get an overview of all categories.
+For all options use the manual or "--help all".
+</stdout>
+</verify>
+</testcase>