test(mangen): Add test for flatten_help

This test shows that the output stays the same independent of the value
of `flatten_help`. Further commits may implement `flatten_help` for
`clap_mangen`.

Signed-off-by: Paul Spooren <mail@aparcar.org>

Author: aparcar

clap_mangen/tests/snapshots/flatten_help.roff

@@ -0,0 +1,26 @@
+.ie \n(.g .ds Aq \(aq
+.el .ds Aq '
+.TH my-app 1  "my-app " 
+.SH NAME
+my\-app
+.SH SYNOPSIS
+\fBmy\-app\fR [\fB\-c \fR] [\fB\-v \fR] [\fB\-h\fR|\fB\-\-help\fR] [\fIsubcommands\fR]
+.SH DESCRIPTION
+.SH OPTIONS
+.TP
+\fB\-c\fR
+
+.TP
+\fB\-v\fR
+
+.TP
+\fB\-h\fR, \fB\-\-help\fR
+Print help
+.SH SUBCOMMANDS
+.TP
+my\-app\-test(1)
+Subcommand
+with a second line
+.TP
+my\-app\-help(1)
+Print this message or the help of the given subcommand(s)

clap_mangen/tests/testsuite/roff.rs

@@ -105,3 +105,17 @@ fn value_name_without_arg() {
         cmd,
     );
 }
+
+#[test]
+fn flatten_help_false() {
+    let name = "my-app";
+    let cmd = common::basic_command(name).flatten_help(false);
+    common::assert_matches(snapbox::file!["../snapshots/basic.bash.roff"], cmd);
+}
+
+#[test]
+fn flatten_help_true() {
+    let name = "my-app";
+    let cmd = common::basic_command(name).flatten_help(true);
+    common::assert_matches(snapbox::file!["../snapshots/flatten_help.roff"], cmd);
+}