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kanashiro-guest pushed a commit to branch master
in repository carton.

commit 7d748501504db75b41f01f793fa2681813b8e5af
Author: Tatsuhiko Miyagawa <miyag...@bulknews.net>
Date:   Sat Jun 8 14:27:00 2013 -0700

    carton exec without an argument should die
---
 lib/Carton/CLI.pm |  4 ++++
 xt/cli/exec.t     | 17 +++++++++++++----
 2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/lib/Carton/CLI.pm b/lib/Carton/CLI.pm
index e91aec4..3da3b54 100644
--- a/lib/Carton/CLI.pm
+++ b/lib/Carton/CLI.pm
@@ -357,6 +357,10 @@ sub cmd_exec {
 
     $self->parse_options_pass_through(\@args, 'I=s@', sub { die "exec -Ilib is 
deprecated.\n" });
 
+    unless (@args) {
+        $self->error("carton exec needs a command to run.");
+    }
+
     # PERL5LIB takes care of arch
     my $path = $self->install_path;
     local $ENV{PERL5LIB} = "$path/lib/perl5";
diff --git a/xt/cli/exec.t b/xt/cli/exec.t
index b56b241..f1487af 100644
--- a/xt/cli/exec.t
+++ b/xt/cli/exec.t
@@ -2,14 +2,23 @@ use strict;
 use Test::More;
 use xt::CLI;
 
-{
+subtest 'carton exec without a command', sub {
+    my $app = cli();
+    $app->write_cpanfile('');
+    $app->run("install");
+    $app->run("exec");
+    like $app->stderr, qr/carton exec needs a command/;
+    is $app->exit_code, 255;
+};
+
+subtest 'exec without a lock', sub {
     my $app = cli();
     $app->run("exec", "perl", "-e", 1);
     like $app->stderr, qr/carton\.lock/;
     is $app->exit_code, 255;
-}
+};
 
-{
+subtest 'carton exec', sub {
     my $app = cli();
     $app->write_cpanfile('');
     $app->run("install");
@@ -44,7 +53,7 @@ EOF
     $app->run("exec", "--", "mojo", "version");
 
     like $app->stdout, qr/Mojolicious \(4\.01/;
-}
+};
 
 done_testing;
 

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