test: cfg2cmd: expect error for invalid volume's storage content type

Tests whether when running `config_to_command` it will correctly fail
with an error message that a volume cannot be used if the underlying
storage does not support its content type.

Signed-off-by: Daniel Kral <d.kral@proxmox.com>
[FE: add 'content' key to storage hash to be slightly more realistic]
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>

test/cfg2cmd/unsupported-storage-content-type.conf

@@ -0,0 +1,3 @@
+# TEST: Unsupported storage content type in a volume disk
+# EXPECT_ERROR: storage 'noimages' does not support content-type 'images'
+scsi0: noimages:8006/vm-8006-disk-0.raw,iothread=1,size=32G

test/run_config2command_tests.pl

@@ -31,6 +31,13 @@ my $base_env = {
 		type => 'dir',
 		shared => 0,
 	    },
+	    noimages => {
+		content => {
+		    iso => 1,
+		},
+		path => '/var/lib/vz',
+		type => 'dir',
+	    },
 	    'btrfs-store' => {
 		content => {
 		    images => 1,