testsuite: Check cmdline for multiple blacklist

Make sure this (undocumented) behavior doesn't change in future.
Multiple blacklist append to the config.

Signed-off-by: Lucas De Marchi <[email protected]>
Reviewed-by: Emil Velikov <[email protected]>
Link: #254

testsuite/rootfs-pristine/test-modprobe/module-param-kcmdline9/correct.txt

@@ -0,0 +1,8 @@
+blacklist foo
+blacklist bar
+blacklist foo2
+blacklist bar2
+blacklist foobar
+
+# End of configuration files. Dumping indexes now:
+

testsuite/rootfs-pristine/test-modprobe/module-param-kcmdline9/proc/cmdline

@@ -0,0 +1 @@
+modprobe.blacklist=foo,bar modprobe.blacklist=foo2 quiet modprobe.blacklist=bar2 rw modprobe.blacklist=foobar

testsuite/test-modprobe.c

@@ -258,6 +258,16 @@ DEFINE_TEST_WITH_FUNC(modprobe_param_kcmdline8, modprobe_param_kcmdline,
 	},
 	.output = {
 		.out = TESTSUITE_ROOTFS "test-modprobe/module-param-kcmdline8/correct.txt",
+	});
+
+DEFINE_TEST_WITH_FUNC(modprobe_param_kcmdline9, modprobe_param_kcmdline,
+	.description = "check if multiple blacklists are parsed correctly",
+	.config = {
+		[TC_UNAME_R] = "4.4.4",
+		[TC_ROOTFS] = TESTSUITE_ROOTFS "test-modprobe/module-param-kcmdline9",
+	},
+	.output = {
+		.out = TESTSUITE_ROOTFS "test-modprobe/module-param-kcmdline9/correct.txt",
 	},
 	.modules_loaded = "",
 	);