tests: move tests to tests/ directory and give the user cgroup perms

Signed-off-by: Levente Kurusa <lkurusa@acm.org>

tests/resources.rs

@@ -0,0 +1,26 @@
+//! Integration test about setting resources using `apply()`
+extern crate cgroups;
+
+use cgroups::{Cgroup, Resources, PidResources};
+use cgroups::pid::{PidController, PidMax};
+
+#[test]
+fn pid_resources() {
+    let hier = cgroups::hierarchies::V1::new();
+    let cg = Cgroup::new(&hier, String::from("pid_resources"));
+    {
+        let res = Resources {
+            pid: PidResources {
+                update_values: true,
+                maximum_number_of_processes: PidMax::Value(512),
+            },
+            ..Default::default()
+        };
+        cg.apply(&res);
+
+        /* verify */
+        let pidcontroller: &PidController = cg.controller_of().unwrap();
+        assert_eq!(pidcontroller.get_pid_max(), Some(PidMax::Value(512)));
+    }
+    cg.delete();
+}