30DaysOfTests: ffi:time returns correct time

src/ffi.rs

@@ -27,9 +27,21 @@ mod internal {
 pub fn time() -> time_t {
     let retrieved_time = unsafe { internal::time(ptr::null_mut()) };
 
-    if retrieved_time == (!0 as u32) {
+    if retrieved_time == !(0 as u32) {
         panic!("Could not get time from system");
     }
 
     retrieved_time
 }
+
+#[cfg(test)]
+mod test {
+    use ffi::time;
+
+    #[test]
+    fn test_time() {
+        let t_2030 = 1893456000;
+        let t = time();
+        assert!(t > 0 && t < t_2030);
+    }
+}