random: add a commented-out test i used to run ENT

https://www.fourmilab.ch/random/

Entropy = 8.000000 bits per byte.

Optimum compression would reduce the size
of this 912444480 byte file by 0 percent.

Chi square distribution for 912444480 samples is 254.09, and randomly
would exceed this value 50.43 percent of the times.

Arithmetic mean value of data bytes is 127.4952 (127.5 = random).
Monte Carlo value for Pi is 3.141641048 (error 0.00 percent).
Serial correlation coefficient is 0.000022 (totally uncorrelated = 0.0).

src/random.rs

@@ -109,4 +109,20 @@ mod tests {
             set.insert(rand);
         }
     }
+
+    // I used this to perform statistical tests of the random generation function using ENT
+    // (https://fourmilab.ch/random/).
+    //#[test]
+    //fn write_to_file() {
+    //use std::io::Write;
+    //let mut f = std::fs::OpenOptions::new()
+    //.write(true)
+    //.create(true)
+    //.append(true)
+    //.open("random_out")
+    //.unwrap();
+    //for _ in 0..10_000_000 {
+    //f.write(&random_bytes().unwrap()).unwrap();
+    //}
+    //}
 }