added tests comment

src/main.rs

@@ -12,8 +12,8 @@ impl Rng {
             .unwrap()
             .subsec_nanos() as u64;
         // Allegedly
-        // It's XOR'd with the seed (`subsec_nanos()`) as a **mixing step** —
-        // the golden ratio has a property where it distributes bits very evenly across
+        // The magic number is XOR'd with the seed (`subsec_nanos()`) as a mixing step.
+        // "the golden ratio" has a property where it distributes bits very evenly across
         // the range, so even a low-entropy seed gets spread across all 64 bits
         // before the first LCG iteration runs
         Self {
@@ -205,3 +205,16 @@ fn print_summary(stats: &[QuestionStats]) {
     );
     println!("\nScore: {}/{}", perfect, stats.len());
 }
+
+// tests
+// * valid integer
+// * some basic correctness of correct answers
+// * some basic correctness of incorrect answers
+//
+// * invalid integer
+// * float
+// * different representation: hex, binary, octect
+// * unicode
+// * some specific attacks
+// * multiple integers
+//