diff --git a/single_file_tests/vec.rs b/single_file_tests/vec.rs
index 11e5a14..0594446 100644
--- a/single_file_tests/vec.rs
+++ b/single_file_tests/vec.rs
@@ -1,4 +1,7 @@
-use std::collections::BTreeMap;
+use std::collections::{
+    BTreeMap,
+    HashSet,
+};
 
 fn main() {
     let v = vec![1, 3, 5];
@@ -23,9 +26,34 @@ fn main() {
     let v4 = v3.iter().map(|&x| x * 2).collect::<Vec<_>>();
     println!("{:?} -> {:?}", v3, v4);
 
+    println!("To Set:");
+    let v5 = vec![1, 2, 3, 4];
+    let v_s: HashSet<usize> = v5.into_iter().collect();
+    println!("{:?}", v_s);
+
     println!("To Map:");
     let v = (0..5).collect::<Vec<i32>>();
     let m = v.iter().map(|i| (*i, i * 10)).collect::<BTreeMap<i32, i32>>();
     println!("{:?}", m);
+
+    println!("HashSet Union:");
+    let s_u_1 = vec![1, 2, 3].into_iter().collect::<HashSet<usize>>();
+    let s_u_2 = vec![4, 5, 6].into_iter().collect::<HashSet<usize>>();
+    println!("{:?}", s_u_1.union(&s_u_2));
+
+    println!("HashSet Difference:");
+    let s_d_1 = vec![1, 2, 3].into_iter().collect::<HashSet<usize>>();
+    let s_d_2 = vec![2, 3, 4].into_iter().collect::<HashSet<usize>>();
+    println!("{:?}", s_d_1.difference(&s_d_2));
+
+    println!("HashSet Intersection:");
+    let s_i_1 = vec![1, 2, 3].into_iter().collect::<HashSet<usize>>();
+    let s_i_2 = vec![2, 3, 4].into_iter().collect::<HashSet<usize>>();
+    println!("{:?}", s_i_1.intersection(&s_i_2));
+
+    println!("HashSet Symmetric Difference:");
+    let s_sd_1 = vec![1, 2, 3].into_iter().collect::<HashSet<usize>>();
+    let s_sd_2 = vec![2, 3, 4].into_iter().collect::<HashSet<usize>>();
+    println!("{:?}", s_sd_1.symmetric_difference(&s_sd_2));
 }