Add bubble sort

sorting/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "sorting"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rand = "0.8.4"

sorting/src/lib.rs

@@ -0,0 +1,35 @@
+pub mod bubble_sort {
+    pub fn sort(vec: &mut Vec<usize>) {
+        for outer in (0..vec.len()).rev() {
+            for inner in 0..outer {
+                if vec[inner] > vec[inner + 1] {
+                    super::swap(vec, inner, inner + 1);
+                }
+            }
+        }
+    }
+}
+
+fn swap(vec: &mut Vec<usize>, index_one: usize, index_two: usize) {
+    let temp = vec[index_two];
+    vec[index_two] = vec[index_one];
+    vec[index_one] = temp;
+}
+
+#[cfg(test)]
+mod lib_tests {
+    use super::*;
+
+    #[test]
+    fn can_swap_numbers() {
+        // Arrange
+        let mut vec = vec![1, 2];
+
+        // Act
+        swap(&mut vec, 0, 1);
+
+        // Assert
+        assert_eq!(vec[0], 2);
+        assert_eq!(vec[1], 1);
+    }
+}

sorting/tests/integration_tests.rs

@@ -0,0 +1,18 @@
+use rand::seq::SliceRandom;
+use sorting;
+use rand::thread_rng;
+
+#[test]
+fn bubble_sort_ascending() {
+    // Arrange
+    let mut vec: Vec<usize> = (0..20).rev().collect();
+    vec.shuffle(&mut thread_rng());
+
+    // Act
+    sorting::bubble_sort::sort(&mut vec);
+
+    // Assert
+    for i in 0..20 {
+        assert_eq!(vec[i], i);
+    }
+}