100 exercises to learn Rust

exercises/06_ticket_management/03_resizing/Cargo.toml

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+[package]
+name = "resizing"
+version = "0.1.0"
+edition = "2021"

exercises/06_ticket_management/03_resizing/src/lib.rs

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+#[cfg(test)]
+mod tests {
+    #[test]
+    fn resizing() {
+        let mut v = Vec::with_capacity(2);
+        v.push(1);
+        v.push(2); // max capacity reached
+        assert_eq!(v.capacity(), 2);
+
+        v.push(3); // beyond capacity, needs to resize
+
+        // Can you guess what the new capacity will be?
+        // Beware that the standard library makes no guarantees about the
+        // algorithm used to resize the vector, so this may change in the future.
+        assert_eq!(v.capacity(), todo!());
+    }
+}