From b255b7c6916b4cd069e6e807d952aae314e713d8 Mon Sep 17 00:00:00 2001
From: Scott Worley <scottworley@scottworley.com>
Date: Sun, 16 Jul 2023 22:46:07 -0700
Subject: [PATCH] Hands

---
 src/lib.rs | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/src/lib.rs b/src/lib.rs
index 4496f80..e2604dc 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -115,6 +115,27 @@ impl Library {
     }
 }
 
+#[cfg(test)]
+#[derive(Default)]
+struct Hand {
+    cards: Vec<Card>,
+}
+#[cfg(test)]
+impl Hand {
+    fn add(&mut self, card: Card) {
+        self.cards.push(card);
+    }
+    fn remove(&mut self, card: Card) -> Result<(), &'static str> {
+        let i = self
+            .cards
+            .iter()
+            .position(|&e| e == card)
+            .ok_or("That card is not in your hand")?;
+        self.cards.swap_remove(i);
+        Ok(())
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -161,4 +182,14 @@ mod tests {
         assert_eq!(lib.draw(&mut dis), Some(Card(8)));
         assert_eq!(lib.draw(&mut dis), None);
     }
+
+    #[test]
+    fn test_hand() {
+        let mut h = Hand::default();
+        assert!(h.remove(Card(4)).is_err());
+        h.add(Card(4));
+        assert!(h.remove(Card(3)).is_err());
+        assert!(h.remove(Card(4)).is_ok());
+        assert!(h.remove(Card(4)).is_err());
+    }
 }
-- 
2.44.1