1 files changed, 51 insertions, 0 deletions
diff --git a/rust/theBook/chapter-11-writing-automated-tests/adder/src/lib.rs b/rust/theBook/chapter-11-writing-automated-tests/adder/src/lib.rs
new file mode 100644
index 0000000..55c024c
--- /dev/null
+++ b/rust/theBook/chapter-11-writing-automated-tests/adder/src/lib.rs
@@ -0,0 +1,51 @@
+#[derive(Debug)]
+struct Rectangle {
+    width: u32,
+    height: u32,
+}
+
+impl Rectangle {
+    fn can_hold(&self, other: &Rectangle) -> bool {
+        self.width >= other.width && self.height >= other.height
+    }
+}
+
+pub fn greeting(name: &str) -> String {
+    format!("hello {}!", name)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn exception() {
+        let result = 2+2;
+        assert_eq!(result, 4);
+    }
+    #[test]
+    fn another() {
+        println!("this one will fail");
+    }
+
+    #[test]
+    fn hold() {
+        let larger = Rectangle {
+            width: 7,
+            height: 8,
+        };
+        
+        let smaller = Rectangle {
+            width: 5,
+            height: 4,
+        };
+
+        assert!(larger.can_hold(&smaller));
+    }
+
+    #[test]
+    fn greeting_contain_names() {
+        let result = greeting("caol");
+        assert!(result.contains("carol"), "gretting did not contain name, the value is {}", result);
+    }
+}