Updated 'src/automated_tests/howto.md'.

projects/rectangle/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "rectangle"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

projects/rectangle/src/lib.rs

@@ -0,0 +1,45 @@
+#[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)
+            || (self.width < other.height && self.height > other.width)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn larger_can_hold_smaller() {
+        let larger = Rectangle {
+            width: 8,
+            height: 7,
+        };
+        let smaller = Rectangle {
+            width: 5,
+            height: 1,
+        };
+
+        assert! (larger.can_hold(&smaller));
+    }
+
+    #[test]
+    fn smaller_cannot_hold_larger() {
+        let larger = Rectangle {
+            width: 8,
+            height: 7,
+        };
+        let smaller = Rectangle {
+            width: 5,
+            height: 1,
+        };
+
+        assert!(!smaller.can_hold(&larger));
+    }
+}

projects/rectangles/Cargo.toml

@@ -1,8 +0,0 @@
-[package]
-name = "rectangles"
-version = "0.1.0"
-edition = "2021"
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
-[dependencies]

projects/rectangles/src/main.rs

@@ -1,44 +0,0 @@
-#[derive(Debug)]
-struct Rectangle {
-    width: u32,
-    height: u32,
-}
-
-impl Rectangle {
-    fn area(&self) -> u32 {
-        self.width * self.height
-    }
-
-    fn can_hold(&self, other: &Rectangle) -> bool {
-        (self.width > other.width && self.height > other.height)
-            || (self.width > other.height && self.height > other.width)
-    }
-
-    fn square(size: u32) -> Self {
-        Self {
-            width: size,
-            height: size,
-        }
-    }
-}
-
-fn main() {
-    let rect1 = Rectangle {
-        width: 30,
-        height: 50,
-    };
-
-    let rect2 = Rectangle {
-        width: 10,
-        height: 40,
-    };
-
-    let rect3 = Rectangle {
-        width: 48,
-        height: 28,
-    };
-
-    println! ("rect1 可以容纳 rect2 吗？{}", rect1.can_hold(&rect2));
-    println! ("rect1 可以容纳 rect3 吗？{}", rect1.can_hold(&rect3));
-}
-