1 files changed, 23 insertions, 0 deletions
diff --git a/src/doc/book/listings/ch11-writing-automated-tests/listing-11-11/src/lib.rs b/src/doc/book/listings/ch11-writing-automated-tests/listing-11-11/src/lib.rs
new file mode 100644
index 000000000..f56715263
--- /dev/null
+++ b/src/doc/book/listings/ch11-writing-automated-tests/listing-11-11/src/lib.rs
@@ -0,0 +1,23 @@
+pub fn add_two(a: i32) -> i32 {
+    a + 2
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn add_two_and_two() {
+        assert_eq!(4, add_two(2));
+    }
+
+    #[test]
+    fn add_three_and_two() {
+        assert_eq!(5, add_two(3));
+    }
+
+    #[test]
+    fn one_hundred() {
+        assert_eq!(102, add_two(100));
+    }
+}