1 files changed, 11 insertions, 0 deletions
diff --git a/src/doc/book/listings/ch11-writing-automated-tests/no-listing-10-result-in-tests/src/lib.rs b/src/doc/book/listings/ch11-writing-automated-tests/no-listing-10-result-in-tests/src/lib.rs
new file mode 100644
index 000000000..6284f4f29
--- /dev/null
+++ b/src/doc/book/listings/ch11-writing-automated-tests/no-listing-10-result-in-tests/src/lib.rs
@@ -0,0 +1,11 @@
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn it_works() -> Result<(), String> {
+        if 2 + 2 == 4 {
+            Ok(())
+        } else {
+            Err(String::from("two plus two does not equal four"))
+        }
+    }
+}