From 54731f0fc0b0fde18438853c0a8abaa968edb57a Mon Sep 17 00:00:00 2001
From: Hunter Kvalevog <hunter@kvog.sh>
Date: Sun, 27 Sep 2026 16:34:25 -0500
Subject: rustlings: complete 17

---
 rustlings/solutions/17_tests/tests1.rs | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

(limited to 'rustlings/solutions/17_tests/tests1.rs')

diff --git a/rustlings/solutions/17_tests/tests1.rs b/rustlings/solutions/17_tests/tests1.rs
index dcf2377..c52b8b1 100644
--- a/rustlings/solutions/17_tests/tests1.rs
+++ b/rustlings/solutions/17_tests/tests1.rs
@@ -1,4 +1,24 @@
+// Tests are important to ensure that your code does what you think it should
+// do.
+
+fn is_even(n: i64) -> bool {
+    n % 2 == 0
+}
+
 fn main() {
-    // DON'T EDIT THIS SOLUTION FILE!
-    // It will be automatically filled after you finish the exercise.
+    // You can optionally experiment here.
+}
+
+#[cfg(test)]
+mod tests {
+    // When writing unit tests, it is common to import everything from the outer
+    // module (`super`) using a wildcard.
+    use super::*;
+
+    #[test]
+    fn you_can_assert() {
+        assert!(is_even(0));
+        assert!(!is_even(-1));
+        //      ^ You can assert `false` using the negation operator `!`.
+    }
 }
-- 
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