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diff --git a/exercises/quiz3.rs b/exercises/quiz3.rs
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+// quiz.rs
+// This is a quiz for the following sections:
+// - Tests
+
+// This quiz isn't testing our function -- make it do that in such a way that
+// the test passes. Then write a second test that tests that we get the result
+// we expect to get when we call `times_two` with a negative number.
+// No hints, you can do this :)
+
+// I AM NOT DONE
+
+pub fn times_two(num: i32) -> i32 {
+    num * 2
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn returns_twice_of_positive_numbers() {
+        assert_eq!(times_two(4), ???);
+    }
+
+    #[test]
+    fn returns_twice_of_negative_numbers() {
+        // TODO write an assert for `times_two(-4)`
+    }
+}