Update Exercises Directory Names to Reflect Order

exercises/17_tests/tests3.rs

@@ -0,0 +1,29 @@
+// tests3.rs
+//
+// This test isn't testing our function -- make it do that in such a way that
+// the test passes. Then write a second test that tests whether we get the
+// result we expect to get when we call `is_even(5)`.
+//
+// Execute `rustlings hint tests3` or use the `hint` watch subcommand for a
+// hint.
+
+// I AM NOT DONE
+
+pub fn is_even(num: i32) -> bool {
+    num % 2 == 0
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn is_true_when_even() {
+        assert!();
+    }
+
+    #[test]
+    fn is_false_when_odd() {
+        assert!();
+    }
+}