Update Exercises Directory Names to Reflect Order

exercises/17_tests/tests1.rs

@@ -0,0 +1,21 @@
+// tests1.rs
+//
+// Tests are important to ensure that your code does what you think it should
+// do. Tests can be run on this file with the following command: rustlings run
+// tests1
+//
+// This test has a problem with it -- make the test compile! Make the test pass!
+// Make the test fail!
+//
+// Execute `rustlings hint tests1` or use the `hint` watch subcommand for a
+// hint.
+
+// I AM NOT DONE
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn you_can_assert() {
+        assert!();
+    }
+}