First commit

exercises/17_tests/tests1.rs

@@ -0,0 +1,23 @@
+// 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() {
+    // You can optionally experiment here.
+}
+
+#[cfg(test)]
+mod tests {
+    // TODO: Import `is_even`. You can use a wildcard to import everything in
+    // the outer module.
+
+    #[test]
+    fn you_can_assert() {
+        // TODO: Test the function `is_even` with some values.
+        assert!();
+        assert!();
+    }
+}