boilerplate: add test boilerplate

boilerplate/src/main.rs

@@ -25,3 +25,23 @@ fn problem1<T: BufRead>(input: Lines<T>) -> u64 {
 fn problem2<T: BufRead>(input: Lines<T>) -> u64 {
     0
 }
+
+#[cfg(test)]
+mod tests {
+    use crate::*;
+    use std::io::Cursor;
+
+    const EXAMPLE: &str = &"";
+
+    #[test]
+    fn problem1_example() {
+        let c = Cursor::new(EXAMPLE);
+        assert_eq!(problem1(c.lines()), 0);
+    }
+
+    #[test]
+    fn problem2_example() {
+        let c = Cursor::new(EXAMPLE);
+        assert_eq!(problem2(c.lines()), 0);
+    }
+}