Update tests.

tests/tuple.rs

@@ -61,4 +61,7 @@ fn show() {
     show!(((1, 2), (3, 4)));
     show!(());
     show!((1, 2, 3), (4, 5, 6), (7, 8, 9));
+    let mut buf = Vec::new();
+    show!((1, 2, 3), (4, 5, 6), (7, 8, 9); buf = &mut buf);
+    assert_eq!(String::from_utf8(buf).unwrap(), "1 2 3 4 5 6 7 8 9\n");
 }

tests/vec.rs

@@ -85,6 +85,15 @@ fn read_n_from_str_err() {
     let _: Vec<u32> = reader.read_n(3);
 }
 
+#[test]
+#[should_panic = "invalid digit found in string"]
+fn read_from_str_err() {
+    let reader = Cursor::new("1 -2 -3".as_bytes());
+    let mut reader = InputStream::new(reader);
+
+    let _: Vec<u32> = reader.read();
+}
+
 #[test]
 fn read_char_3() {
     let reader = Cursor::new("1 2 3".as_bytes());