1 files changed, 40 insertions, 0 deletions
diff --git a/src/libcore/tests/fmt/mod.rs b/src/libcore/tests/fmt/mod.rs
new file mode 100644
index 00000000000..5d204c7d523
--- /dev/null
+++ b/src/libcore/tests/fmt/mod.rs
@@ -0,0 +1,40 @@
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+mod builders;
+mod float;
+mod num;
+
+#[test]
+fn test_format_flags() {
+    // No residual flags left by pointer formatting
+    let p = "".as_ptr();
+    assert_eq!(format!("{:p} {:x}", p, 16), format!("{:p} 10", p));
+
+    assert_eq!(format!("{: >3}", 'a'), "  a");
+}
+
+#[test]
+fn test_pointer_formats_data_pointer() {
+    let b: &[u8] = b"";
+    let s: &str = "";
+    assert_eq!(format!("{:p}", s), format!("{:p}", s.as_ptr()));
+    assert_eq!(format!("{:p}", b), format!("{:p}", b.as_ptr()));
+}
+
+#[test]
+fn test_estimated_capacity() {
+    assert_eq!(format_args!("").estimated_capacity(), 0);
+    assert_eq!(format_args!("{}", "").estimated_capacity(), 0);
+    assert_eq!(format_args!("Hello").estimated_capacity(), 5);
+    assert_eq!(format_args!("Hello, {}!", "").estimated_capacity(), 16);
+    assert_eq!(format_args!("{}, hello!", "World").estimated_capacity(), 0);
+    assert_eq!(format_args!("{}. 16-bytes piece", "World").estimated_capacity(), 32);
+}