path::normalize and //

[jesse99]

Posix pahs like "/foo//bar" should be normalized to "/foo/bar". (WIndows likely has similar issues). Here is a test case:

// rustc --test normalize.rs && ./normalize
use std;
use Path = path::Path;

macro_rules! assert_equal (($expected: expr, $actual: expr) => 
{
    let a = $actual;        // only evaluate the expressions once
    let e = $expected;
    if a != e
    {
        fail fmt!("Found '%?', but expected '%?'", a, e);
    }
})

// TODO: add a windows version of this
#[cfg(unix)]
fn root() -> Path
{
    path::from_str(~"/tmp/")
}

#[test]
fn tester()
{
    let path = root();
    let path = path.push("/hmm");
    let path = path.normalize();
    assert_equal!(~"/tmp/hmm", path.to_str());
}