1 files changed, 58 insertions, 0 deletions
diff --git a/library/std/src/path/tests.rs b/library/std/src/path/tests.rs
index 2bf499e1ab8..cf35254a2e3 100644
--- a/library/std/src/path/tests.rs
+++ b/library/std/src/path/tests.rs
@@ -1665,6 +1665,64 @@ fn test_ord() {
     ord!(Equal, "foo/bar", "foo/bar//");
 }
 
+#[test]
+#[cfg(unix)]
+fn test_unix_absolute() {
+    use crate::path::absolute;
+
+    assert!(absolute("").is_err());
+
+    let relative = "a/b";
+    let mut expected = crate::env::current_dir().unwrap();
+    expected.push(relative);
+    assert_eq!(absolute(relative).unwrap(), expected);
+
+    // Test how components are collected.
+    assert_eq!(absolute("/a/b/c").unwrap(), Path::new("/a/b/c"));
+    assert_eq!(absolute("/a//b/c").unwrap(), Path::new("/a/b/c"));
+    assert_eq!(absolute("//a/b/c").unwrap(), Path::new("//a/b/c"));
+    assert_eq!(absolute("///a/b/c").unwrap(), Path::new("/a/b/c"));
+    assert_eq!(absolute("/a/b/c/").unwrap(), Path::new("/a/b/c/"));
+    assert_eq!(absolute("/a/./b/../c/.././..").unwrap(), Path::new("/a/b/../c/../.."));
+}
+
+#[test]
+#[cfg(windows)]
+fn test_windows_absolute() {
+    use crate::path::absolute;
+    // An empty path is an error.
+    assert!(absolute("").is_err());
+
+    let relative = r"a\b";
+    let mut expected = crate::env::current_dir().unwrap();
+    expected.push(relative);
+    assert_eq!(absolute(relative).unwrap(), expected);
+
+    macro_rules! unchanged(
+        ($path:expr) => {
+            assert_eq!(absolute($path).unwrap(), Path::new($path));
+        }
+    );
+
+    unchanged!(r"C:\path\to\file");
+    unchanged!(r"C:\path\to\file\");
+    unchanged!(r"\\server\share\to\file");
+    unchanged!(r"\\server.\share.\to\file");
+    unchanged!(r"\\.\PIPE\name");
+    unchanged!(r"\\.\C:\path\to\COM1");
+    unchanged!(r"\\?\C:\path\to\file");
+    unchanged!(r"\\?\UNC\server\share\to\file");
+    unchanged!(r"\\?\PIPE\name");
+    // Verbatim paths are always unchanged, no matter what.
+    unchanged!(r"\\?\path.\to/file..");
+
+    assert_eq!(absolute(r"C:\path..\to.\file.").unwrap(), Path::new(r"C:\path..\to\file"));
+    assert_eq!(absolute(r"C:\path\to\COM1").unwrap(), Path::new(r"\\.\COM1"));
+    assert_eq!(absolute(r"C:\path\to\COM1.txt").unwrap(), Path::new(r"\\.\COM1"));
+    assert_eq!(absolute(r"C:\path\to\COM1  .txt").unwrap(), Path::new(r"\\.\COM1"));
+    assert_eq!(absolute(r"C:\path\to\cOnOuT$").unwrap(), Path::new(r"\\.\cOnOuT$"));
+}
+
 #[bench]
 fn bench_path_cmp_fast_path_buf_sort(b: &mut test::Bencher) {
     let prefix = "my/home";