tests ~ reorganize tests

tests/by-util/test_readlink.rs

@@ -0,0 +1,56 @@
+use crate::common::util::*;
+
+static GIBBERISH: &'static str = "supercalifragilisticexpialidocious";
+
+#[test]
+fn test_canonicalize() {
+    let (at, mut ucmd) = at_and_ucmd!();
+    let actual = ucmd.arg("-f").arg(".").run().stdout;
+    let expect = at.root_dir_resolved() + "\n";
+    println!("actual: {:?}", actual);
+    println!("expect: {:?}", expect);
+    assert_eq!(actual, expect);
+}
+
+#[test]
+fn test_canonicalize_existing() {
+    let (at, mut ucmd) = at_and_ucmd!();
+    let actual = ucmd.arg("-e").arg(".").run().stdout;
+    let expect = at.root_dir_resolved() + "\n";
+    println!("actual: {:?}", actual);
+    println!("expect: {:?}", expect);
+    assert_eq!(actual, expect);
+}
+
+#[test]
+fn test_canonicalize_missing() {
+    let (at, mut ucmd) = at_and_ucmd!();
+    let actual = ucmd.arg("-m").arg(GIBBERISH).run().stdout;
+    let expect = path_concat!(at.root_dir_resolved(), GIBBERISH) + "\n";
+    println!("actual: {:?}", actual);
+    println!("expect: {:?}", expect);
+    assert_eq!(actual, expect);
+}
+
+#[test]
+fn test_long_redirection_to_current_dir() {
+    let (at, mut ucmd) = at_and_ucmd!();
+    // Create a 256-character path to current directory
+    let dir = path_concat!(".", ..128);
+    let actual = ucmd.arg("-n").arg("-m").arg(dir).run().stdout;
+    let expect = at.root_dir_resolved();
+    println!("actual: {:?}", actual);
+    println!("expect: {:?}", expect);
+    assert_eq!(actual, expect);
+}
+
+#[test]
+fn test_long_redirection_to_root() {
+    // Create a 255-character path to root
+    let dir = path_concat!("..", ..85);
+    let actual = new_ucmd!().arg("-n").arg("-m").arg(dir).run().stdout;
+    let expect = get_root_path();
+    println!("actual: {:?}", actual);
+    println!("expect: {:?}", expect);
+    assert_eq!(actual, expect);
+}