Add some tests

Signed-off-by: Malhar Vora <mlvora.2010@gmail.com>

tests/by-util/test_getfacl.rs

@@ -3,9 +3,77 @@
 // For the full copyright and license information, please view the LICENSE
 // file that was distributed with this source code.
 
+use std::path::PathBuf;
+
+use pretty_assertions::assert_eq;
 use uutests::new_ucmd;
 
 #[test]
 fn test_invalid_arg() {
     new_ucmd!().arg("--definitely-invalid").fails().code_is(1);
 }
+
+#[test]
+fn test_basic_output_without_file() {
+    let res = new_ucmd!().succeeds();
+    let stdout = res.no_stderr().stdout_str();
+
+    // getfacl command shows no output if not given a file
+    assert_eq!(stdout.len(), 0);
+}
+
+#[test]
+fn test_basic_output_with_file() {
+    // Create basic file with default permissions. No ACLs.
+    let tmp_file = create_temp_file();
+    let res = new_ucmd!().arg(&tmp_file).succeeds();
+    let stdout = res.no_stderr().stdout_str();
+
+    assert!(stdout.contains(format!("# file: {}", &tmp_file.display()).as_str()));
+    assert!(stdout.contains("# owner:"));
+    assert!(stdout.contains("# group:"));
+    assert!(stdout.contains("user:"));
+    assert!(stdout.contains("group:"));
+    assert!(stdout.contains("other:"));
+
+    delete_file(&tmp_file)
+}
+
+#[test]
+fn test_basic_output_with_file_with_omit_header() {
+    // Create basic file with default permissions. No ACLs.
+    let tmp_file = create_temp_file();
+    let res = new_ucmd!().arg(&tmp_file).arg("-c").succeeds();
+    let stdout = res.no_stderr().stdout_str();
+
+    assert_eq!(
+        stdout.contains(format!("# file: {}", &tmp_file.display()).as_str()),
+        false
+    );
+    assert_eq!(stdout.contains("# owner:"), false);
+    assert_eq!(stdout.contains("# group:"), false);
+    assert!(stdout.contains("user:"));
+    assert!(stdout.contains("group:"));
+    assert!(stdout.contains("other:"));
+
+    delete_file(&tmp_file)
+}
+
+fn get_random_number() -> String {
+    std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .unwrap()
+        .subsec_nanos()
+        .to_string()
+}
+
+fn create_temp_file() -> PathBuf {
+    let tmp_dir = std::env::temp_dir();
+    let tmp_file = tmp_dir.join(format!("tmp_{}", get_random_number()));
+    std::fs::File::create(&tmp_file).unwrap();
+    tmp_file
+}
+
+fn delete_file(tmp_file: &PathBuf) {
+    std::fs::remove_file(tmp_file).unwrap();
+}