tests ~ reorganize tests

tests/by-util/test_uname.rs

@@ -0,0 +1,27 @@
+use crate::common::util::*;
+
+#[test]
+fn test_uname_compatible() {
+    let (_, mut ucmd) = at_and_ucmd!();
+
+    let result = ucmd.arg("-a").run();
+    assert!(result.success);
+}
+
+#[test]
+fn test_uname_name() {
+    let (_, mut ucmd) = at_and_ucmd!();
+
+    let result = ucmd.arg("-n").run();
+    assert!(result.success);
+}
+
+#[test]
+fn test_uname_kernel() {
+    let (_, mut ucmd) = at_and_ucmd!();
+
+    let result = ucmd.arg("-o").run();
+    assert!(result.success);
+    #[cfg(target_os = "linux")]
+    assert!(result.stdout.to_lowercase().contains("linux"));
+}