test: -o arg should trigger an error

src/uu/test/src/error.rs

@@ -11,6 +11,7 @@
     MissingArgument(String),
     UnknownOperator(String),
     InvalidInteger(String),
+    UnaryOperatorExpected(String),
 }
 
 /// A Result type for parsing test expressions
@@ -26,6 +27,7 @@
             Self::ExtraArgument(s) => write!(f, "extra argument {s}"),
             Self::UnknownOperator(s) => write!(f, "unknown operator {s}"),
             Self::InvalidInteger(s) => write!(f, "invalid integer {s}"),
+            Self::UnaryOperatorExpected(op) => write!(f, "{op}: unary operator expected"),
         }
     }
 }

src/uu/test/src/test.rs

@@ -162,6 +162,10 @@ fn eval(stack: &mut Vec<Symbol>) -> ParseResult<bool> {
         Some(Symbol::Literal(s)) => Ok(!s.is_empty()),
         Some(Symbol::None) | None => Ok(false),
         Some(Symbol::BoolOp(op)) => {
+            if (op == "-a" || op == "-o") && stack.len() < 2 {
+                return Err(ParseError::UnaryOperatorExpected(op.quote().to_string()));
+            }
+
             let b = eval(stack)?;
             let a = eval(stack)?;
 

tests/by-util/test_test.rs

@@ -67,7 +67,7 @@ fn test_double_not_is_false() {
 
 #[test]
 fn test_and_not_is_false() {
-    new_ucmd!().args(&["-a", "!"]).run().code_is(1);
+    new_ucmd!().args(&["-a", "!"]).run().code_is(2);
 }
 
 #[test]
@@ -86,6 +86,18 @@ fn test_simple_or() {
     new_ucmd!().args(&["foo", "-o", ""]).succeeds();
 }
 
+#[test]
+fn test_errors_miss_and_or() {
+    new_ucmd!()
+        .args(&["-o", "arg"])
+        .fails()
+        .stderr_contains("'-o': unary operator expected");
+    new_ucmd!()
+        .args(&["-a", "arg"])
+        .fails()
+        .stderr_contains("'-a': unary operator expected");
+}
+
 #[test]
 fn test_negated_or() {
     new_ucmd!()