cut: rename some tests

tests/by-util/test_cut.rs

@@ -47,7 +47,7 @@ static COMPLEX_SEQUENCE: &TestedSequence = &TestedSequence {
 };
 
 #[test]
-fn test_no_argument() {
+fn test_no_args() {
     new_ucmd!().fails().stderr_is(
         "cut: invalid usage: expects one of --fields (-f), --chars (-c) or --bytes (-b)\n",
     );
@@ -256,7 +256,7 @@ fn test_no_such_file() {
 }
 
 #[test]
-fn test_equal_as_delimiter1() {
+fn test_equal_as_delimiter() {
     new_ucmd!()
         .args(&["-f", "2", "-d="])
         .pipe_in("--dir=./out/lib")
@@ -265,7 +265,7 @@ fn test_equal_as_delimiter1() {
 }
 
 #[test]
-fn test_equal_as_delimiter2() {
+fn test_empty_string_as_delimiter() {
     new_ucmd!()
         .args(&["-f2", "--delimiter="])
         .pipe_in("a=b\n")
@@ -274,7 +274,7 @@ fn test_equal_as_delimiter2() {
 }
 
 #[test]
-fn test_equal_as_delimiter3() {
+fn test_empty_string_as_delimiter_with_output_delimiter() {
     new_ucmd!()
         .args(&["-f", "1,2", "-d", "''", "--output-delimiter=Z"])
         .pipe_in("ab\0cd\n")
@@ -283,7 +283,7 @@ fn test_equal_as_delimiter3() {
 }
 
 #[test]
-fn test_newline_delimited() {
+fn test_newline_as_delimiter() {
     new_ucmd!()
         .args(&["-f", "1", "-d", "\n"])
         .pipe_in("a:1\nb:")
@@ -292,7 +292,7 @@ fn test_newline_delimited() {
 }
 
 #[test]
-fn test_multiple() {
+fn test_multiple_delimiters() {
     new_ucmd!()
         .args(&["-f2", "-d:", "-d="])
         .pipe_in("a=b\n")