diff --git a/tests/by-util/test_seq.rs b/tests/by-util/test_seq.rs
index 62a0212b1..730a9571d 100644
--- a/tests/by-util/test_seq.rs
+++ b/tests/by-util/test_seq.rs
@@ -303,18 +303,15 @@ fn test_preserve_negative_zero_start() {
     new_ucmd!()
         .args(&["-0", "1"])
         .succeeds()
-        .stdout_is("-0\n1\n")
-        .no_stderr();
+        .stdout_only("-0\n1\n");
     new_ucmd!()
         .args(&["-0", "1", "2"])
         .succeeds()
-        .stdout_is("-0\n1\n2\n")
-        .no_stderr();
+        .stdout_only("-0\n1\n2\n");
     new_ucmd!()
         .args(&["-0", "1", "2.0"])
         .succeeds()
-        .stdout_is("-0\n1\n2\n")
-        .no_stderr();
+        .stdout_only("-0\n1\n2\n");
 }
 
 #[test]
@@ -322,8 +319,7 @@ fn test_drop_negative_zero_end() {
     new_ucmd!()
         .args(&["1", "-1", "-0"])
         .succeeds()
-        .stdout_is("1\n0\n")
-        .no_stderr();
+        .stdout_only("1\n0\n");
 }
 
 #[test]
@@ -331,13 +327,11 @@ fn test_width_scientific_notation() {
     new_ucmd!()
         .args(&["-w", "999", "1e3"])
         .succeeds()
-        .stdout_is("0999\n1000\n")
-        .no_stderr();
+        .stdout_only("0999\n1000\n");
     new_ucmd!()
         .args(&["-w", "999", "1E3"])
         .succeeds()
-        .stdout_is("0999\n1000\n")
-        .no_stderr();
+        .stdout_only("0999\n1000\n");
 }
 
 #[test]
@@ -345,18 +339,15 @@ fn test_width_negative_zero() {
     new_ucmd!()
         .args(&["-w", "-0", "1"])
         .succeeds()
-        .stdout_is("-0\n01\n")
-        .no_stderr();
+        .stdout_only("-0\n01\n");
     new_ucmd!()
         .args(&["-w", "-0", "1", "2"])
         .succeeds()
-        .stdout_is("-0\n01\n02\n")
-        .no_stderr();
+        .stdout_only("-0\n01\n02\n");
     new_ucmd!()
         .args(&["-w", "-0", "1", "2.0"])
         .succeeds()
-        .stdout_is("-0\n01\n02\n")
-        .no_stderr();
+        .stdout_only("-0\n01\n02\n");
 }
 
 #[test]
@@ -364,33 +355,27 @@ fn test_width_negative_zero_decimal_notation() {
     new_ucmd!()
         .args(&["-w", "-0.0", "1"])
         .succeeds()
-        .stdout_is("-0.0\n01.0\n")
-        .no_stderr();
+        .stdout_only("-0.0\n01.0\n");
     new_ucmd!()
         .args(&["-w", "-0.0", "1.0"])
         .succeeds()
-        .stdout_is("-0.0\n01.0\n")
-        .no_stderr();
+        .stdout_only("-0.0\n01.0\n");
     new_ucmd!()
         .args(&["-w", "-0.0", "1", "2"])
         .succeeds()
-        .stdout_is("-0.0\n01.0\n02.0\n")
-        .no_stderr();
+        .stdout_only("-0.0\n01.0\n02.0\n");
     new_ucmd!()
         .args(&["-w", "-0.0", "1", "2.0"])
         .succeeds()
-        .stdout_is("-0.0\n01.0\n02.0\n")
-        .no_stderr();
+        .stdout_only("-0.0\n01.0\n02.0\n");
     new_ucmd!()
         .args(&["-w", "-0.0", "1.0", "2"])
         .succeeds()
-        .stdout_is("-0.0\n01.0\n02.0\n")
-        .no_stderr();
+        .stdout_only("-0.0\n01.0\n02.0\n");
     new_ucmd!()
         .args(&["-w", "-0.0", "1.0", "2.0"])
         .succeeds()
-        .stdout_is("-0.0\n01.0\n02.0\n")
-        .no_stderr();
+        .stdout_only("-0.0\n01.0\n02.0\n");
 }
 
 #[test]
@@ -398,98 +383,80 @@ fn test_width_negative_zero_scientific_notation() {
     new_ucmd!()
         .args(&["-w", "-0e0", "1"])
         .succeeds()
-        .stdout_is("-0\n01\n")
-        .no_stderr();
+        .stdout_only("-0\n01\n");
     new_ucmd!()
         .args(&["-w", "-0e0", "1", "2"])
         .succeeds()
-        .stdout_is("-0\n01\n02\n")
-        .no_stderr();
+        .stdout_only("-0\n01\n02\n");
     new_ucmd!()
         .args(&["-w", "-0e0", "1", "2.0"])
         .succeeds()
-        .stdout_is("-0\n01\n02\n")
-        .no_stderr();
+        .stdout_only("-0\n01\n02\n");
 
     new_ucmd!()
         .args(&["-w", "-0e+1", "1"])
         .succeeds()
-        .stdout_is("-00\n001\n")
-        .no_stderr();
+        .stdout_only("-00\n001\n");
     new_ucmd!()
         .args(&["-w", "-0e+1", "1", "2"])
         .succeeds()
-        .stdout_is("-00\n001\n002\n")
-        .no_stderr();
+        .stdout_only("-00\n001\n002\n");
     new_ucmd!()
         .args(&["-w", "-0e+1", "1", "2.0"])
         .succeeds()
-        .stdout_is("-00\n001\n002\n")
-        .no_stderr();
+        .stdout_only("-00\n001\n002\n");
 
     new_ucmd!()
         .args(&["-w", "-0.000e0", "1"])
         .succeeds()
-        .stdout_is("-0.000\n01.000\n")
-        .no_stderr();
+        .stdout_only("-0.000\n01.000\n");
     new_ucmd!()
         .args(&["-w", "-0.000e0", "1", "2"])
         .succeeds()
-        .stdout_is("-0.000\n01.000\n02.000\n")
-        .no_stderr();
+        .stdout_only("-0.000\n01.000\n02.000\n");
     new_ucmd!()
         .args(&["-w", "-0.000e0", "1", "2.0"])
         .succeeds()
-        .stdout_is("-0.000\n01.000\n02.000\n")
-        .no_stderr();
+        .stdout_only("-0.000\n01.000\n02.000\n");
 
     new_ucmd!()
         .args(&["-w", "-0.000e-2", "1"])
         .succeeds()
-        .stdout_is("-0.00000\n01.00000\n")
-        .no_stderr();
+        .stdout_only("-0.00000\n01.00000\n");
     new_ucmd!()
         .args(&["-w", "-0.000e-2", "1", "2"])
         .succeeds()
-        .stdout_is("-0.00000\n01.00000\n02.00000\n")
-        .no_stderr();
+        .stdout_only("-0.00000\n01.00000\n02.00000\n");
     new_ucmd!()
         .args(&["-w", "-0.000e-2", "1", "2.0"])
         .succeeds()
-        .stdout_is("-0.00000\n01.00000\n02.00000\n")
-        .no_stderr();
+        .stdout_only("-0.00000\n01.00000\n02.00000\n");
 
     new_ucmd!()
         .args(&["-w", "-0.000e5", "1"])
         .succeeds()
-        .stdout_is("-000000\n0000001\n")
-        .no_stderr();
+        .stdout_only("-000000\n0000001\n");
     new_ucmd!()
         .args(&["-w", "-0.000e5", "1", "2"])
         .succeeds()
-        .stdout_is("-000000\n0000001\n0000002\n")
-        .no_stderr();
+        .stdout_only("-000000\n0000001\n0000002\n");
     new_ucmd!()
         .args(&["-w", "-0.000e5", "1", "2.0"])
         .succeeds()
-        .stdout_is("-000000\n0000001\n0000002\n")
-        .no_stderr();
+        .stdout_only("-000000\n0000001\n0000002\n");
 
     new_ucmd!()
         .args(&["-w", "-0.000e5", "1"])
         .succeeds()
-        .stdout_is("-000000\n0000001\n")
-        .no_stderr();
+        .stdout_only("-000000\n0000001\n");
     new_ucmd!()
         .args(&["-w", "-0.000e5", "1", "2"])
         .succeeds()
-        .stdout_is("-000000\n0000001\n0000002\n")
-        .no_stderr();
+        .stdout_only("-000000\n0000001\n0000002\n");
     new_ucmd!()
         .args(&["-w", "-0.000e5", "1", "2.0"])
         .succeeds()
-        .stdout_is("-000000\n0000001\n0000002\n")
-        .no_stderr();
+        .stdout_only("-000000\n0000001\n0000002\n");
 }
 
 #[test]
@@ -497,14 +464,12 @@ fn test_width_decimal_scientific_notation_increment() {
     new_ucmd!()
         .args(&["-w", ".1", "1e-2", ".11"])
         .succeeds()
-        .stdout_is("0.10\n0.11\n")
-        .no_stderr();
+        .stdout_only("0.10\n0.11\n");
 
     new_ucmd!()
         .args(&["-w", ".0", "1.500e-1", ".2"])
         .succeeds()
-        .stdout_is("0.0000\n0.1500\n")
-        .no_stderr();
+        .stdout_only("0.0000\n0.1500\n");
 }
 
 /// Test that trailing zeros in the start argument contribute to precision.
@@ -513,8 +478,7 @@ fn test_width_decimal_scientific_notation_trailing_zeros_start() {
     new_ucmd!()
         .args(&["-w", ".1000", "1e-2", ".11"])
         .succeeds()
-        .stdout_is("0.1000\n0.1100\n")
-        .no_stderr();
+        .stdout_only("0.1000\n0.1100\n");
 }
 
 /// Test that trailing zeros in the increment argument contribute to precision.
@@ -523,8 +487,7 @@ fn test_width_decimal_scientific_notation_trailing_zeros_increment() {
     new_ucmd!()
         .args(&["-w", "1e-1", "0.0100", ".11"])
         .succeeds()
-        .stdout_is("0.1000\n0.1100\n")
-        .no_stderr();
+        .stdout_only("0.1000\n0.1100\n");
 }
 
 #[test]
@@ -532,8 +495,7 @@ fn test_width_negative_decimal_notation() {
     new_ucmd!()
         .args(&["-w", "-.1", ".1", ".11"])
         .succeeds()
-        .stdout_is("-0.1\n00.0\n00.1\n")
-        .no_stderr();
+        .stdout_only("-0.1\n00.0\n00.1\n");
 }
 
 #[test]
@@ -541,22 +503,19 @@ fn test_width_negative_scientific_notation() {
     new_ucmd!()
         .args(&["-w", "-1e-3", "1"])
         .succeeds()
-        .stdout_is("-0.001\n00.999\n")
-        .no_stderr();
+        .stdout_only("-0.001\n00.999\n");
     new_ucmd!()
         .args(&["-w", "-1.e-3", "1"])
         .succeeds()
-        .stdout_is("-0.001\n00.999\n")
-        .no_stderr();
+        .stdout_only("-0.001\n00.999\n");
     new_ucmd!()
         .args(&["-w", "-1.0e-4", "1"])
         .succeeds()
-        .stdout_is("-0.00010\n00.99990\n")
-        .no_stderr();
+        .stdout_only("-0.00010\n00.99990\n");
     new_ucmd!()
         .args(&["-w", "-.1e2", "10", "100"])
         .succeeds()
-        .stdout_is(
+        .stdout_only(
             "-010
 0000
 0010
@@ -570,12 +529,11 @@ fn test_width_negative_scientific_notation() {
 0090
 0100
 ",
-        )
-        .no_stderr();
+        );
     new_ucmd!()
         .args(&["-w", "-0.1e2", "10", "100"])
         .succeeds()
-        .stdout_is(
+        .stdout_only(
             "-010
 0000
 0010
@@ -589,8 +547,7 @@ fn test_width_negative_scientific_notation() {
 0090
 0100
 ",
-        )
-        .no_stderr();
+        );
 }
 
 /// Test that trailing zeros in the end argument do not contribute to width.
@@ -599,8 +556,7 @@ fn test_width_decimal_scientific_notation_trailing_zeros_end() {
     new_ucmd!()
         .args(&["-w", "1e-1", "1e-2", ".1100"])
         .succeeds()
-        .stdout_is("0.10\n0.11\n")
-        .no_stderr();
+        .stdout_only("0.10\n0.11\n");
 }
 
 #[test]
@@ -608,8 +564,7 @@ fn test_width_floats() {
     new_ucmd!()
         .args(&["-w", "9.0", "10.0"])
         .succeeds()
-        .stdout_is("09.0\n10.0\n")
-        .no_stderr();
+        .stdout_only("09.0\n10.0\n");
 }
 
 // TODO This is duplicated from `test_yes.rs`; refactor them.
@@ -661,11 +616,7 @@ fn test_neg_inf_width() {
 
 #[test]
 fn test_ignore_leading_whitespace() {
-    new_ucmd!()
-        .arg("   1")
-        .succeeds()
-        .stdout_is("1\n")
-        .no_stderr();
+    new_ucmd!().arg("   1").succeeds().stdout_only("1\n");
 }
 
 #[test]
@@ -684,8 +635,7 @@ fn test_negative_zero_int_start_float_increment() {
     new_ucmd!()
         .args(&["-0", "0.1", "0.1"])
         .succeeds()
-        .stdout_is("-0.0\n0.1\n")
-        .no_stderr();
+        .stdout_only("-0.0\n0.1\n");
 }
 
 #[test]
@@ -693,7 +643,7 @@ fn test_float_precision_increment() {
     new_ucmd!()
         .args(&["999", "0.1", "1000.1"])
         .succeeds()
-        .stdout_is(
+        .stdout_only(
             "999.0
 999.1
 999.2
@@ -707,8 +657,7 @@ fn test_float_precision_increment() {
 1000.0
 1000.1
 ",
-        )
-        .no_stderr();
+        );
 }
 
 /// Test for floating point precision issues.
@@ -717,8 +666,7 @@ fn test_negative_increment_decimal() {
     new_ucmd!()
         .args(&["0.1", "-0.1", "-0.2"])
         .succeeds()
-        .stdout_is("0.1\n0.0\n-0.1\n-0.2\n")
-        .no_stderr();
+        .stdout_only("0.1\n0.0\n-0.1\n-0.2\n");
 }
 
 #[test]
@@ -726,8 +674,7 @@ fn test_zero_not_first() {
     new_ucmd!()
         .args(&["-w", "-0.1", "0.1", "0.1"])
         .succeeds()
-        .stdout_is("-0.1\n00.0\n00.1\n")
-        .no_stderr();
+        .stdout_only("-0.1\n00.0\n00.1\n");
 }
 
 #[test]
@@ -735,8 +682,7 @@ fn test_rounding_end() {
     new_ucmd!()
         .args(&["1", "-1", "0.1"])
         .succeeds()
-        .stdout_is("1\n")
-        .no_stderr();
+        .stdout_only("1\n");
 }
 
 #[test]