Switch to --shell=none/-N, do not change the default

tests/integration_tests.rs

@@ -1,5 +1,5 @@
 mod common;
-use common::{hyperfine, hyperfine_shell};
+use common::hyperfine;
 
 use predicates::prelude::*;
 
@@ -86,19 +86,20 @@ fn fails_for_unknown_command() {
         .assert()
         .failure()
         .stderr(predicate::str::contains(
-            "Failed to run command 'some-nonexisting-program-b5d9574198b7e4b12a71fa4747c0a577'",
+            "Command terminated with non-zero exit code",
         ));
 }
 
 #[test]
-fn fails_for_unknown_shell_command() {
-    hyperfine_shell()
+fn fails_for_unknown_command_without_shell() {
+    hyperfine()
+        .arg("--shell=none")
         .arg("--runs=1")
         .arg("some-nonexisting-program-b5d9574198b7e4b12a71fa4747c0a577")
         .assert()
         .failure()
         .stderr(predicate::str::contains(
-            "Command terminated with non-zero exit code",
+            "Failed to run command 'some-nonexisting-program-b5d9574198b7e4b12a71fa4747c0a577'",
         ));
 }