fix(tests): restrict 'cat' tests to unix environments. Fixes #776 (#777)

Tests using the 'cat' command are specific
to unix-like environments and
fail on unsupported platforms.

tests/integration_tests.rs

@@ -3,6 +3,12 @@ use common::hyperfine;
 
 use predicates::prelude::*;
 
+/// Platform-specific I/O utility.
+/// - On Unix-like systems, defaults to `cat`.
+/// - On Windows, uses `findstr` as an alternative.
+///   See: <https://superuser.com/questions/853580/real-windows-equivalent-to-cat-stdin>
+const STDIN_READ_COMMAND: &str = if cfg!(windows) { "findstr x*" } else { "cat" };
+
 pub fn hyperfine_debug() -> assert_cmd::Command {
     let mut cmd = hyperfine();
     cmd.arg("--debug-mode");
@@ -306,7 +312,7 @@ fn can_pass_input_to_command_from_a_file() {
         .arg("--runs=1")
         .arg("--input=example_input_file.txt")
         .arg("--show-output")
-        .arg("cat")
+        .arg(STDIN_READ_COMMAND)
         .assert()
         .success()
         .stdout(predicate::str::contains("This text is part of a file"));
@@ -318,7 +324,7 @@ fn fails_if_invalid_stdin_data_file_provided() {
         .arg("--runs=1")
         .arg("--input=example_non_existent_file.txt")
         .arg("--show-output")
-        .arg("cat")
+        .arg(STDIN_READ_COMMAND)
         .assert()
         .failure()
         .stderr(predicate::str::contains(