Create the uutest crate + adjust the code

+ move some of the tests into the program test

tests/tests.rs

@@ -2,8 +2,19 @@
 //
 // For the full copyright and license information, please view the LICENSE
 // file that was distributed with this source code.
-#[macro_use]
-mod common;
+
+// Then override the macro with your constant
+use std::env;
+
+pub const TESTS_BINARY: &str = env!("CARGO_BIN_EXE_coreutils");
+
+// Use the ctor attribute to run this function before any tests
+#[ctor::ctor]
+fn init() {
+    unsafe {
+        std::env::set_var("UUTESTS_BINARY_PATH", TESTS_BINARY);
+    }
+}
 
 #[cfg(feature = "arch")]
 #[path = "by-util/test_arch.rs"]