refactor tests

Author: HaitaiNg

tests/by-util/test_hostname.rs

@@ -1,20 +1,35 @@
-// This file is part of the uutils hostname package.
-//
-// For the full copyright and license information, please view the LICENSE
-// file that was distributed with this source code.
 use std::env;
+use std::sync::Once;
 
-pub const TESTS_BINARY: &str = env!("CARGO_BIN_EXE_hostname");
+static INIT: Once = Once::new();
 
-// Use the ctor attribute to run this function before any tests
-#[ctor::ctor]
-fn init() {
-    unsafe {
-        // Necessary for uutests to be able to find the binary
-        std::env::set_var("UUTESTS_BINARY_PATH", TESTS_BINARY);
-    }
+fn init_binary_path() {
+    INIT.call_once(|| {
+        if let Ok(binary_path) = env::var("CARGO_BIN_EXE_hostname") {
+            unsafe {
+                env::set_var("UUTESTS_BINARY_PATH", binary_path);
+            }
+        }
+    });
 }
 
+// Call init in each test module that needs it
 #[cfg(feature = "hostname")]
-#[path = "by-util/test_hostname.rs"]
+#[path = "by_util/hostname.rs"]
 mod test_hostname;
+
+#[cfg(feature = "domainname")]
+#[path = "by_util/domainname.rs"]
+mod test_domainname;
+
+#[cfg(feature = "dnsdomainname")]
+#[path = "by_util/domainname.rs"]
+mod test_dnsdomainname;
+
+#[cfg(feature = "nisdomainname")]
+#[path = "by_util/domainname.rs"]
+mod test_nisdomainname;
+
+#[cfg(feature = "ypdomainname")]
+#[path = "by_util/domainname.rs"]
+mod test_ypdomainname;