hard code the test data location to the correct place

diff --git a/src/hosts.rs b/src/hosts.rs
index 59cfc02..17a59f3 100644
--- a/src/hosts.rs
+++ b/src/hosts.rs
@@ -191,7 +191,7 @@ mod tests {
 
     #[test]
     fn test_read_hosts_conf() {
-        let path = format!("{}/hosts", tests_dir());
+        let path = "tests/hosts";
         let hosts = read_hosts_conf(path).unwrap();
 
         let name = Name::from_str("localhost").unwrap();
diff --git a/src/system_conf/unix.rs b/src/system_conf/unix.rs
index 4439309..31d0b7b 100644
--- a/src/system_conf/unix.rs
+++ b/src/system_conf/unix.rs
@@ -221,8 +221,8 @@ mod tests {
 
     #[test]
     fn test_read_resolv_conf() {
-        read_resolv_conf(format!("{}/resolv.conf-simple", tests_dir())).expect("simple failed");
-        read_resolv_conf(format!("{}/resolv.conf-macos", tests_dir())).expect("macos failed");
-        read_resolv_conf(format!("{}/resolv.conf-linux", tests_dir())).expect("linux failed");
+        read_resolv_conf("tests/resolv.conf-simple").expect("simple failed");
+        read_resolv_conf("tests/resolv.conf-macos").expect("macos failed");
+        read_resolv_conf("tests/resolv.conf-linux").expect("linux failed");
     }
 }