tests: revert setting the default dir but provide a macro to get fixtures directory

Author: Mingshen Sun

tests/macros.rs

@@ -91,15 +91,20 @@ macro_rules! util_name {
 
 #[macro_export]
 macro_rules! new_cli {
-    () => {{
-        use std::env;
-        let mut fixture_path = env::current_dir().unwrap();
-        fixture_path.push("tests");
-        fixture_path.push("fixtures");
-        fixture_path.push(util_name!());
+    () => {
         assert_cli::Assert::main_binary()
             .with_args(&[util_name!()])
-            .current_dir(fixture_path)
+    };
+}
+
+#[macro_export]
+macro_rules! fixtures_path {
+    () => {{
+        use std::env;
+        let mut path = env::current_dir().unwrap();
+        path.push("tests/fixtures");
+        path.push(util_name!());
+        path
     }};
 }
 

tests/posix/test_cat.rs

@@ -36,6 +36,7 @@ use assert_cli;
 #[test]
 fn test_output_multi_files_print_all_chars() {
     new_cli!()
+        .current_dir(fixtures_path!())
         .with_args(&["alpha.txt", "256.txt", "-A", "-n"])
         .succeeds()
         .and()
@@ -57,6 +58,7 @@ fn test_output_multi_files_print_all_chars() {
 #[test]
 fn test_numbered_lines_no_trailing_newline() {
     new_cli!()
+        .current_dir(fixtures_path!())
         .with_args(&["nonewline.txt", "alpha.txt", "-n"])
         .succeeds()
         .and()