bzip2.rs: improve test coverage

bzip2.rs

@@ -1513,12 +1513,13 @@ unsafe fn uncompress(name: Option<String>) {
             outStr = stdout;
             if inStr.is_null() {
                 eprintln!(
-                    "{}: Can't open input file {}:{}.",
+                    "{}: Can't open input file {}: {}.",
                     get_program_name().display(),
                     in_name.display(),
                     display_last_os_error(),
                 );
                 if !inStr.is_null() {
+                    // this is unreachable, but in the original C source code
                     fclose(inStr);
                 }
                 setExit(1);

tests/quick.rs

@@ -632,7 +632,7 @@ mod decompress_command {
 
     #[cfg(unix)]
     #[test]
-    fn decompress_input_file_cannot_be_read() {
+    fn input_file_cannot_be_read_f2f() {
         use std::os::unix::fs::PermissionsExt;
 
         let tmpdir = tempfile::tempdir().unwrap();
@@ -761,6 +761,30 @@ mod decompress_command {
             ),
         );
     }
+
+    #[test]
+    fn input_file_cannot_be_read_f2o() {
+        use std::os::unix::fs::PermissionsExt;
+
+        let tmpdir = tempfile::tempdir().unwrap();
+        let sample1 = tmpdir.path().join("sample1.bz2");
+
+        std::fs::copy("tests/input/quick/sample1.bz2", &sample1).unwrap();
+
+        let mut permissions = std::fs::metadata(&sample1).unwrap().permissions();
+        permissions.set_mode(0o000); // no permissions for you
+        std::fs::set_permissions(&sample1, permissions).unwrap();
+
+        let mut cmd = command();
+
+        expect_failure!(
+            cmd.arg("-d").arg(&sample1).arg("-c").stdout(Stdio::piped()),
+            format!(
+                "bzip2: Can't open input file {in_file}: Permission denied.\n",
+                in_file = sample1.display()
+            )
+        );
+    }
 }
 
 mod test_command {