use tempfiles to not access file multiple times

CHANGES.md

@@ -96,6 +96,10 @@
 
   - <https://github.com/georust/gdal/pull/292>
 
+- Added a workaround in multi-dim tests to not access files multiple times
+
+  - <https://github.com/georust/gdal/pull/302>
+
 ## 0.12
 
 - Bump Rust edition to 2021

src/programs/raster/mdimtranslate.rs

@@ -231,15 +231,55 @@ mod tests {
 
     use crate::{DatasetOptions, Driver, GdalOpenFlags};
 
+    /// Create a copy of the test file in a temporary directory
+    /// and returns a tuple of the temp dir (for clean-up) as well as the path to the file.
+    /// We can remove this when <https://github.com/OSGeo/gdal/issues/6253> is resolved.
+    struct TempDataset {
+        _temp_dir: tempfile::TempDir,
+        temp_path: PathBuf,
+    }
+
+    impl TempDataset {
+        pub fn fixture(name: &str) -> Self {
+            let path = std::path::Path::new(file!())
+                .parent()
+                .unwrap()
+                .parent()
+                .unwrap()
+                .parent()
+                .unwrap()
+                .parent()
+                .unwrap()
+                .join("fixtures")
+                .join(name);
+
+            let temp_dir = tempfile::tempdir().unwrap();
+            let temp_path = temp_dir.path().join(path.file_name().unwrap());
+
+            std::fs::copy(&path, &temp_path).unwrap();
+
+            Self {
+                _temp_dir: temp_dir,
+                temp_path,
+            }
+        }
+
+        pub fn path(&self) -> &Path {
+            &self.temp_path
+        }
+    }
+
     #[test]
     fn test_build_tiff_from_path() {
+        let fixture = TempDataset::fixture("cf_nasa_4326.nc");
+
         let dataset_options = DatasetOptions {
             open_flags: GdalOpenFlags::GDAL_OF_MULTIDIM_RASTER,
             allowed_drivers: None,
             open_options: None,
             sibling_files: None,
         };
-        let dataset = Dataset::open_ex("fixtures/cf_nasa_4326.nc", dataset_options).unwrap();
+        let dataset = Dataset::open_ex(fixture.path(), dataset_options).unwrap();
 
         let mem_file_path = "/vsimem/2d3e9124-a7a0-413e-97b5-e79d46e50ff8";
 
@@ -263,13 +303,15 @@ mod tests {
 
     #[test]
     fn test_build_tiff_from_dataset() {
+        let fixture = TempDataset::fixture("cf_nasa_4326.nc");
+
         let dataset_options = DatasetOptions {
             open_flags: GdalOpenFlags::GDAL_OF_MULTIDIM_RASTER,
             allowed_drivers: None,
             open_options: None,
             sibling_files: None,
         };
-        let dataset = Dataset::open_ex("fixtures/cf_nasa_4326.nc", dataset_options).unwrap();
+        let dataset = Dataset::open_ex(fixture.path(), dataset_options).unwrap();
 
         let driver = Driver::get_by_name("MEM").unwrap();
         let output_dataset = driver.create("", 5, 7, 1).unwrap();