refactor: split compression tests into separate module files as planned

Co-authored-by: aider (openai/andrew/openrouter/qwen/qwen3-coder) <aider@aider.chat>

src/tests/compression/none_tests.rs

@@ -0,0 +1,56 @@
+#[cfg(test)]
+mod tests {
+    use tempfile::tempdir;
+    use std::io::Write;
+    use crate::compression_engine::none::CompressionEngineNone;
+
+    #[test]
+    fn test_compression_engine_none() {
+        let test_data = b"test compression data";
+        
+        // Create a temporary file
+        let dir = tempdir().expect("Failed to create temporary directory");
+        let file_path = dir.path().join("test.dat");
+        
+        // Test compression engine
+        let engine = CompressionEngineNone::new();
+        
+        // Create file
+        {
+            let mut writer = engine.create(file_path.clone()).expect("Failed to create writer");
+            writer.write_all(test_data).expect("Failed to write data");
+        }
+        
+        // Read file
+        let mut reader = engine.open(file_path).expect("Failed to open reader");
+        let mut data = Vec::new();
+        std::io::copy(&mut reader, &mut data).expect("Failed to read data");
+        
+        assert_eq!(test_data, data.as_slice());
+    }
+
+    #[test]
+    fn test_compression_engine_none_empty_data() {
+        let test_data = b"";
+        
+        // Create a temporary file
+        let dir = tempdir().expect("Failed to create temporary directory");
+        let file_path = dir.path().join("test_empty.dat");
+        
+        // Test compression engine
+        let engine = CompressionEngineNone::new();
+        
+        // Create file
+        {
+            let mut writer = engine.create(file_path.clone()).expect("Failed to create writer");
+            writer.write_all(test_data).expect("Failed to write data");
+        }
+        
+        // Read file
+        let mut reader = engine.open(file_path).expect("Failed to open reader");
+        let mut data = Vec::new();
+        std::io::copy(&mut reader, &mut data).expect("Failed to read data");
+        
+        assert_eq!(test_data, data.as_slice());
+    }
+}