saving result file for easy compare in testing

.gitignore

@@ -3,3 +3,5 @@
 /web/dist
 /web/node_modules
 /web/wasm
+
+tests/fixtures/*.oas.json

tests/integration_tests.rs

@@ -1,14 +1,35 @@
+use std::fs::File;
+use std::io::prelude::*;
+
+
 macro_rules! test_fixture {
     ($name:ident, $filename:expr) => {
         #[test]
         fn $name() {
             let filename = get_fixture($filename);
-            let options = postman2openapi::TranspileOptions {
-                format: postman2openapi::TargetFormat::Json,
-            };
+                let options = postman2openapi::TranspileOptions {
+                    format: postman2openapi::TargetFormat::Json,
+                };
             match postman2openapi::from_path(&filename, options) {
-                Ok(_oas) => assert!(true),
-                Err(err) => assert!(false, "{:?}", err),
+                Ok(_oas) => {
+                   // Specify the target file path convert filename to filename_oas.json
+                   let file_path = filename.replace("postman.json", "oas.json");
+
+                    // Remove file if it exists
+                    std::fs::remove_file(file_path.clone()).unwrap_or_default();
+
+                    // Open or create the file
+                    let mut file = File::create(file_path).expect("Failed to create file");
+
+                    // Write data to the file
+                    match file.write_all(_oas.as_bytes()) {
+                        Ok(_) => assert!(true),
+                        Err(err) => assert!(false, "{:?}", err),
+                    }
+                },
+                Err(err) => {
+                    assert!(false, "{:?}", err);
+                },
             }
         }
     };