chore(tasks): print diff for minify idempotency assertion (#8161)

Made the assertion error output more easier to understand.

Example output:

![image](https://github.com/user-attachments/assets/445910fb-b389-4884-b4c5-70a095bc523f)

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

Cargo.toml

@@ -189,6 +189,7 @@ serde-wasm-bindgen = "0.6.5"
 sha1 = "0.10.6"
 simdutf8 = { version = "0.1.5", features = ["aarch64_neon"] }
 similar = "2.6.0"
+similar-asserts = "1.6.0"
 string_wizard = "0.0.25"
 tempfile = "3.14.0"
 tokio = "1.42.0"

tasks/minsize/Cargo.toml

@@ -29,5 +29,7 @@ oxc_transformer = { workspace = true }
 flate2 = { workspace = true }
 oxc_tasks_common = { workspace = true }
 
+cow-utils = { workspace = true }
 humansize = { workspace = true }
 rustc-hash = { workspace = true }
+similar-asserts = { workspace = true }

tasks/minsize/src/lib.rs

@@ -16,13 +16,29 @@ use oxc_span::SourceType;
 use oxc_tasks_common::{project_root, TestFile, TestFiles};
 use oxc_transformer::{ReplaceGlobalDefines, ReplaceGlobalDefinesConfig};
 use rustc_hash::FxHashMap;
+use similar_asserts::assert_eq;
 
 // #[test]
 // #[cfg(any(coverage, coverage_nightly))]
 // fn test() {
 // run().unwrap();
 // }
 
+macro_rules! assert_eq_minified_code {
+    ($left:expr, $right:expr, $($arg:tt)*) => {
+        if $left != $right {
+            let normalized_left = $crate::normalize_minified_code($left);
+            let normalized_right = $crate::normalize_minified_code($right);
+            assert_eq!(normalized_left, normalized_right, $($arg)*);
+        }
+    };
+}
+
+fn normalize_minified_code(code: &str) -> String {
+    use cow_utils::CowUtils;
+    code.cow_replace(";", ";\n").cow_replace(",", ",\n").into_owned()
+}
+
 /// # Panics
 /// # Errors
 pub fn run() -> Result<(), io::Error> {
@@ -131,7 +147,12 @@ fn minify_twice(file: &TestFile) -> String {
     };
     let source_text1 = minify(&file.source_text, source_type, options);
     let source_text2 = minify(&source_text1, source_type, options);
-    assert_eq!(source_text1, source_text2, "Minification failed for {}", &file.file_name);
+    assert_eq_minified_code!(
+        &source_text1,
+        &source_text2,
+        "Minification failed for {}",
+        &file.file_name
+    );
     source_text2
 }