diff --git a/tasks/prettier_conformance/src/lib.rs b/tasks/prettier_conformance/src/lib.rs
index bbb2897cdbaac..b7d9188eb4049 100644
--- a/tasks/prettier_conformance/src/lib.rs
+++ b/tasks/prettier_conformance/src/lib.rs
@@ -157,6 +157,11 @@ impl TestRunner {
                 .collect();
 
             self.spec.parse(&spec_path);
+            debug_assert!(
+                !self.spec.calls.is_empty(),
+                "There is no `runFormatTest()` in {}, please check if it is correct?",
+                spec_path.to_string_lossy()
+            );
             total += inputs.len();
             inputs.sort_unstable();
             self.test_snapshot(dir, &spec_path, &inputs, &mut failed);
@@ -201,7 +206,7 @@ impl TestRunner {
                 expected.contains(&snapshot)
             });
 
-            if !result {
+            if self.spec.calls.is_empty() || !result {
                 let mut dir_info = String::new();
                 if write_dir_info {
                     dir_info.push_str(
diff --git a/tasks/prettier_conformance/src/spec.rs b/tasks/prettier_conformance/src/spec.rs
index b201c5728bb08..ccc9065993628 100644
--- a/tasks/prettier_conformance/src/spec.rs
+++ b/tasks/prettier_conformance/src/spec.rs
@@ -32,6 +32,9 @@ impl SpecParser {
 impl VisitMut<'_> for SpecParser {
     fn visit_call_expression(&mut self, expr: &mut CallExpression<'_>) {
         let Some(ident) = expr.callee.get_identifier_reference() else { return };
+        // The `runFormatTest` function used on prettier's test cases. We need to collect all `run_spec` calls
+        // And then parse the arguments to get the options and parsers
+        // Finally we use this information to generate the snapshot tests
         if ident.name != "runFormatTest" {
             return;
         }