diff --git a/js/test/unit/generated-data-tests.ts b/js/test/unit/generated-data-tests.ts
index 948b7af7065..90cf0d598aa 100644
--- a/js/test/unit/generated-data-tests.ts
+++ b/js/test/unit/generated-data-tests.ts
@@ -54,7 +54,7 @@ describe('Generated Test Data', () => {
     describe('List', () => { validateVector(generate.list()); });
     describe('Struct', () => { validateVector(generate.struct()); });
     describe('DenseUnion', () => { validateVector(generate.denseUnion()); });
-    // describe('SparseUnion', () => { validateVector(generate.sparseUnion()); });
+    describe('SparseUnion', () => { validateVector(generate.sparseUnion()); });
     describe('Dictionary', () => { validateVector(generate.dictionary()); });
     describe('IntervalDayTime', () => { validateVector(generate.intervalDayTime()); });
     describe('IntervalYearMonth', () => { validateVector(generate.intervalYearMonth()); });