diff --git a/spark/src/test/scala/org/apache/comet/CometExpressionCoverageSuite.scala b/spark/src/test/scala/org/apache/comet/CometExpressionCoverageSuite.scala
index 5e02722d6..28901bf46 100644
--- a/spark/src/test/scala/org/apache/comet/CometExpressionCoverageSuite.scala
+++ b/spark/src/test/scala/org/apache/comet/CometExpressionCoverageSuite.scala
@@ -87,7 +87,13 @@ class CometExpressionCoverageSuite extends CometTestBase with AdaptiveSparkPlanH
                     CoverageResult("FAILED", Seq((q, "Cannot parse properly"))))
               }
             } else {
-              // Plain example like SELECT cos(0);
+              // Process the simple example like `SELECT cos(0);`
+              //
+              // The execution disables constant folding. This optimization rule precomputes and selects the value as literal
+              // which subsequently leads to false positives
+              //
+              // ConstantFolding is a operator optimization rule in Catalyst that replaces expressions
+              // that can be statically evaluated with their equivalent literal values.
               testSingleLineQuery(
                 "select 'dummy' x",
                 s"${q.dropRight(1)}, x from tbl",
diff --git a/spark/src/test/scala/org/apache/spark/sql/CometTestBase.scala b/spark/src/test/scala/org/apache/spark/sql/CometTestBase.scala
index 135b2f937..77124311e 100644
--- a/spark/src/test/scala/org/apache/spark/sql/CometTestBase.scala
+++ b/spark/src/test/scala/org/apache/spark/sql/CometTestBase.scala
@@ -741,11 +741,6 @@ abstract class CometTestBase
       spark.createDataFrame(data, schema).repartition(1).write.parquet(path)
       readParquetFile(path, Some(schema)) { df => df.createOrReplaceTempView(tableName) }
 
-      // disable constant folding. This optimization rule precompute and select value as literal
-      // which subsequently leads to false positives
-      //
-      // ConstantFolding is a operator optimization rule in Catalyst that replaces expressions
-      // that can be statically evaluated with their equivalent literal values.
       withSQLConf(
         "spark.sql.optimizer.excludedRules" -> excludedOptimizerRules.getOrElse(""),
         "spark.sql.adaptive.optimizer.excludedRules" -> excludedOptimizerRules.getOrElse("")) {