Add test.

sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/codegen/ExprValueSuite.scala

@@ -0,0 +1,41 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql.catalyst.expressions.codegen
+
+import org.apache.spark.SparkFunSuite
+
+class ExprValueSuite extends SparkFunSuite {
+
+  test("TrueLiteral and FalseLiteral should be LiteralValue") {
+    val trueLit = TrueLiteral
+    val falseLit = FalseLiteral
+
+    assert(trueLit.value == "true")
+    assert(falseLit.value == "false")
+
+    trueLit match {
+      case LiteralValue(value) => assert(value == "true")
+      case _ => fail()
+    }
+
+    falseLit match {
+      case LiteralValue(value) => assert(value == "false")
+      case _ => fail()
+    }
+  }
+}