MDEV-4869 Wrong result of MAKETIME(0, 0, -0.1)

Adding a test case only.

The problem was fixed by:

  MDEV-4724 Some temporal functions do not preserve microseconds

modified:
  mysql-test/r/func_time.result
  mysql-test/t/func_time.test

mysql-test/r/func_time.result

@@ -2241,3 +2241,9 @@ SELECT * FROM t1;
 TIMESTAMP('00:00:00','10:10:10')	TIMESTAMP(TIME('00:00:00'),'10:10:10')
 NULL	NULL
 DROP TABLE t1;
+#
+# MDEV-4869 Wrong result of MAKETIME(0, 0, -0.1)
+#
+SELECT MAKETIME(0, 0, -0.1);
+MAKETIME(0, 0, -0.1)
+NULL

mysql-test/t/func_time.test

@@ -1357,3 +1357,9 @@ CREATE TABLE t1 AS SELECT
 SHOW COLUMNS FROM t1;
 SELECT * FROM t1;
 DROP TABLE t1;
+
+--echo #
+--echo # MDEV-4869 Wrong result of MAKETIME(0, 0, -0.1)
+--echo #
+SELECT MAKETIME(0, 0, -0.1);
+