Test for MDEV-11874 "Data too long for column" instead of "Invalid default value for" upon ALTER in strict mode

This problem was earlier fixed by the patch for:
    MDEV-16421 Make system tables crash safe

Adding tests only.

Author: abarkov

mysql-test/main/type_varchar.result

@@ -686,3 +686,40 @@ DROP TABLE t1,t2;
 #
 # End of 10.0 tests
 #
+#
+# Start of 10.4 tests
+#
+SET sql_mode='';
+CREATE TABLE t1 (c VARCHAR(1) DEFAULT 'foo');
+ERROR 42000: Invalid default value for 'c'
+SHOW WARNINGS;
+Level	Code	Message
+Warning	1265	Data truncated for column 'c' at row 1
+Error	1067	Invalid default value for 'c'
+SET sql_mode='STRICT_ALL_TABLES';
+CREATE TABLE t1 (c VARCHAR(1) DEFAULT 'foo');
+ERROR 42000: Invalid default value for 'c'
+SHOW WARNINGS;
+Level	Code	Message
+Warning	1265	Data truncated for column 'c' at row 1
+Error	1067	Invalid default value for 'c'
+CREATE TABLE t1 (c VARCHAR(1));
+SET sql_mode='';
+ALTER TABLE t1 ALTER column c SET DEFAULT 'foo';
+ERROR 42000: Invalid default value for 'c'
+SHOW WARNINGS;
+Level	Code	Message
+Warning	1265	Data truncated for column 'c' at row 1
+Error	1067	Invalid default value for 'c'
+SET sql_mode='STRICT_ALL_TABLES';
+ALTER TABLE t1 ALTER column c SET DEFAULT 'foo';
+ERROR 42000: Invalid default value for 'c'
+SHOW WARNINGS;
+Level	Code	Message
+Warning	1265	Data truncated for column 'c' at row 1
+Error	1067	Invalid default value for 'c'
+DROP TABLE t1;
+SET sql_mode=DEFAULT;
+#
+# End of 10.4 tests
+#

mysql-test/main/type_varchar.test

@@ -328,3 +328,34 @@ DROP TABLE t1,t2;
 --echo #
 --echo # End of 10.0 tests
 --echo #
+
+
+--echo #
+--echo # Start of 10.4 tests
+--echo #
+
+SET sql_mode='';
+--error ER_INVALID_DEFAULT
+CREATE TABLE t1 (c VARCHAR(1) DEFAULT 'foo');
+SHOW WARNINGS;
+
+SET sql_mode='STRICT_ALL_TABLES';
+--error ER_INVALID_DEFAULT
+CREATE TABLE t1 (c VARCHAR(1) DEFAULT 'foo');
+SHOW WARNINGS;
+
+CREATE TABLE t1 (c VARCHAR(1));
+SET sql_mode='';
+--error ER_INVALID_DEFAULT
+ALTER TABLE t1 ALTER column c SET DEFAULT 'foo';
+SHOW WARNINGS;
+SET sql_mode='STRICT_ALL_TABLES';
+--error ER_INVALID_DEFAULT
+ALTER TABLE t1 ALTER column c SET DEFAULT 'foo';
+SHOW WARNINGS;
+DROP TABLE t1;
+SET sql_mode=DEFAULT;
+
+--echo #
+--echo # End of 10.4 tests
+--echo #